drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Meson AXG MIPI DPHY driver
  *
  * Copyright (C) 2018 Amlogic, Inc. All rights reserved
  * Copyright (C) 2020 BayLibre, SAS
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  */

 #include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/bits.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>

 /* [31] soft reset for the phy.
  *		1: reset. 0: dessert the reset.
  * [30] clock lane soft reset.
  * [29] data byte lane 3 soft reset.
  * [28] data byte lane 2 soft reset.
  * [27] data byte lane 1 soft reset.
  * [26] data byte lane 0 soft reset.
  * [25] mipi dsi pll clock selection.
  *		1:  clock from fixed 850Mhz clock source. 0: from VID2 PLL.
  * [12] mipi HSbyteclk enable.
  * [11] mipi divider clk selection.
  *		1: select the mipi DDRCLKHS from clock divider.
  *		0: from PLL clock.
  * [10] mipi clock divider control.
  *		1: /4. 0: /2.
  * [9]  mipi divider output enable.
  * [8]  mipi divider counter enable.
  * [7]  PLL clock enable.
  * [5]  LPDT data endian.
  *		1 = transfer the high bit first. 0 : transfer the low bit first.
  * [4]  HS data endian.
  * [3]  force data byte lane in stop mode.
  * [2]  force data byte lane 0 in receiver mode.
  * [1]  write 1 to sync the txclkesc input. the internal logic have to
  *	use txclkesc to decide Txvalid and Txready.
  * [0]  enalbe the MIPI DPHY TxDDRClk.
  */
 #define MIPI_DSI_PHY_CTRL				0x0

 /* [31] clk lane tx_hs_en control selection.
  *		1: from register. 0: use clk lane state machine.
  * [30] register bit for clock lane tx_hs_en.
  * [29] clk lane tx_lp_en contrl selection.
  *		1: from register. 0: from clk lane state machine.
  * [28] register bit for clock lane tx_lp_en.
  * [27] chan0 tx_hs_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [26] register bit for chan0 tx_hs_en.
  * [25] chan0 tx_lp_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [24] register bit from chan0 tx_lp_en.
  * [23] chan0 rx_lp_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [22] register bit from chan0 rx_lp_en.
  * [21] chan0 contention detection enable control selection.
  *		1: from register. 0: from chan0 state machine.
  * [20] register bit from chan0 contention dectection enable.
  * [19] chan1 tx_hs_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [18] register bit for chan1 tx_hs_en.
  * [17] chan1 tx_lp_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [16] register bit from chan1 tx_lp_en.
  * [15] chan2 tx_hs_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [14] register bit for chan2 tx_hs_en.
  * [13] chan2 tx_lp_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [12] register bit from chan2 tx_lp_en.
  * [11] chan3 tx_hs_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [10] register bit for chan3 tx_hs_en.
  * [9]  chan3 tx_lp_en control selection.
  *		1: from register. 0: from chan0 state machine.
  * [8]  register bit from chan3 tx_lp_en.
  * [4]  clk chan power down. this bit is also used as the power down
  *	of the whole MIPI_DSI_PHY.
  * [3]  chan3 power down.
  * [2]  chan2 power down.
  * [1]  chan1 power down.
  * [0]  chan0 power down.
  */
 #define MIPI_DSI_CHAN_CTRL				0x4

 /* [24]   rx turn watch dog triggered.
  * [23]   rx esc watchdog  triggered.
  * [22]   mbias ready.
  * [21]   txclkesc  synced and ready.
  * [20:17] clk lane state. {mbias_ready, tx_stop, tx_ulps, tx_hs_active}
  * [16:13] chan3 state{0, tx_stop, tx_ulps, tx_hs_active}
  * [12:9]  chan2 state.{0, tx_stop, tx_ulps, tx_hs_active}
  * [8:5]   chan1 state. {0, tx_stop, tx_ulps, tx_hs_active}
  * [4:0]   chan0 state. {TX_STOP, tx_ULPS, hs_active, direction, rxulpsesc}
  */
 #define MIPI_DSI_CHAN_STS				0x8

 /* [31:24] TCLK_PREPARE.
  * [23:16] TCLK_ZERO.
  * [15:8]  TCLK_POST.
  * [7:0]   TCLK_TRAIL.
  */
 #define MIPI_DSI_CLK_TIM				0xc

 /* [31:24] THS_PREPARE.
  * [23:16] THS_ZERO.
  * [15:8]  THS_TRAIL.
  * [7:0]   THS_EXIT.
  */
 #define MIPI_DSI_HS_TIM					0x10

 /* [31:24] tTA_GET.
  * [23:16] tTA_GO.
  * [15:8]  tTA_SURE.
  * [7:0]   tLPX.
  */
 #define MIPI_DSI_LP_TIM					0x14

 /* wait time to  MIPI DIS analog ready. */
 #define MIPI_DSI_ANA_UP_TIM				0x18

 /* TINIT. */
 #define MIPI_DSI_INIT_TIM				0x1c

 /* TWAKEUP. */
 #define MIPI_DSI_WAKEUP_TIM				0x20

 /* when in RxULPS check state, after the the logic enable the analog,
  *	how long we should wait to check the lP state .
  */
 #define MIPI_DSI_LPOK_TIM				0x24

 /* Watchdog for RX low power state no finished. */
 #define MIPI_DSI_LP_WCHDOG				0x28

 /* tMBIAS,  after send power up signals to analog,
  *	how long we should wait for analog powered up.
  */
 #define MIPI_DSI_ANA_CTRL				0x2c

 /* [31:8]  reserved for future.
  * [7:0]   tCLK_PRE.
  */
 #define MIPI_DSI_CLK_TIM1				0x30

 /* watchdog for turn around waiting time. */
 #define MIPI_DSI_TURN_WCHDOG				0x34

 /* When in RxULPS state, how frequency we should to check
  *	if the TX side out of ULPS state.
  */
 #define MIPI_DSI_ULPS_CHECK				0x38
 #define MIPI_DSI_TEST_CTRL0				0x3c
 #define MIPI_DSI_TEST_CTRL1				0x40

 struct phy_meson_axg_mipi_dphy_priv {
 	struct device				*dev;
 	struct regmap				*regmap;
 	struct clk				*clk;
 	struct reset_control			*reset;
 	struct phy				*analog;
 	struct phy_configure_opts_mipi_dphy	config;
 };

 static const struct regmap_config phy_meson_axg_mipi_dphy_regmap_conf = {
 	.reg_bits = 8,
 	.val_bits = 32,
 	.reg_stride = 4,
 	.max_register = MIPI_DSI_TEST_CTRL1,
 };

 static int phy_meson_axg_mipi_dphy_init(struct phy *phy)
 {
 	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 	int ret;

 	ret = phy_init(priv->analog);
 	if (ret)
 		return ret;

 	ret = reset_control_reset(priv->reset);
 	if (ret)
 		return ret;

 	return 0;
 }

 static int phy_meson_axg_mipi_dphy_configure(struct phy *phy,
 					      union phy_configure_opts *opts)
 {
 	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 	int ret;

 	ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
 	if (ret)
 		return ret;

 	ret = phy_configure(priv->analog, opts);
 	if (ret)
 		return ret;

 	memcpy(&priv->config, opts, sizeof(priv->config));

 	return 0;
 }

 static int phy_meson_axg_mipi_dphy_power_on(struct phy *phy)
 {
 	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 	int ret;
 	unsigned long temp;

 	ret = phy_power_on(priv->analog);
 	if (ret)
 		return ret;

 	/* enable phy clock */
 	regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL,  0x1);
 	regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL,
 		     BIT(0) | /* enable the DSI PLL clock . */
 		     BIT(7) | /* enable pll clock which connected to DDR clock path */
 		     BIT(8)); /* enable the clock divider counter */

 	/* enable the divider clock out */
 	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(9), BIT(9));

 	/* enable the byte clock generation. */
 	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(12), BIT(12));
 	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), BIT(31));
 	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), 0);

 	/* Calculate lanebyteclk period in ps */
 	temp = (1000000 * 100) / (priv->config.hs_clk_rate / 1000);
 	temp = temp * 8 * 10;

 	regmap_write(priv->regmap, MIPI_DSI_CLK_TIM,
 		     DIV_ROUND_UP(priv->config.clk_trail, temp) |
 		     (DIV_ROUND_UP(priv->config.clk_post +
 				   priv->config.hs_trail, temp) << 8) |
 		     (DIV_ROUND_UP(priv->config.clk_zero, temp) << 16) |
 		     (DIV_ROUND_UP(priv->config.clk_prepare, temp) << 24));
 	regmap_write(priv->regmap, MIPI_DSI_CLK_TIM1,
 		     DIV_ROUND_UP(priv->config.clk_pre, BITS_PER_BYTE));

 	regmap_write(priv->regmap, MIPI_DSI_HS_TIM,
 		     DIV_ROUND_UP(priv->config.hs_exit, temp) |
 		     (DIV_ROUND_UP(priv->config.hs_trail, temp) << 8) |
 		     (DIV_ROUND_UP(priv->config.hs_zero, temp) << 16) |
 		     (DIV_ROUND_UP(priv->config.hs_prepare, temp) << 24));

 	regmap_write(priv->regmap, MIPI_DSI_LP_TIM,
 		     DIV_ROUND_UP(priv->config.lpx, temp) |
 		     (DIV_ROUND_UP(priv->config.ta_sure, temp) << 8) |
 		     (DIV_ROUND_UP(priv->config.ta_go, temp) << 16) |
 		     (DIV_ROUND_UP(priv->config.ta_get, temp) << 24));

 	regmap_write(priv->regmap, MIPI_DSI_ANA_UP_TIM, 0x0100);
 	regmap_write(priv->regmap, MIPI_DSI_INIT_TIM,
 		     DIV_ROUND_UP(priv->config.init * NSEC_PER_MSEC, temp));
 	regmap_write(priv->regmap, MIPI_DSI_WAKEUP_TIM,
 		     DIV_ROUND_UP(priv->config.wakeup * NSEC_PER_MSEC, temp));
 	regmap_write(priv->regmap, MIPI_DSI_LPOK_TIM, 0x7C);
 	regmap_write(priv->regmap, MIPI_DSI_ULPS_CHECK, 0x927C);
 	regmap_write(priv->regmap, MIPI_DSI_LP_WCHDOG, 0x1000);
 	regmap_write(priv->regmap, MIPI_DSI_TURN_WCHDOG, 0x1000);

 	/* Powerup the analog circuit */
 	switch (priv->config.lanes) {
 	case 1:
 		regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xe);
 		break;
 	case 2:
 		regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xc);
 		break;
 	case 3:
 		regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0x8);
 		break;
 	case 4:
 	default:
 		regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0);
 		break;
 	}

 	/* Trigger a sync active for esc_clk */
 	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(1), BIT(1));

 	return 0;
 }

 static int phy_meson_axg_mipi_dphy_power_off(struct phy *phy)
 {
 	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);

 	regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xf);
 	regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31));

 	phy_power_off(priv->analog);

 	return 0;
 }

 static int phy_meson_axg_mipi_dphy_exit(struct phy *phy)
 {
 	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
 	int ret;

 	ret = phy_exit(priv->analog);
 	if (ret)
 		return ret;

 	return reset_control_reset(priv->reset);
 }

 static const struct phy_ops phy_meson_axg_mipi_dphy_ops = {
 	.configure	= phy_meson_axg_mipi_dphy_configure,
 	.init		= phy_meson_axg_mipi_dphy_init,
 	.exit		= phy_meson_axg_mipi_dphy_exit,
 	.power_on	= phy_meson_axg_mipi_dphy_power_on,
 	.power_off	= phy_meson_axg_mipi_dphy_power_off,
 	.owner		= THIS_MODULE,
 };

 static int phy_meson_axg_mipi_dphy_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct phy_provider *phy_provider;
 	struct resource *res;
 	struct phy_meson_axg_mipi_dphy_priv *priv;
 	struct phy *phy;
 	void __iomem *base;
 	int ret;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->dev = dev;
 	platform_set_drvdata(pdev, priv);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	priv->regmap = devm_regmap_init_mmio(dev, base,
 					&phy_meson_axg_mipi_dphy_regmap_conf);
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);

 	priv->clk = devm_clk_get(dev, "pclk");
 	if (IS_ERR(priv->clk))
 		return PTR_ERR(priv->clk);

 	priv->reset = devm_reset_control_get(dev, "phy");
 	if (IS_ERR(priv->reset))
 		return PTR_ERR(priv->reset);

 	priv->analog = devm_phy_get(dev, "analog");
 	if (IS_ERR(priv->analog))
 		return PTR_ERR(priv->analog);

 	ret = clk_prepare_enable(priv->clk);
 	if (ret)
 		return ret;

 	ret = reset_control_deassert(priv->reset);
 	if (ret)
 		return ret;

 	phy = devm_phy_create(dev, NULL, &phy_meson_axg_mipi_dphy_ops);
 	if (IS_ERR(phy)) {
 		ret = PTR_ERR(phy);
 		if (ret != -EPROBE_DEFER)
 			dev_err(dev, "failed to create PHY\n");

 		return ret;
 	}

 	phy_set_drvdata(phy, priv);

 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

 	return PTR_ERR_OR_ZERO(phy_provider);
 }

 static const struct of_device_id phy_meson_axg_mipi_dphy_of_match[] = {
 	{ .compatible = "amlogic,axg-mipi-dphy", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, phy_meson_axg_mipi_dphy_of_match);

 static struct platform_driver phy_meson_axg_mipi_dphy_driver = {
 	.probe	= phy_meson_axg_mipi_dphy_probe,
 	.driver	= {
 		.name		= "phy-meson-axg-mipi-dphy",
 		.of_match_table	= phy_meson_axg_mipi_dphy_of_match,
 	},
 };
 module_platform_driver(phy_meson_axg_mipi_dphy_driver);

 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
 MODULE_DESCRIPTION("Meson AXG MIPI DPHY driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Meson AXG MIPI DPHY driver
	*
	* Copyright (C) 2018 Amlogic, Inc. All rights reserved
	* Copyright (C) 2020 BayLibre, SAS
	* Author: Neil Armstrong <narmstrong@baylibre.com>
	*/

	#include <linux/bitfield.h>
	#include <linux/bitops.h>
	#include <linux/bits.h>
	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>
	#include <linux/reset.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>

	/* [31] soft reset for the phy.
	* 1: reset. 0: dessert the reset.
	* [30] clock lane soft reset.
	* [29] data byte lane 3 soft reset.
	* [28] data byte lane 2 soft reset.
	* [27] data byte lane 1 soft reset.
	* [26] data byte lane 0 soft reset.
	* [25] mipi dsi pll clock selection.
	* 1: clock from fixed 850Mhz clock source. 0: from VID2 PLL.
	* [12] mipi HSbyteclk enable.
	* [11] mipi divider clk selection.
	* 1: select the mipi DDRCLKHS from clock divider.
	* 0: from PLL clock.
	* [10] mipi clock divider control.
	* 1: /4. 0: /2.
	* [9] mipi divider output enable.
	* [8] mipi divider counter enable.
	* [7] PLL clock enable.
	* [5] LPDT data endian.
	* 1 = transfer the high bit first. 0 : transfer the low bit first.
	* [4] HS data endian.
	* [3] force data byte lane in stop mode.
	* [2] force data byte lane 0 in receiver mode.
	* [1] write 1 to sync the txclkesc input. the internal logic have to
	* use txclkesc to decide Txvalid and Txready.
	* [0] enalbe the MIPI DPHY TxDDRClk.
	*/
	#define MIPI_DSI_PHY_CTRL 0x0

	/* [31] clk lane tx_hs_en control selection.
	* 1: from register. 0: use clk lane state machine.
	* [30] register bit for clock lane tx_hs_en.
	* [29] clk lane tx_lp_en contrl selection.
	* 1: from register. 0: from clk lane state machine.
	* [28] register bit for clock lane tx_lp_en.
	* [27] chan0 tx_hs_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [26] register bit for chan0 tx_hs_en.
	* [25] chan0 tx_lp_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [24] register bit from chan0 tx_lp_en.
	* [23] chan0 rx_lp_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [22] register bit from chan0 rx_lp_en.
	* [21] chan0 contention detection enable control selection.
	* 1: from register. 0: from chan0 state machine.
	* [20] register bit from chan0 contention dectection enable.
	* [19] chan1 tx_hs_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [18] register bit for chan1 tx_hs_en.
	* [17] chan1 tx_lp_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [16] register bit from chan1 tx_lp_en.
	* [15] chan2 tx_hs_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [14] register bit for chan2 tx_hs_en.
	* [13] chan2 tx_lp_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [12] register bit from chan2 tx_lp_en.
	* [11] chan3 tx_hs_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [10] register bit for chan3 tx_hs_en.
	* [9] chan3 tx_lp_en control selection.
	* 1: from register. 0: from chan0 state machine.
	* [8] register bit from chan3 tx_lp_en.
	* [4] clk chan power down. this bit is also used as the power down
	* of the whole MIPI_DSI_PHY.
	* [3] chan3 power down.
	* [2] chan2 power down.
	* [1] chan1 power down.
	* [0] chan0 power down.
	*/
	#define MIPI_DSI_CHAN_CTRL 0x4

	/* [24] rx turn watch dog triggered.
	* [23] rx esc watchdog triggered.
	* [22] mbias ready.
	* [21] txclkesc synced and ready.
	* [20:17] clk lane state. {mbias_ready, tx_stop, tx_ulps, tx_hs_active}
	* [16:13] chan3 state{0, tx_stop, tx_ulps, tx_hs_active}
	* [12:9] chan2 state.{0, tx_stop, tx_ulps, tx_hs_active}
	* [8:5] chan1 state. {0, tx_stop, tx_ulps, tx_hs_active}
	* [4:0] chan0 state. {TX_STOP, tx_ULPS, hs_active, direction, rxulpsesc}
	*/
	#define MIPI_DSI_CHAN_STS 0x8

	/* [31:24] TCLK_PREPARE.
	* [23:16] TCLK_ZERO.
	* [15:8] TCLK_POST.
	* [7:0] TCLK_TRAIL.
	*/
	#define MIPI_DSI_CLK_TIM 0xc

	/* [31:24] THS_PREPARE.
	* [23:16] THS_ZERO.
	* [15:8] THS_TRAIL.
	* [7:0] THS_EXIT.
	*/
	#define MIPI_DSI_HS_TIM 0x10

	/* [31:24] tTA_GET.
	* [23:16] tTA_GO.
	* [15:8] tTA_SURE.
	* [7:0] tLPX.
	*/
	#define MIPI_DSI_LP_TIM 0x14

	/* wait time to MIPI DIS analog ready. */
	#define MIPI_DSI_ANA_UP_TIM 0x18

	/* TINIT. */
	#define MIPI_DSI_INIT_TIM 0x1c

	/* TWAKEUP. */
	#define MIPI_DSI_WAKEUP_TIM 0x20

	/* when in RxULPS check state, after the the logic enable the analog,
	* how long we should wait to check the lP state .
	*/
	#define MIPI_DSI_LPOK_TIM 0x24

	/* Watchdog for RX low power state no finished. */
	#define MIPI_DSI_LP_WCHDOG 0x28

	/* tMBIAS, after send power up signals to analog,
	* how long we should wait for analog powered up.
	*/
	#define MIPI_DSI_ANA_CTRL 0x2c

	/* [31:8] reserved for future.
	* [7:0] tCLK_PRE.
	*/
	#define MIPI_DSI_CLK_TIM1 0x30

	/* watchdog for turn around waiting time. */
	#define MIPI_DSI_TURN_WCHDOG 0x34

	/* When in RxULPS state, how frequency we should to check
	* if the TX side out of ULPS state.
	*/
	#define MIPI_DSI_ULPS_CHECK 0x38
	#define MIPI_DSI_TEST_CTRL0 0x3c
	#define MIPI_DSI_TEST_CTRL1 0x40

	struct phy_meson_axg_mipi_dphy_priv {
	struct device *dev;
	struct regmap *regmap;
	struct clk *clk;
	struct reset_control *reset;
	struct phy *analog;
	struct phy_configure_opts_mipi_dphy config;
	};

	static const struct regmap_config phy_meson_axg_mipi_dphy_regmap_conf = {
	.reg_bits = 8,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = MIPI_DSI_TEST_CTRL1,
	};

	static int phy_meson_axg_mipi_dphy_init(struct phy *phy)
	{
	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
	int ret;

	ret = phy_init(priv->analog);
	if (ret)
	return ret;

	ret = reset_control_reset(priv->reset);
	if (ret)
	return ret;

	return 0;
	}

	static int phy_meson_axg_mipi_dphy_configure(struct phy *phy,
	union phy_configure_opts *opts)
	{
	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
	int ret;

	ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
	if (ret)
	return ret;

	ret = phy_configure(priv->analog, opts);
	if (ret)
	return ret;

	memcpy(&priv->config, opts, sizeof(priv->config));

	return 0;
	}

	static int phy_meson_axg_mipi_dphy_power_on(struct phy *phy)
	{
	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
	int ret;
	unsigned long temp;

	ret = phy_power_on(priv->analog);
	if (ret)
	return ret;

	/* enable phy clock */
	regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL, 0x1);
	regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL,
	BIT(0) \| /* enable the DSI PLL clock . */
	BIT(7) \| /* enable pll clock which connected to DDR clock path */
	BIT(8)); /* enable the clock divider counter */

	/* enable the divider clock out */
	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(9), BIT(9));

	/* enable the byte clock generation. */
	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(12), BIT(12));
	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), BIT(31));
	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), 0);

	/* Calculate lanebyteclk period in ps */
	temp = (1000000 * 100) / (priv->config.hs_clk_rate / 1000);
	temp = temp * 8 * 10;

	regmap_write(priv->regmap, MIPI_DSI_CLK_TIM,
	DIV_ROUND_UP(priv->config.clk_trail, temp) \|
	(DIV_ROUND_UP(priv->config.clk_post +
	priv->config.hs_trail, temp) << 8) \|
	(DIV_ROUND_UP(priv->config.clk_zero, temp) << 16) \|
	(DIV_ROUND_UP(priv->config.clk_prepare, temp) << 24));
	regmap_write(priv->regmap, MIPI_DSI_CLK_TIM1,
	DIV_ROUND_UP(priv->config.clk_pre, BITS_PER_BYTE));

	regmap_write(priv->regmap, MIPI_DSI_HS_TIM,
	DIV_ROUND_UP(priv->config.hs_exit, temp) \|
	(DIV_ROUND_UP(priv->config.hs_trail, temp) << 8) \|
	(DIV_ROUND_UP(priv->config.hs_zero, temp) << 16) \|
	(DIV_ROUND_UP(priv->config.hs_prepare, temp) << 24));

	regmap_write(priv->regmap, MIPI_DSI_LP_TIM,
	DIV_ROUND_UP(priv->config.lpx, temp) \|
	(DIV_ROUND_UP(priv->config.ta_sure, temp) << 8) \|
	(DIV_ROUND_UP(priv->config.ta_go, temp) << 16) \|
	(DIV_ROUND_UP(priv->config.ta_get, temp) << 24));

	regmap_write(priv->regmap, MIPI_DSI_ANA_UP_TIM, 0x0100);
	regmap_write(priv->regmap, MIPI_DSI_INIT_TIM,
	DIV_ROUND_UP(priv->config.init * NSEC_PER_MSEC, temp));
	regmap_write(priv->regmap, MIPI_DSI_WAKEUP_TIM,
	DIV_ROUND_UP(priv->config.wakeup * NSEC_PER_MSEC, temp));
	regmap_write(priv->regmap, MIPI_DSI_LPOK_TIM, 0x7C);
	regmap_write(priv->regmap, MIPI_DSI_ULPS_CHECK, 0x927C);
	regmap_write(priv->regmap, MIPI_DSI_LP_WCHDOG, 0x1000);
	regmap_write(priv->regmap, MIPI_DSI_TURN_WCHDOG, 0x1000);

	/* Powerup the analog circuit */
	switch (priv->config.lanes) {
	case 1:
	regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xe);
	break;
	case 2:
	regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xc);
	break;
	case 3:
	regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0x8);
	break;
	case 4:
	default:
	regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0);
	break;
	}

	/* Trigger a sync active for esc_clk */
	regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(1), BIT(1));

	return 0;
	}

	static int phy_meson_axg_mipi_dphy_power_off(struct phy *phy)
	{
	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);

	regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xf);
	regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31));

	phy_power_off(priv->analog);

	return 0;
	}

	static int phy_meson_axg_mipi_dphy_exit(struct phy *phy)
	{
	struct phy_meson_axg_mipi_dphy_priv *priv = phy_get_drvdata(phy);
	int ret;

	ret = phy_exit(priv->analog);
	if (ret)
	return ret;

	return reset_control_reset(priv->reset);
	}

	static const struct phy_ops phy_meson_axg_mipi_dphy_ops = {
	.configure = phy_meson_axg_mipi_dphy_configure,
	.init = phy_meson_axg_mipi_dphy_init,
	.exit = phy_meson_axg_mipi_dphy_exit,
	.power_on = phy_meson_axg_mipi_dphy_power_on,
	.power_off = phy_meson_axg_mipi_dphy_power_off,
	.owner = THIS_MODULE,
	};

	static int phy_meson_axg_mipi_dphy_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct phy_provider *phy_provider;
	struct resource *res;
	struct phy_meson_axg_mipi_dphy_priv *priv;
	struct phy *phy;
	void __iomem *base;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->dev = dev;
	platform_set_drvdata(pdev, priv);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	priv->regmap = devm_regmap_init_mmio(dev, base,
	&phy_meson_axg_mipi_dphy_regmap_conf);
	if (IS_ERR(priv->regmap))
	return PTR_ERR(priv->regmap);

	priv->clk = devm_clk_get(dev, "pclk");
	if (IS_ERR(priv->clk))
	return PTR_ERR(priv->clk);

	priv->reset = devm_reset_control_get(dev, "phy");
	if (IS_ERR(priv->reset))
	return PTR_ERR(priv->reset);

	priv->analog = devm_phy_get(dev, "analog");
	if (IS_ERR(priv->analog))
	return PTR_ERR(priv->analog);

	ret = clk_prepare_enable(priv->clk);
	if (ret)
	return ret;

	ret = reset_control_deassert(priv->reset);
	if (ret)
	return ret;

	phy = devm_phy_create(dev, NULL, &phy_meson_axg_mipi_dphy_ops);
	if (IS_ERR(phy)) {
	ret = PTR_ERR(phy);
	if (ret != -EPROBE_DEFER)
	dev_err(dev, "failed to create PHY\n");

	return ret;
	}

	phy_set_drvdata(phy, priv);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

	return PTR_ERR_OR_ZERO(phy_provider);
	}

	static const struct of_device_id phy_meson_axg_mipi_dphy_of_match[] = {
	{ .compatible = "amlogic,axg-mipi-dphy", },
	{ },
	};
	MODULE_DEVICE_TABLE(of, phy_meson_axg_mipi_dphy_of_match);

	static struct platform_driver phy_meson_axg_mipi_dphy_driver = {
	.probe = phy_meson_axg_mipi_dphy_probe,
	.driver = {
	.name = "phy-meson-axg-mipi-dphy",
	.of_match_table = phy_meson_axg_mipi_dphy_of_match,
	},
	};
	module_platform_driver(phy_meson_axg_mipi_dphy_driver);

	MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
	MODULE_DESCRIPTION("Meson AXG MIPI DPHY driver");
	MODULE_LICENSE("GPL v2");