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Commit 91aa3661 authored by Shawn Lin's avatar Shawn Lin Committed by Ulf Hansson
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mmc: sdhci-of-arasan: add phy support for sdhci-of-arasan 



This patch adds Generic PHY access for sdhci-of-arasan. Driver
can get PHY handler from dt-binding, and power-on/init the PHY.
Currently, it's just mandatory for arasan,sdhci-5.1.

Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 278d0962

drivers/mmc/host/sdhci-of-arasan.c

+56 −1
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 


#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/phy/phy.h>

#include "sdhci-pltfm.h"



#define SDHCI_ARASAN_CLK_CTRL_OFFSET	0x2c
@@ -32,9 +33,11 @@ 
/**

 * struct sdhci_arasan_data

 * @clk_ahb:	Pointer to the AHB clock

 * @phy: Pointer to the generic phy

 */

struct sdhci_arasan_data {

	struct clk	*clk_ahb;

	struct phy	*phy;

};



static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
@@ -88,6 +91,15 @@ static int sdhci_arasan_suspend(struct device *dev) 
	if (ret)

		return ret;



	if (!IS_ERR(sdhci_arasan->phy)) {

		ret = phy_power_off(sdhci_arasan->phy);

		if (ret) {

			dev_err(dev, "Cannot power off phy.\n");

			sdhci_resume_host(host);

			return ret;

		}

	}



	clk_disable(pltfm_host->clk);

	clk_disable(sdhci_arasan->clk_ahb);
@@ -121,6 +133,14 @@ static int sdhci_arasan_resume(struct device *dev) 
		return ret;

	}



	if (!IS_ERR(sdhci_arasan->phy)) {

		ret = phy_power_on(sdhci_arasan->phy);

		if (ret) {

			dev_err(dev, "Cannot power on phy.\n");

			return ret;

		}

	}



	return sdhci_resume_host(host);

}

#endif /* ! CONFIG_PM_SLEEP */
@@ -179,12 +199,42 @@ static int sdhci_arasan_probe(struct platform_device *pdev) 
		goto clk_disable_all;

	}



	sdhci_arasan->phy = ERR_PTR(-ENODEV);

	if (of_device_is_compatible(pdev->dev.of_node,

				    "arasan,sdhci-5.1")) {

		sdhci_arasan->phy = devm_phy_get(&pdev->dev,

						 "phy_arasan");

		if (IS_ERR(sdhci_arasan->phy)) {

			ret = PTR_ERR(sdhci_arasan->phy);

			dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");

			goto clk_disable_all;

		}



		ret = phy_init(sdhci_arasan->phy);

		if (ret < 0) {

			dev_err(&pdev->dev, "phy_init err.\n");

			goto clk_disable_all;

		}



		ret = phy_power_on(sdhci_arasan->phy);

		if (ret < 0) {

			dev_err(&pdev->dev, "phy_power_on err.\n");

			goto err_phy_power;

		}

	}



	ret = sdhci_add_host(host);

	if (ret)

		goto clk_disable_all;

		goto err_add_host;



	return 0;



err_add_host:

	if (!IS_ERR(sdhci_arasan->phy))

		phy_power_off(sdhci_arasan->phy);

err_phy_power:

	if (!IS_ERR(sdhci_arasan->phy))

		phy_exit(sdhci_arasan->phy);

clk_disable_all:

	clk_disable_unprepare(clk_xin);

clk_dis_ahb:
@@ -202,6 +252,11 @@ static int sdhci_arasan_remove(struct platform_device *pdev) 
	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);

	struct clk *clk_ahb = sdhci_arasan->clk_ahb;



	if (!IS_ERR(sdhci_arasan->phy)) {

		phy_power_off(sdhci_arasan->phy);

		phy_exit(sdhci_arasan->phy);

	}



	ret = sdhci_pltfm_unregister(pdev);



	clk_disable_unprepare(clk_ahb);