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mmc: sdhci-of-arasan: add phy support for sdhci-of-arasan

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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.

Change-Id: If61621796380c4a12e50fd3140e58342fd5e68b0
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-02-23 09:13:31 +08:00 committed by Gerrit Code Review
parent 7138bcb02e
commit 61b914eb81
1 changed files with 62 additions and 4 deletions
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66
drivers/mmc/host/sdhci-of-arasan.c
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@ -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)
@ -72,7 +75,7 @@ static struct sdhci_pltfm_data sdhci_arasan_pdata = {
/**
* sdhci_arasan_suspend - Suspend method for the driver
* @dev: Address of the device structure
* Returns 0 on success and error value on error
* Return: 0 on success and error value on error
*
* Put the device in a low power state.
*/
@ -88,6 +91,14 @@ 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");
return ret;
}
}
clk_disable(pltfm_host->clk);
clk_disable(sdhci_arasan->clk_ahb);
@ -97,7 +108,7 @@ static int sdhci_arasan_suspend(struct device *dev)
/**
* sdhci_arasan_resume - Resume method for the driver
* @dev: Address of the device structure
* Returns 0 on success and error value on error
* Return: 0 on success and error value on error
*
* Resume operation after suspend
*/
@ -118,11 +129,24 @@ static int sdhci_arasan_resume(struct device *dev)
ret = clk_enable(pltfm_host->clk);
if (ret) {
dev_err(dev, "Cannot enable SD clock.\n");
clk_disable(sdhci_arasan->clk_ahb);
return ret;
goto err_clk_en;
}
if (!IS_ERR(sdhci_arasan->phy)) {
ret = phy_power_on(sdhci_arasan->phy);
if (ret) {
dev_err(dev, "Cannot power on phy.\n");
goto err_phy_power;
}
}
return sdhci_resume_host(host);
err_phy_power:
clk_disable(pltfm_host->clk);
err_clk_en:
clk_disable(sdhci_arasan->clk_ahb);
return ret;
}
#endif /* ! CONFIG_PM_SLEEP */
@ -188,6 +212,30 @@ 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 err_pltfm_free;
@ -195,7 +243,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
return 0;
err_pltfm_free:
if (!IS_ERR(sdhci_arasan->phy))
phy_power_off(sdhci_arasan->phy);
sdhci_pltfm_free(pdev);
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:
@ -210,6 +263,11 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
if (!IS_ERR(sdhci_arasan->phy)) {
phy_power_off(sdhci_arasan->phy);
phy_exit(sdhci_arasan->phy);
}
clk_disable_unprepare(sdhci_arasan->clk_ahb);
return sdhci_pltfm_unregister(pdev);