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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: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-03-07 23:39:19 +08:00 committed by Ulf Hansson
parent 278d09624e
commit 91aa366109
1 changed files with 56 additions and 1 deletions
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57
drivers/mmc/host/sdhci-of-arasan.c
View File

@ -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);