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>

1 files changed, 56 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 91b7c62324b5..2e482b13d25e 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -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);