usb: phy: msm: Use reset framework for LINK and PHY resets

Using reset framework eliminate need of platform specific
callbacks and enable reset lines to be specified in DT files.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 24 insertions, 8 deletions

diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 1bf2d4ee29d2..a6abb1b3a7f0 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -32,6 +32,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/reset.h>
 
 #include <linux/usb.h>
 #include <linux/usb/otg.h>
@@ -235,12 +236,15 @@ static void ulpi_init(struct msm_otg *motg)
 
 static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)
 {
-        int ret = 0;
+        int ret;
 
-        if (!motg->pdata->link_clk_reset)
-                return ret;
+        if (motg->pdata->link_clk_reset)
+                ret = motg->pdata->link_clk_reset(motg->clk, assert);
+        else if (assert)
+                ret = reset_control_assert(motg->link_rst);
+        else
+                ret = reset_control_deassert(motg->link_rst);
 
-        ret = motg->pdata->link_clk_reset(motg->clk, assert);
         if (ret)
                 dev_err(motg->phy.dev, "usb link clk reset %s failed\n",
                         assert ? "assert" : "deassert");
@@ -250,12 +254,13 @@ static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)
 
 static int msm_otg_phy_clk_reset(struct msm_otg *motg)
 {
-        int ret = 0;
+        int ret;
 
-        if (!motg->pdata->phy_clk_reset)
-                return ret;
+        if (motg->pdata->phy_clk_reset)
+                ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
+        else
+                ret = reset_control_reset(motg->phy_rst);
 
-        ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
         if (ret)
                 dev_err(motg->phy.dev, "usb phy clk reset failed\n");
 
@@ -1377,6 +1382,14 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
         id = of_match_device(msm_otg_dt_match, &pdev->dev);
         pdata->phy_type = (int) id->data;
 
+        motg->link_rst = devm_reset_control_get(&pdev->dev, "link");
+        if (IS_ERR(motg->link_rst))
+                return PTR_ERR(motg->link_rst);
+
+        motg->phy_rst = devm_reset_control_get(&pdev->dev, "phy");
+        if (IS_ERR(motg->phy_rst))
+                return PTR_ERR(motg->phy_rst);
+
         pdata->mode = of_usb_get_dr_mode(node);
         if (pdata->mode == USB_DR_MODE_UNKNOWN)
                 pdata->mode = USB_DR_MODE_OTG;
diff --git a/include/linux/usb/msm_hsusb.h b/include/linux/usb/msm_hsusb.h
index bd68299c278e..4e5d9168f52e 100644
--- a/include/linux/usb/msm_hsusb.h
+++ b/include/linux/usb/msm_hsusb.h
@@ -165,6 +165,9 @@ struct msm_otg {
         struct regulator *v3p3;
         struct regulator *v1p8;
         struct regulator *vddcx;
+
+        struct reset_control *phy_rst;
+        struct reset_control *link_rst;
 };
 
 #endif