usb: dwc3: exynos: Add support for Exynos5433 variant with all clocks

DWC3 variant found in Exynos5433 SoCs requires keeping all DRD30/UHOST30
clocks enabled all the time the driver does any access to DWC3 registers,
otherwise external abort happens. So far DWC3 hardware module worked with
samsung,exynos5250-dwusb3 compatible only by luck when built into kernel:
all DRD30 clocks were left enabled by bootloader and later kept enabled
by the DRD PHY driver. However, if one tried to use Exnos DWC3 driver as
a module or performed system suspend/resume cycle, external abort
happened. This patch finally fixes this issue.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 3e4c38b..636630f 100644 (file)
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -19,6 +19,7 @@ Exception for clocks:
     "cavium,octeon-7130-usb-uctl"
     "qcom,dwc3"
     "samsung,exynos5250-dwusb3"
+    "samsung,exynos5433-dwusb3"
     "samsung,exynos7-dwusb3"
     "sprd,sc9860-dwc3"
     "st,stih407-dwc3"

diff --git a/Documentation/devicetree/bindings/usb/exynos-usb.txt b/Documentation/devicetree/bindings/usb/exynos-usb.txt
index c973743..b7111f4 100644 (file)
--- a/Documentation/devicetree/bindings/usb/exynos-usb.txt
+++ b/Documentation/devicetree/bindings/usb/exynos-usb.txt
@@ -83,6 +83,8 @@ Required properties:
  - compatible: should be one of the following -
               "samsung,exynos5250-dwusb3": for USB 3.0 DWC3 controller on
                                            Exynos5250/5420.
+              "samsung,exynos5433-dwusb3": for USB 3.0 DWC3 controller on
+                                           Exynos5433.
               "samsung,exynos7-dwusb3": for USB 3.0 DWC3 controller on Exynos7.
  - #address-cells, #size-cells : should be '1' if the device has sub-nodes
                                 with 'reg' property.

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index 3f434a5..cb7fcd7 100644 (file)
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -162,6 +162,12 @@ static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
        .suspend_clk_idx = -1,
 };
 
+static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
+       .clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
+       .num_clks = 4,
+       .suspend_clk_idx = 1,
+};
+
 static const struct dwc3_exynos_driverdata exynos7_drvdata = {
        .clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
        .num_clks = 3,
@@ -173,6 +179,9 @@ static const struct of_device_id exynos_dwc3_match[] = {
                .compatible = "samsung,exynos5250-dwusb3",
                .data = &exynos5250_drvdata,
        }, {
+               .compatible = "samsung,exynos5433-dwusb3",
+               .data = &exynos5433_drvdata,
+       }, {
                .compatible = "samsung,exynos7-dwusb3",
                .data = &exynos7_drvdata,
        }, {