arm64: zynqmp: Enable cadence WDT for zcu100

Enable watchdog on zcu100 to make sure if there is a bug in the u-boot
there is proper reset.
Watchdog expires and PMU fw is informed and based on setting proper
action is taken.

The patch is enabling reset-on-timeout feature and also fixing fixed
clock rate for watchdog where 100MHz is max (and also default) clock value.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/arch/arm/dts/zynqmp-clk.dtsi b/arch/arm/dts/zynqmp-clk.dtsi
index a8664e81870e928326843f1fc866a4a0e8d111cd..a795efdc15c8c5f4e77cf717714a0950d21b058b 100644 (file)
--- a/arch/arm/dts/zynqmp-clk.dtsi
+++ b/arch/arm/dts/zynqmp-clk.dtsi
@@ -219,7 +219,7 @@
 };
 
 &watchdog0 {
-       clocks = <&clk250>;
+       clocks = <&clk100>;
 };
 
 &xilinx_drm {

diff --git a/arch/arm/dts/zynqmp-zcu100-revC.dts b/arch/arm/dts/zynqmp-zcu100-revC.dts
index 9114f9814045564388fca1e269e7066ccc7a2b39..bcd9c3958ffa795efd8cf3d05165a7b3f2ab656b 100644 (file)
--- a/arch/arm/dts/zynqmp-zcu100-revC.dts
+++ b/arch/arm/dts/zynqmp-zcu100-revC.dts
@@ -332,6 +332,7 @@
 
 &watchdog0 {
        status = "okay";
+       reset-on-timeout;
 };
 
 &xilinx_ams {

diff --git a/configs/xilinx_zynqmp_zcu100_revC_defconfig b/configs/xilinx_zynqmp_zcu100_revC_defconfig
index 87b7941a0e5e40b52589412fbcc9d8500af16bb3..1625ef347a43d540487975805f4ca005516423e2 100644 (file)
--- a/configs/xilinx_zynqmp_zcu100_revC_defconfig
+++ b/configs/xilinx_zynqmp_zcu100_revC_defconfig
@@ -80,5 +80,7 @@ CONFIG_USB_ULPI=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_DOWNLOAD=y
+CONFIG_WDT=y
+CONFIG_WDT_CDNS=y
 CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_EFI_LOADER_BOUNCE_BUFFER=y