linux-kernel - [PATCH] ARC: HSDK: DTS: Add reset controller node to manage ethernet reset

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Date:   Wed,  9 Aug 2017 21:09:25 +0300
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Subject: [PATCH] ARC: HSDK: DTS: Add reset controller node to manage ethernet reset

DW ethernet controller on HSDK hangs sometimes after SW reset, so
add reset node to make possible to reset DW ethernet controller HW.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
---
NOTE: this patch is effective only if patches to DW ethernet controller
      and reset controller are applied (they are already in linux-next)

 arch/arc/boot/dts/hsdk.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
index e096879..84052db 100644
--- a/arch/arc/boot/dts/hsdk.dts
+++ b/arch/arc/boot/dts/hsdk.dts
@@ -12,6 +12,7 @@
 /dts-v1/;
 
 #include <dt-bindings/net/ti-dp83867.h>
+#include <dt-bindings/reset/snps,hsdk-v1-reset.h>
 
 / {
 	model = "snps,hsdk";
@@ -102,6 +103,12 @@
 
 		ranges = <0x00000000 0xf0000000 0x10000000>;
 
+		cgu_rst: reset {
+			compatible = "snps,hsdk-v1.0-reset";
+			#reset-cells = <1>;
+			reg = <0x8A0 0x4>, <0xFF0 0x4>;
+		};
+
 		serial: serial@...0 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x5000 0x100>;
@@ -141,6 +148,8 @@
 			clocks = <&gmacclk>;
 			clock-names = "stmmaceth";
 			phy-handle = <&phy0>;
+			resets = <&cgu_rst HSDK_V1_ETH_RESET>;
+			reset-names = "stmmaceth";
 
 			mdio {
 				#address-cells = <1>;
-- 
2.9.3