linux-kernel - [PATCH v2 3/5] powerpc: wii.dts: Expose HW

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Date:   Thu, 28 Oct 2021 00:35:13 +0200
From:   Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>
Cc:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>,
        rw-r-r-0644 <r.r.qwertyuiop.r.r@...il.com>,
        Ash Logan <ash@...quark.com>,
        Jonathan Neuschäfer <j.ne@...teo.net>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org
Subject: [PATCH v2 3/5] powerpc: wii.dts: Expose HW_SRNPROT on this platform

This Hollywood register isn’t properly understood, but can allow or
reject access to the SRAM, which we need to set for RTC usage if it
isn’t previously set correctly beforehand.

See https://wiibrew.org/wiki/Hardware/Hollywood_Registers#HW_SRNPROT

Signed-off-by: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
---
 arch/powerpc/boot/dts/wii.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/boot/dts/wii.dts b/arch/powerpc/boot/dts/wii.dts
index c5720fdd0686..34d9732d5910 100644
--- a/arch/powerpc/boot/dts/wii.dts
+++ b/arch/powerpc/boot/dts/wii.dts
@@ -175,6 +175,11 @@ PIC1: pic1@...0030 {
 			interrupts = <14>;
 		};
 
+		srnprot@...0060 {
+			compatible = "nintendo,hollywood-srnprot";
+			reg = <0x0d800060 0x4>;
+		};
+
 		GPIO: gpio@...00c0 {
 			#gpio-cells = <2>;
 			compatible = "nintendo,hollywood-gpio";
-- 
2.33.1