linux-kernel - [PATCH] arm64: dts: mt7622: add irq to spi-nor controller

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Date:   Sat, 30 Apr 2022 23:51:11 +0800
From:   Chuanhong Guo <gch981213@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Chuanhong Guo <gch981213@...il.com>, stable@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] arm64: dts: mt7622: add irq to spi-nor controller

Save some CPU from unnecessary polling and make SPI flash reading
a tiny bit faster.

Cc: <stable@...r.kernel.org> # v5.7+
Fixes: 23beb1adb5f6 ("arm64: dts: mt7622: add flash related device nodes")
Signed-off-by: Chuanhong Guo <gch981213@...il.com>
---
The nor controller driver in kernem when this dt is added doesn't
support IRQ so there isn't one defined in dt back then. However,
device-tree is supposed to describe the hardware, so I think this
can count as a fix.
My main purpose for the fixes tag is just for the linux-stable
backport though. spi-mtk-nor supports interrupt since v5.7.

 arch/arm64/boot/dts/mediatek/mt7622.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
index 8c2563a3919a..e263a81a011b 100644
--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
@@ -570,6 +570,7 @@ nor_flash: spi@...14000 {
 		compatible = "mediatek,mt7622-nor",
 			     "mediatek,mt8173-nor";
 		reg = <0 0x11014000 0 0xe0>;
+		interrupts = <GIC_SPI 88 IRQ_TYPE_LEVEL_LOW>;
 		clocks = <&pericfg CLK_PERI_FLASH_PD>,
 			 <&topckgen CLK_TOP_FLASH_SEL>;
 		clock-names = "spi", "sf";
-- 
2.35.1