linux-kernel - [PATCH 1/2] arm64: dts: allwinner: a64: Add CEC clock to HDMI

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Date:   Sat, 20 Nov 2021 08:34:47 +0100
From:   Jernej Skrabec <jernej.skrabec@...il.com>
To:     mripard@...nel.org, wens@...e.org
Cc:     robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...il.com>
Subject: [PATCH 1/2] arm64: dts: allwinner: a64: Add CEC clock to HDMI

Experimentation determined that HDMI CEC controller inside DW HDMI block
depends on 32k clock from RTC. If this clock is tampered with, HDMI CEC
communication starts or stops working, depending on situation.

SoC user manual doesn't say anything about CEC, so this was overlooked.
Fix this by adding dependency to RTC 32k clock.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
---
 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 5ba379078500..741bd19fa8ec 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -1220,8 +1220,8 @@ hdmi: hdmi@...0000 {
 			reg-io-width = <1>;
 			interrupts = <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&ccu CLK_BUS_HDMI>, <&ccu CLK_HDMI_DDC>,
-				 <&ccu CLK_HDMI>;
-			clock-names = "iahb", "isfr", "tmds";
+				 <&ccu CLK_HDMI>, <&rtc 0>;
+			clock-names = "iahb", "isfr", "tmds", "cec";
 			resets = <&ccu RST_BUS_HDMI1>;
 			reset-names = "ctrl";
 			phys = <&hdmi_phy>;
-- 
2.34.0