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From: Stephen Boyd <swboyd@chromium.org>
To: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
	Douglas Anderson <dianders@chromium.org>
Subject: [PATCH] arm64: dts: qcom: trogdor: Add no-hpd to DSI bridge node
Date: Tue, 23 Mar 2021 19:55:34 -0700
Message-ID: <20210324025534.1837405-1-swboyd@chromium.org> (raw)

We should indicate that we're not using the HPD pin on this device, per
the binding document. Otherwise if code in the future wants to enable
HPD in the bridge when this property is absent we'll be wasting power
powering hpd when we don't use it on trogdor boards. We didn't notice
this before because the kernel driver blindly disables hpd, but that
won't be true for much longer.

Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Douglas Anderson <dianders@chromium.org>
Fixes: 7ec3e67307f8 ("arm64: dts: qcom: sc7180-trogdor: add initial trogdor and lazor dt")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index 07c8b2c926c0..298af6d7fb4a 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -595,6 +595,8 @@ sn65dsi86_bridge: bridge@2d {
 		clocks = <&rpmhcc RPMH_LN_BB_CLK3>;
 		clock-names = "refclk";
 
+		no-hpd;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
-- 
https://chromeos.dev


             reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-24  2:55 Stephen Boyd [this message]
2021-03-24  3:11 ` Laurent Pinchart
2021-03-24 15:32 ` Doug Anderson
2021-03-24 15:56   ` Stephen Boyd
2021-05-31 21:50 ` patchwork-bot+linux-arm-msm

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