linux-kernel - [PATCH 7/7] arm64: dts: qcom: sc7280: Hook up the touchscreen IO rail on evoker

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Date:   Mon,  6 Feb 2023 18:48:16 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        devicetree@...r.kernel.org, Stephen Kitt <steve@....org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] arm64: dts: qcom: sc7280: Hook up the touchscreen IO rail on evoker

On older revisions of evoker, the touchscreen was either
non-functional or needed special hardware magic to get it talking
properly. It's been decided that the proper way going forward is to
use L3C to power some buffers on the QCard and then configure the
touchscreens for 1.8V. Let's do that.

Note that this is safe to do even on older revs even if it might not
make the touchscreen work there (because they didn't have a properly
stuffed QCard). As talked about in the patch ("arm64: dts: qcom:
sc7280: On QCard, regulator L3C should be 1.8V") the L3C regulator
didn't go anywhere at all on older revs.

This patch relies on the patch ("HID: i2c-hid: goodix: Add
mainboard-vddio-supply") in order to function properly. Without that
patch this one won't do any harm but it won't actually accomplish its
goal.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
I haven't yet received real hardware to test this on, but it's a very
simple patch and, in the very least, highly unlikely to make anything
worse. No real users have these boards yet.

 arch/arm64/boot/dts/qcom/sc7280-herobrine-evoker.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-evoker.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-evoker.dtsi
index 3d639c70a06e..0add7a2a099c 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-evoker.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-evoker.dtsi
@@ -55,6 +55,7 @@ ap_ts: touchscreen@5d {
 		reset-gpios = <&tlmm 54 GPIO_ACTIVE_LOW>;

 		vdd-supply = <&ts_avdd>;
+		mainboard-vddio-supply = <&ts_avccio>;
 	};
 };

-- 
2.39.1.519.gcb327c4b5f-goog