linux-kernel - [PATCH] arm64: dts: sdm845-mtp: Reserve reserved gpios

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Date:   Fri,  2 Nov 2018 14:45:32 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>
Subject: [PATCH] arm64: dts: sdm845-mtp: Reserve reserved gpios

With the introduction of commit 3edfb7bd76bd ("gpiolib: Show correct
direction from the beginning") the gpiolib will attempt to read the
direction of all pins, which triggers a read from protected register
regions.

The pins 0 through 3 and 81 through 84 are protected, so mark these as
reserved.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Given that mainline has not yet booted on the SDM845 MTP or MSM8998 MTP
(which seems to be the affected platform), I think it's better to pick this
change than to rework the offending commit.

 arch/arm64/boot/dts/qcom/sdm845-mtp.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
index eedfaf8922e2..d667eee4e6d0 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
@@ -352,6 +352,10 @@
 	status = "okay";
 };

+&tlmm {
+	gpio-reserved-ranges = <0 4>, <81 4>;
+};
+
 &uart9 {
 	status = "okay";
 };
-- 
2.18.0