linux-kernel - [PATCH 1/2] arm64: dts: qcom: sc7280-herobrine: Drop outputs on fpmcu pins

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Date:   Wed, 16 Mar 2022 18:06:39 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Alexandru M Stan <amstan@...omium.org>
Subject: [PATCH 1/2] arm64: dts: qcom: sc7280-herobrine: Drop outputs on fpmcu pins

Having these pins with outputs is good on a fresh boot because it puts
the boot and reset pins in a known "good" state. Unfortunately, that
conflicts with the fingerprint firmware flashing code. The firmware
flashing process binds and unbinds the cros-ec and spidev drivers and
that reapplies the pin output values after the flashing code has
overridden the gpio values. This causes a problem because we try to put
the device into bootloader mode, bind the spidev driver and that
inadvertently puts it right back into normal boot mode, breaking the
flashing process.

Fix this by removing the outputs. We'll introduce a binding for
fingerprint cros-ec specifically to set the gpios properly via gpio APIs
during cros-ec driver probe instead.

Cc: Douglas Anderson <dianders@...omium.org>
Cc: Matthias Kaehlcke <mka@...omium.org>
Cc: Alexandru M Stan <amstan@...omium.org>
Fixes: 116f7cc43d28 ("arm64: dts: qcom: sc7280: Add herobrine-r1")
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
index dc17f2079695..984a7faf0888 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
@@ -677,7 +677,6 @@ fp_rst_l: fp-rst-l {
 		function = "gpio";
 		bias-disable;
 		drive-strength = <2>;
-		output-high;
 	};

 	fp_to_ap_irq_l: fp-to-ap-irq-l {
@@ -691,7 +690,6 @@ fpmcu_boot0: fpmcu-boot0 {
 		pins = "gpio68";
 		function = "gpio";
 		bias-disable;
-		output-low;
 	};

 	gsc_ap_int_odl: gsc-ap-int-odl {
-- 
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