linux-kernel - [PATCH v2 2/2] arm64: dts: qcom: Switch sc7180-trogdor to control SPI CS via GPIO

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Date:   Fri, 18 Sep 2020 17:45:28 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     swboyd@...omium.org, linux-arm-msm@...r.kernel.org,
        akashast@...eaurora.org, Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] arm64: dts: qcom: Switch sc7180-trogdor to control SPI CS via GPIO

As talked about in the patch ("arm64: dts: qcom: sc7180: Provide
pinconf for SPI to use GPIO for CS"), on some boards it makes much
more sense (and is much more efficient) to think of the SPI Chip
Select as a GPIO.  Trogdor is one such board where the SPI parts don't
run in GSI mode and we do a lot of SPI traffic.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

(no changes since v1)

 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index bf875589d364..0759896a0df5 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -776,7 +776,20 @@ &sdhc_2 {
 	cd-gpios = <&tlmm 69 GPIO_ACTIVE_LOW>;
 };
 
+&spi0 {
+	pinctrl-0 = <&qup_spi0_cs_gpio>;
+	cs-gpios = <&tlmm 37 GPIO_ACTIVE_LOW>;
+};
+
+&spi6 {
+	pinctrl-0 = <&qup_spi6_cs_gpio>;
+	cs-gpios = <&tlmm 62 GPIO_ACTIVE_LOW>;
+};
+
 ap_spi_fp: &spi10 {
+	pinctrl-0 = <&qup_spi10_cs_gpio>;
+	cs-gpios = <&tlmm 89 GPIO_ACTIVE_LOW>;
+
 	cros_ec_fp: ec@0 {
 		compatible = "google,cros-ec-spi";
 		reg = <0>;
@@ -937,7 +950,7 @@ pinconf {
 	};
 };
 
-&qup_spi0_default {
+&qup_spi0_cs_gpio {
 	pinconf {
 		pins = "gpio34", "gpio35", "gpio36", "gpio37";
 		drive-strength = <2>;
@@ -945,7 +958,7 @@ pinconf {
 	};
 };
 
-&qup_spi6_default {
+&qup_spi6_cs_gpio {
 	pinconf {
 		pins = "gpio59", "gpio60", "gpio61", "gpio62";
 		drive-strength = <2>;
@@ -953,7 +966,7 @@ pinconf {
 	};
 };
 
-&qup_spi10_default {
+&qup_spi10_cs_gpio {
 	pinconf {
 		pins = "gpio86", "gpio87", "gpio88", "gpio89";
 		drive-strength = <2>;
-- 
2.28.0.681.g6f77f65b4e-goog