linux-kernel - [PATCH v1 2/3] arm64: dts: librem5-devkit: Make LED use PWM

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Date:   Sun,  9 Oct 2022 14:26:54 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Guido Günther <agx@...xcpu.org>,
        Markus Niebel <Markus.Niebel@...tq-group.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Vinod Koul <vkoul@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        phone-devel@...r.kernel.org, kernel@...i.sm
Subject: [PATCH v1 2/3] arm64: dts: librem5-devkit: Make LED use PWM

We can use PWM instead of just GPIO allowing us to control brightness.

Signed-off-by: Guido Günther <agx@...xcpu.org>
---
 .../dts/freescale/imx8mq-librem5-devkit.dts    | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
index 6445c6b90b5b..7e4b6d65fd89 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
@@ -61,14 +61,12 @@ button-3 {
 	};
 
 	leds {
-		compatible = "gpio-leds";
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_gpio_leds>;
+		compatible = "pwm-leds";
 
 		led1 {
 			label = "LED 1";
-			gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
-			default-state = "off";
+			max-brightness = <248>;
+			pwms = <&pwm2 0 50000 0>;
 		};
 	};
 
@@ -615,9 +613,9 @@ MX8MQ_IOMUXC_GPIO1_IO05_GPIO1_IO5	0x19  /* TOUCH RST */
 		>;
 	};
 
-	pinctrl_gpio_leds: gpioledgrp {
+	pinctrl_pwm_led: pwmledgrp {
 		fsl,pins = <
-			MX8MQ_IOMUXC_GPIO1_IO13_GPIO1_IO13	0x16
+			MX8MQ_IOMUXC_GPIO1_IO13_PWM2_OUT	0x16
 		>;
 	};
 
@@ -920,6 +918,12 @@ &pwm1 {
 	status = "okay";
 };
 
+&pwm2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm_led>;
+	status = "okay";
+};
+
 &snvs_pwrkey {
 	status = "okay";
 };
-- 
2.35.1