linux-kernel - [PATCH v3 4/4] ARM: dts: imx6qdl-colibri: backlight pwm: Adapt brightness steps

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Message-Id: <20220513102616.48040-5-max.oss.09@gmail.com>
Date:   Fri, 13 May 2022 12:26:15 +0200
From:   Max Krummenacher <max.oss.09@...il.com>
To:     max.krummenacher@...adex.com
Cc:     Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 4/4] ARM: dts: imx6qdl-colibri: backlight pwm: Adapt brightness steps

From: Max Krummenacher <max.krummenacher@...adex.com>

Adapt the brightness steps as the backlight doesn't light up
for very low duty cycles.

Reviewed-by: Fabio Estevam <festevam@...il.com>
Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>

---

(no changes since v2)

Changes in v2:
- add reviewed-by tags
- Split the Backlight PWM patch into two patches, a) #pwm-cells 3, b) adapt brightness steps
- Split to two patches as proposed by Fabio Estevam

 arch/arm/boot/dts/imx6qdl-colibri.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-colibri.dtsi b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
index d91fae92c90a..023e76215064 100644
--- a/arch/arm/boot/dts/imx6qdl-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
@@ -14,8 +14,8 @@
 
 	backlight: backlight {
 		compatible = "pwm-backlight";
-		brightness-levels = <0 4 8 16 32 64 128 255>;
-		default-brightness-level = <6>;
+		brightness-levels = <0 45 63 88 119 158 203 255>;
+		default-brightness-level = <4>;
 		enable-gpios = <&gpio3 26 GPIO_ACTIVE_HIGH>; /* Colibri BL_ON */
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_gpio_bl_on>;
-- 
2.20.1