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Date: Thu, 04 Apr 2024 12:17:57 +0000
To: linux-kernel@vger.kernel.org
From: Raymond Hackley <raymondhackley@protonmail.com>
Cc: Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Stephan Gerhold <stephan@gerhold.net>, Nikita Travkin <nikita@trvn.ru>, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Siddharth Manthan <siddharth.manthan@gmail.com>
Subject: [PATCH v3 2/2] arm64: dts: qcom: msm8916-samsung-fortuna: Add PWM backlight
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From: Siddharth Manthan <siddharth.manthan@gmail.com>

Most of the Galaxy Grand Prime use backlight drivers controlled with PWM
signal.
To simplify the description, add the backlight with the necessary clk-pwm
to the common dtsi.

Signed-off-by: Siddharth Manthan <siddharth.manthan@gmail.com>
[Stephan: Move to fortuna-common and disable on rossa-common]
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
[Raymond: Add the commit message]
Signed-off-by: Raymond Hackley <raymondhackley@protonmail.com>
---
 .../qcom/msm8916-samsung-fortuna-common.dtsi  | 36 +++++++++++++++++++
 .../qcom/msm8916-samsung-rossa-common.dtsi    |  9 +++++
 2 files changed, 45 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-fortuna-common.dtsi b=
/arch/arm64/boot/dts/qcom/msm8916-samsung-fortuna-common.dtsi
index 6c66a24ef1af..5e933fb8b363 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-fortuna-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-fortuna-common.dtsi
@@ -26,6 +26,30 @@ tz-apps@85a00000 {
 =09=09};
 =09};
=20
+=09clk_pwm_backlight: backlight {
+=09=09compatible =3D "pwm-backlight";
+=09=09pwms =3D <&clk_pwm 0 100000>;
+
+=09=09enable-gpios =3D <&tlmm 98 GPIO_ACTIVE_HIGH>;
+
+=09=09brightness-levels =3D <0 255>;
+=09=09num-interpolated-steps =3D <255>;
+=09=09default-brightness-level =3D <128>;
+
+=09=09pinctrl-0 =3D <&backlight_en_default>;
+=09=09pinctrl-names =3D "default";
+=09};
+
+=09clk_pwm: pwm {
+=09=09compatible =3D "clk-pwm";
+=09=09#pwm-cells =3D <2>;
+
+=09=09clocks =3D <&gcc GCC_GP2_CLK>;
+
+=09=09pinctrl-0 =3D <&backlight_pwm_default>;
+=09=09pinctrl-names =3D "default";
+=09};
+
 =09gpio-keys {
 =09=09compatible =3D "gpio-keys";
=20
@@ -199,6 +223,18 @@ &wcnss_mem {
 };
=20
 &tlmm {
+=09backlight_en_default: backlight-en-default-state {
+=09=09pins =3D "gpio98";
+=09=09function =3D "gpio";
+=09=09drive-strength =3D <2>;
+=09=09bias-disable;
+=09};
+
+=09backlight_pwm_default: backlight-pwm-default-state {
+=09=09pins =3D "gpio50";
+=09=09function =3D "gcc_gp2_clk_a";
+=09};
+
 =09fg_alert_default: fg-alert-default-state {
 =09=09pins =3D "gpio121";
 =09=09function =3D "gpio";
diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-rossa-common.dtsi b/a=
rch/arm64/boot/dts/qcom/msm8916-samsung-rossa-common.dtsi
index 4048b72efcdc..b438fa81886c 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-rossa-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-rossa-common.dtsi
@@ -17,3 +17,12 @@ muic: extcon@14 {
 =09=09pinctrl-names =3D "default";
 =09};
 };
+
+/* On rossa backlight is controlled with MIPI DCS commands */
+&clk_pwm {
+=09status =3D "disabled";
+};
+
+&clk_pwm_backlight {
+=09status =3D "disabled";
+};
--=20
2.39.2