linux-kernel - [PATCH v2 4/6] riscv: dts: spacemit: add pwm14

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Message-ID: <20250420070251.378950-5-guodong@riscstar.com>
Date: Sun, 20 Apr 2025 15:02:49 +0800
From: Guodong Xu <guodong@...cstar.com>
To: ukleinek@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	paul.walmsley@...ive.com,
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Cc: elder@...cstar.com,
	linux-pwm@...r.kernel.org,
	devicetree@...r.kernel.org,
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	spacemit@...ts.linux.dev,
	guodong@...cstar.com
Subject: [PATCH v2 4/6] riscv: dts: spacemit: add pwm14_1 pinctrl setting

This patch adds the option 1 (hence the name pwm14_1) pinctrl
configuration for PWM14 on the SpacemiT K1 SoC.

PWM14 option 1 is used for PWM-based backlight control on MIPI displays.
This configuration is present on all existing K1 development boards,
such as the Banana Pi BPI-F3 and the Milk-V Jupiter.

For reference, a more complete list of PWM0-PWM19 pinctrl configurations
including all options can be found in [1].

Note: Since the corresponding functionality for other pins is not yet
in use or ready for upstreaming, this patch includes only the pwm14_1
setting.

[1] https://lore.kernel.org/all/20250411131423.3802611-7-guodong@riscstar.com/

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
v2: Discard pwm0-pwm19 pinctrl configurations, and adds only pwm14_1_cfg

arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
index 283663647a86..195eb8874f3c 100644
--- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -20,4 +20,11 @@ uart0-2-pins {
 			drive-strength = <32>;
 		};
 	};
+	pwm14_1_cfg: pwm14-1-cfg {
+		pwm14-1-pins {
+			pinmux = <K1_PADCONF(44, 4)>;
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
 };
-- 
2.43.0