linux-kernel - Re: [PATCH 4/7] arm64: dts: rockchip: Add pinctrl and gpio nodes for RK3528

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Message-ID: <Z8GT3rUEyXrTUgtJ@pie.lan>
Date: Fri, 28 Feb 2025 10:46:29 +0000
From: Yao Zi <ziyao@...root.org>
To: Jonas Karlman <jonas@...boo.se>, Heiko Stuebner <heiko@...ech.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] arm64: dts: rockchip: Add pinctrl and gpio nodes for
 RK3528

On Fri, Feb 28, 2025 at 06:40:10AM +0000, Jonas Karlman wrote:
> Add pinctrl and gpio nodes for RK3528 and import rk3528-pinctrl.dtsi
> from vendor linux-6.1-stan-rkr5 kernel with the hdmi-pins-idle node
> removed due to missing label reference to pcfg_output_low_pull_down.
> 
> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> ---
> This was mostly imported from vendor kernel, however the main commit [1]
> list 28 signed-off-by tags, unclear who I should use as author and what
> signed-off-by tags to include.
> 
> [1] https://github.com/rockchip-linux/kernel/commit/c17d6325959f0ec1af901e8a17919163454190a2
> ---
>  .../boot/dts/rockchip/rk3528-pinctrl.dtsi     | 1397 +++++++++++++++++
>  arch/arm64/boot/dts/rockchip/rk3528.dtsi      |   82 +
>  2 files changed, 1479 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/rockchip/rk3528-pinctrl.dtsi
> 

> diff --git a/arch/arm64/boot/dts/rockchip/rk3528.dtsi b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> index 0fb90f5c291c..d3e2a64ff2d5 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> @@ -4,8 +4,10 @@
>   * Copyright (c) 2024 Yao Zi <ziyao@...root.org>
>   */
>  
> +#include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/pinctrl/rockchip.h>
>  #include <dt-bindings/clock/rockchip,rk3528-cru.h>
>  #include <dt-bindings/reset/rockchip,rk3528-cru.h>
>  
> @@ -17,6 +19,11 @@ / {
>  	#size-cells = <2>;
>  
>  	aliases {
> +		gpio0 = &gpio0;
> +		gpio1 = &gpio1;
> +		gpio2 = &gpio2;
> +		gpio3 = &gpio3;
> +		gpio4 = &gpio4;
>  		serial0 = &uart0;
>  		serial1 = &uart1;
>  		serial2 = &uart2;
> @@ -166,6 +173,11 @@ cru: clock-controller@...a0000 {
>  			#reset-cells = <1>;
>  		};
>  
> +		ioc_grf: syscon@...40000 {
> +			compatible = "rockchip,rk3528-ioc-grf", "syscon";
> +			reg = <0x0 0xff540000 0x0 0x40000>;
> +		};
> +
>  		uart0: serial@...f0000 {
>  			compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
>  			reg = <0x0 0xff9f0000 0x0 0x100>;
> @@ -264,5 +276,75 @@ saradc: adc@...e0000 {
>  			#io-channel-cells = <1>;
>  			status = "disabled";
>  		};
> +
> +		pinctrl: pinctrl {
> +			compatible = "rockchip,rk3528-pinctrl";
> +			rockchip,grf = <&ioc_grf>;
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges;

I doubt whether the pincontroller should be placed under simple-bus:
without a reg property, it doesn't look like a MMIO device.

Actually it is, although all the registers stay in the ioc grf. Maybe
it should be considered as child of the grf.

Best regards,
Yao Zi