linux-kernel - Re: [PATCH v9 6/8] riscv: dts: spacemit: enable the i2c8 adapter

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Message-ID: <20250724211113-GYA748868@gentoo>
Date: Fri, 25 Jul 2025 05:11:13 +0800
From: Yixun Lan <dlan@...too.org>
To: Alex Elder <elder@...cstar.com>
Cc: lee@...nel.org, lgirdwood@...il.com, broonie@...nel.org,
	alexandre.belloni@...tlin.com, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, mat.jonczyk@...pl, paul.walmsley@...ive.com,
	palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr,
	linux.amoon@...il.com, troymitchell988@...il.com,
	guodong@...cstar.com, linux-rtc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
	spacemit@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 6/8] riscv: dts: spacemit: enable the i2c8 adapter

Hi Alex,

On 15:25 Thu 24 Jul     , Alex Elder wrote:
> Define properties for the I2C adapter that provides access to the
> SpacemiT P1 PMIC.  Enable this adapter on the Banana Pi BPI-F3.
> 
> Signed-off-by: Alex Elder <elder@...cstar.com>
> ---
>  arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts | 15 +++++++++++++++
>  arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi    |  7 +++++++
>  arch/riscv/boot/dts/spacemit/k1.dtsi            | 11 +++++++++++
>  3 files changed, 33 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> index fe22c747c5012..7c9f91c88e01a 100644
> --- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> +++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
> @@ -40,6 +40,21 @@ &emmc {
>  	status = "okay";
>  };
>  
> +&i2c8 {
> +	pinctrl-0 = <&i2c8_cfg>;
> +	pinctrl-names = "default";
..
> +	#address-cells = <1>;
> +	#size-cells = <0>;
I think these two can be moved into dtsi, as they are
common and fixed properties for the i2c controller

> +	status = "okay";
> +
> +	pmic@41 {
> +		compatible = "spacemit,p1";
> +		reg = <0x41>;
> +		interrupts = <64>;
..
> +		status = "okay";
status property here can be dropped as enabled by default
> +	};
> +};
> +
>  &uart0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&uart0_2_cfg>;
> diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
> index 3810557374228..96d7a46d4bf77 100644
> --- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
> +++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
> @@ -11,6 +11,13 @@
>  #define K1_GPIO(x)	(x / 32) (x % 32)
>  
>  &pinctrl {
> +	i2c8_cfg: i2c8-cfg {
> +		i2c8-0-pins {
> +			pinmux = <K1_PADCONF(93, 0)>,	/* PWR_SCL */
> +				 <K1_PADCONF(94, 0)>;	/* PWR_SDA */
> +		};
> +	};
> +
>  	uart0_2_cfg: uart0-2-cfg {
>  		uart0-2-pins {
>  			pinmux = <K1_PADCONF(68, 2)>,
> diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
> index abde8bb07c95c..2a5a132d5a774 100644
> --- a/arch/riscv/boot/dts/spacemit/k1.dtsi
> +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
> @@ -459,6 +459,17 @@ pwm7: pwm@...1bc00 {
>  			status = "disabled";
>  		};
>  
> +		i2c8: i2c@...1d800 {
> +			compatible = "spacemit,k1-i2c";
> +			reg = <0x0 0xd401d800 0x0 0x38>;
..
> +			interrupts = <19>;
I'd suggest to move interrupts property after clock, see my similar
comment
https://lore.kernel.org/all/20250724121916-GYA748228@gentoo/

> +			clocks = <&syscon_apbc CLK_TWSI8>,
> +				 <&syscon_apbc CLK_TWSI8_BUS>;
> +			clock-names = "func", "bus";
> +			clock-frequency = <400000>;
> +			status = "disabled";
> +		};
> +
>  		pinctrl: pinctrl@...1e000 {
>  			compatible = "spacemit,k1-pinctrl";
>  			reg = <0x0 0xd401e000 0x0 0x400>;
> -- 
> 2.43.0
> 

-- 
Yixun Lan (dlan)