linux-kernel - Re: [PATCH v3 3/3] mips: dts: realtek: Add I2C controllers

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Message-ID: <ocmrfbu4atns3c2p7xev7vhktfzv3roy2ijz5qhqklylelgkor@zkrqoeiyvqoi>
Date: Tue, 24 Sep 2024 10:50:10 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: andi.shyti@...nel.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, tsbogend@...ha.franken.de, linux-i2c@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH v3 3/3] mips: dts: realtek: Add I2C controllers

On Tue, Sep 24, 2024 at 11:02:30AM +1200, Chris Packham wrote:
> Add the I2C controllers that are part of the RTL9300 SoC.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> 
> Notes:
>     Changes in v2:
>     - Use reg property
> 
>  arch/mips/boot/dts/realtek/rtl930x.dtsi | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/mips/boot/dts/realtek/rtl930x.dtsi b/arch/mips/boot/dts/realtek/rtl930x.dtsi
> index cf1b38b6c353..cc43025cd46c 100644
> --- a/arch/mips/boot/dts/realtek/rtl930x.dtsi
> +++ b/arch/mips/boot/dts/realtek/rtl930x.dtsi
> @@ -33,12 +33,30 @@ lx_clk: clock-175mhz {
>  	switch0: switch@...00000 {
>  		compatible = "realtek,rtl9302c-switch", "syscon", "simple-mfd";
>  		reg = <0x1b000000 0x10000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
>  
>  		reboot {
>  			compatible = "syscon-reboot";
>  			offset = <0x0c>;
>  			value = <0x01>;
>  		};
> +
> +		i2c0: i2c@36c {
> +			compatible = "realtek,rtl9300-i2c";
> +			reg = <0x36c 0x14>;
> +			status = "disabled";
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};

This should be sent as one series... You have dependency otherwise. Also
this points to issue of mixing nodes with and without unit address.

I think i2c children should be under some sort of "i2c" bus node.

Please propose entire realtek,rtl9302c-switch binding with the I2C. It's
very confusing to see it partial.


Best regards,
Krzysztof