linux-kernel - Re: [PATCH v1 4/6] ARM: dts: hpe: Add I2C Topology

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Message-ID: <0a537c59-acd7-3f7f-8618-cc0e91a6a58a@linaro.org>
Date:   Sat, 17 Dec 2022 11:58:42 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     nick.hawkins@....com, verdun@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, lee@...nel.org,
        linux@...linux.org.uk, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 4/6] ARM: dts: hpe: Add I2C Topology

On 16/12/2022 19:35, nick.hawkins@....com wrote:
> From: Nick Hawkins <nick.hawkins@....com>
> 
> Add 9 I2C Engines, 2 MUXs, and a EEPROM to the device tree.
> 
> Signed-off-by: Nick Hawkins <nick.hawkins@....com>
> ---
>  arch/arm/boot/dts/hpe-bmc-dl360gen10.dts |  72 ++++++++++++++
>  arch/arm/boot/dts/hpe-gxp.dtsi           | 115 +++++++++++++++++++++++
>  2 files changed, 187 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/hpe-bmc-dl360gen10.dts b/arch/arm/boot/dts/hpe-bmc-dl360gen10.dts
> index 3a7382ce40ef..d9008e2cfed3 100644
> --- a/arch/arm/boot/dts/hpe-bmc-dl360gen10.dts
> +++ b/arch/arm/boot/dts/hpe-bmc-dl360gen10.dts
> @@ -23,4 +23,76 @@
>  		device_type = "memory";
>  		reg = <0x40000000 0x20000000>;
>  	};
> +
> +	i2cmux@4 {
> +		compatible = "i2c-mux-reg";
> +		i2c-parent = <&i2c4>;
> +		reg = <0xd1000074 1>;

Did you check this? `dtbs_check` and `dtbs W=1`? Reg looks different
than unit.

> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		i2c4@1 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

i2c@

> +			reg = <1>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +> +		i2c4@3 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +			reg = <3>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +
> +		i2c4@4 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +			reg = <4>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +	};
> +
> +	i2cmux@6 {
> +		compatible = "i2c-mux-reg";
> +		i2c-parent = <&i2c6>;
> +		reg = <0xd1000076 1>;

Same question.

> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		i2c6@1 {

and so on...

> +			reg = <1>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +
> +		i2c6@2 {
> +			reg = <2>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +
> +		i2c6@3 {
> +			reg = <3>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +
> +		i2c6@4 {
> +			reg = <4>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +
> +		i2c6@5 {
> +			reg = <5>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};
> +	};
> +};
> +
> +&i2c2 {
> +	eeprom@50 {
> +		compatible = "atmel,24c02";
> +		pagesize = <8>;
> +		reg = <0x50>;
> +	};
>  };
> diff --git a/arch/arm/boot/dts/hpe-gxp.dtsi b/arch/arm/boot/dts/hpe-gxp.dtsi
> index cf735b3c4f35..27e68932021c 100644
> --- a/arch/arm/boot/dts/hpe-gxp.dtsi
> +++ b/arch/arm/boot/dts/hpe-gxp.dtsi
> @@ -122,6 +122,121 @@
>  				interrupts = <6>;
>  				interrupt-parent = <&vic0>;
>  			};
> +
> +			sysreg_system_controller: syscon@f8 {
> +				compatible = "hpe,gxp-sysreg", "syscon";
> +				reg = <0xf8 0x8>;
> +			};
> +
> +			i2c0: i2c@...0 {
> +				compatible = "hpe,gxp-i2c";
> +				reg = <0x2000 0x70>;
> +				interrupts = <9>;
> +				interrupt-parent = <&vic0>;
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				hpe,sysreg-phandle = <&sysreg_system_controller>;
> +				hpe,i2c-max-bus-freq = <100000>;

Busses should stay disabled in DTSI and only enabled by specific board,
when needed.

> +			};
> +
> +			i2c1: i2c@...0 {
> +				compatible = "hpe,gxp-i2c";
> +				reg = <0x2100 0x70>;
> +				interrupts = <9>;
> +				interrupt-parent = <&vic0>;
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				hpe,sysreg-phandle = <&sysreg_system_controller>;
> +				hpe,i2c-max-bus-freq = <100000>;
> +			};
> +

Best regards,
Krzysztof