linux-kernel - Re: [PATCH v3] arm64: dts: qcom: db845c: Add support for MCP2517FD

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Date:   Thu, 21 Apr 2022 18:30:57 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arm64: dts: qcom: db845c: Add support for MCP2517FD

On Thu, Apr 21, 2022 at 01:04:38PM +0530, Vinod Koul wrote:
> Add support for onboard MCP2517FD SPI CAN transceiver attached to
> SPI0 of RB3.
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>

One comment below but irrespective of that,

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
> Change in v3:
>  - change underscore(_) to dash (-) in can-clock node name
>  - remove superfluous status = okay in can node
> 
> Changes in v2:
>  - add cs and pinctrl config
>  - remove misleading comment
> 
>  arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 32 ++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> index 28fe45c5d516..d2ade684703d 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> @@ -28,6 +28,13 @@ chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
>  
> +	/* Fixed crystal oscillator dedicated to MCP2517FD */
> +	clk40M: can-clock {

clock@?

> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <40000000>;
> +	};
> +
>  	dc12v: dc12v-regulator {
>  		compatible = "regulator-fixed";
>  		regulator-name = "DC12V";
> @@ -746,6 +753,23 @@ codec {
>  	};
>  };
>  
> +&spi0 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&qup_spi0_default>;
> +	cs-gpios = <&tlmm 3 GPIO_ACTIVE_LOW>;
> +
> +	can@0 {
> +		compatible = "microchip,mcp2517fd";
> +		reg = <0>;
> +		clocks = <&clk40M>;
> +		interrupts-extended = <&tlmm 104 IRQ_TYPE_LEVEL_LOW>;
> +		spi-max-frequency = <10000000>;
> +		vdd-supply = <&vdc_5v>;
> +		xceiver-supply = <&vdc_5v>;
> +	};
> +};
> +
>  &spi2 {
>  	/* On Low speed expansion */
>  	label = "LS-SPI0";
> @@ -1219,3 +1243,11 @@ ov7251_ep: endpoint {
>  		};
>  	};
>  };
> +
> +/* PINCTRL - additions to nodes defined in sdm845.dtsi */
> +&qup_spi0_default {
> +	config {
> +		drive-strength = <6>;
> +		bias-disable;
> +	};
> +};
> -- 
> 2.34.1
>