Re: [PATCH v2] arm64: dts: broadcom: bcm2712-rpi-5-b: add spi0 interface

[Andrea della Porta]

Hi Gregor,

On 11:24 Fri 04 Sep     , Gregor Herburger wrote:
> The Raspberry Pi 5 routes the spi0 of the rp1 chip to the pin header.
> Add the rp1_spi0 node and its pinctrl node to the devicetree to enable
> the spi interface.

Just a nit-pick: in the comment it's stated that the spi interface is enabled,
which is not true since rp1_usb inherit status="disabled" from its node
definition. This is fine because the user would probably want to enable the
spi interface through some overlay, so no need to resend the patch (at least
for me), so:

Reviewed-by: Andrea della Porta <andrea.porta@xxxxxxxx>

Thanks!

Andrea

> 
> Signed-off-by: Gregor Herburger <gregor.herburger@xxxxxxxxxxxxx>
> ---
> The RP1 chip, found on the raspberry Pi 5, has nine spi controllers. The
> spi0 is routed to the pin header. Add the rp1 nodes and enable it for
> the Raspberry Pi 5.
> ---
> Changes in v2:
> - Drop first patch as it got already applied: https://lore.kernel.org/lkml/20260903194624.2038562-1-florian.fainelli@xxxxxxxxxxxx/
> - add cs gpios to rp1_gpio for pinctrl
> - Link to v1: https://patch.msgid.link/20260811-bcm2712-spi-v1-0-4c1708d354bb@xxxxxxxxxxxxx
> ---
>  arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
> index 0fc57e72632ed..0de3d78100a5d 100644
> --- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
> +++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
> @@ -69,6 +69,20 @@ usb_vbus_default_state: usb-vbus-default-state {
>  		groups = "vbus1";
>  	};
>  
> +	rp1_spi0_default_state: rp1-spi0-default-state {
> +		function = "spi0";
> +		groups = "spi0";
> +		bias-disable;
> +		drive-strength = <12>;
> +		slew-rate = <1>;
> +	};
> +
> +	rp1_spi0_cs_default_state: rp1-spi0-cs-default-state {
> +		function = "gpio";
> +		pins = "gpio7", "gpio8";
> +		bias-pull-up;
> +	};
> +
>  	rp1_i2c4_default_state: rp1-i2c4-default-state {
>  		function = "i2c4";
>  		groups = "i2c4_2";
> @@ -94,6 +108,14 @@ &rp1_i2c6 {
>  	pinctrl-names = "default";
>  };
>  
> +&rp1_spi0 {
> +	pinctrl-0 = <&rp1_spi0_default_state &rp1_spi0_cs_default_state>;
> +	pinctrl-names = "default";
> +
> +	num-cs = <2>;
> +	cs-gpios = <&rp1_gpio 8 GPIO_ACTIVE_LOW &rp1_gpio 7 GPIO_ACTIVE_LOW>;
> +};
> +
>  &rp1_usb0 {
>  	pinctrl-0 = <&usb_vbus_default_state>;
>  	pinctrl-names = "default";
> 
> ---
> base-commit: db2ddb87143519e20a95aa36c60b36107b736a58
> change-id: 20260811-bcm2712-spi-644b70fee3bf
> 
> Best regards,
> --  
> Gregor Herburger <gregor.herburger@xxxxxxxxxxxxx>
>