linux-kernel - Re: [PATCH 06/13] arm64: dts: ti: k3-j7200: Enable OSPI nodes at the board level

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Date:   Mon, 7 Aug 2023 10:49:27 +0530
From:   Dhruva Gole <d-gole@...com>
To:     Andrew Davis <afd@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/13] arm64: dts: ti: k3-j7200: Enable OSPI nodes at the
 board level



On 03/08/23 02:23, Andrew Davis wrote:
> OSPI nodes defined in the top-level J7200 SoC dtsi files are incomplete
> and may not be functional unless they are extended with pinmux and
> device information.
> 
> As the attached OSPI device is only known about at the board integration
> level, these nodes should only be enabled when provided with this
> information.

Agree

> 
> Disable the OSPI nodes in the dtsi files and only enable the ones that
> are actually pinned out on a given board.
> 
> Signed-off-by: Andrew Davis <afd@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi | 1 +
>   arch/arm64/boot/dts/ti/k3-j7200-som-p0.dtsi     | 1 +
>   2 files changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
> index ee7860913c387..571eb0e2eac92 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
> @@ -544,6 +544,7 @@ ospi0: spi@...40000 {
>   			power-domains = <&k3_pds 103 TI_SCI_PD_EXCLUSIVE>;
>   			#address-cells = <1>;
>   			#size-cells = <0>;
> +			status = "disabled";
>   		};
>   	};
>   
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-som-p0.dtsi b/arch/arm64/boot/dts/ti/k3-j7200-som-p0.dtsi
> index b37f4f88ece4f..5a300d4c8ba03 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200-som-p0.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j7200-som-p0.dtsi
> @@ -267,6 +267,7 @@ eeprom@50 {
>   };
>   
>   &ospi0 {
> +	status = "okay";

Reviewed-by: Dhruva Gole <d-gole@...com>

>   	pinctrl-names = "default";
>   	pinctrl-0 = <&mcu_fss0_ospi0_pins_default>;
>   

-- 
Thanks and Regards,
Dhruva Gole