Re: [PATCH v1] arm64: dts: rockchip: Add missing pinctrl for PCIe30x4 node

From: "Heiko Stübner" <heiko@sntech.de>
To: Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Anand Moon <linux.amoon@gmail.com>
Cc: Anand Moon <linux.amoon@gmail.com>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] arm64: dts: rockchip: Add missing pinctrl for PCIe30x4 node
Date: Wed, 10 Jul 2024 16:54:07 +0200	[thread overview]
Message-ID: <2356091.ECZNHGQPT7@diego> (raw)
In-Reply-To: <20240710142001.7234-1-linux.amoon@gmail.com>

Hi,

Am Mittwoch, 10. Juli 2024, 16:19:56 CEST schrieb Anand Moon:
> Add missing pinctrl settings for PCIe 3.0 x4 clock request and wake
> signals. Rename node from 'pcie3' to 'pcie30x4' to align with schematic
> nomenclature.
> 
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
>  .../boot/dts/rockchip/rk3588-rock-5b.dts      | 20 +++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> index 2e7512676b7e..a9b55b7996cf 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> @@ -301,7 +301,7 @@ &pcie30phy {
>  
>  &pcie3x4 {
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&pcie3_rst>;
> +	pinctrl-0 = <&pcie30x4_perstn_m1 &pcie30x4_clkreqn_m1 &pcie30x4_waken_m1>;
>  	reset-gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_HIGH>;
>  	vpcie3v3-supply = <&vcc3v3_pcie30>;
>  	status = "okay";
> @@ -340,14 +340,22 @@ pcie2_2_rst: pcie2-2-rst {
>  		};
>  	};
>  
> -	pcie3 {
> -		pcie3_rst: pcie3-rst {
> -			rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
> -		};
> -
> +	pcie30x4 {
>  		pcie3_vcc3v3_en: pcie3-vcc3v3-en {
>  			rockchip,pins = <1 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;
>  		};
> +
> +		pcie30x4_clkreqn_m1: pcie30x4-clkreqn-m1 {
> +			rockchip,pins = <4 RK_PB4 RK_FUNC_GPIO &pcfg_pull_up>;
> +		};
> +
> +		pcie30x4_waken_m1: pcie30x4-waken-m1 {
> +			rockchip,pins = <4 RK_PB5 RK_FUNC_GPIO &pcfg_pull_down>;
> +		};
> +
> +		pcie30x4_perstn_m1: pcie30x4-perstn-m1 {
> +			rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_down>;
> +		};

I'm not sure what you're going for here, but defining them as gpio makes
them essentially unused? Shouldn't they go to the pcie controller?

From what I found for example
The PERST# signal is used to indicate when the power supply is within its specified voltage tolerance and is stable.

At least you'll need to explain more in the commit message.

Heiko

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