linux-kernel - Re: [PATCH v2] arm64: dts: rockchip: Add missing configuration pwr amd rst for PCIe

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Date:   Sat, 1 Jun 2019 15:21:06 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Vicente Bergas <vicencb@...il.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: rockchip: Add missing configuration pwr
 amd rst for PCIe

Hi,

On Fri, May 31, 2019 at 08:19:13PM +0000, Anand Moon wrote:
> This patch add missing PCIe gpio pin (#PCIE_PWR) for vcc3v3_pcie power
> regulator node also add missing reset pinctrl (#PCIE_PERST_L) for PCIe node.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> using schematics: thanks for suggested by Manivannan
> [1] https://dl.vamrs.com/products/rock960/docs/hw/rock960_sch_v12_20180314.pdf
> 
> Changes from prevoius patch:
> [2] https://patchwork.kernel.org/patch/10968695/
> 
> Fix the suject and commit message and corrected the PWR and PERST configuration
> as per shematics and dts nodes.
> ---
>  arch/arm64/boot/dts/rockchip/rk3399-ficus.dts    | 7 +++++++
>  arch/arm64/boot/dts/rockchip/rk3399-rock960.dts  | 7 +++++++
>  arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi | 3 +--
>  3 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts b/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts
> index 6b059bd7a04f..94e2a59bc1c7 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts
> @@ -89,6 +89,8 @@
>  
>  &pcie0 {
>  	ep-gpios = <&gpio4 RK_PD4 GPIO_ACTIVE_HIGH>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pcie_clkreqn_cpm &pcie_perst_l>;

Looks like ep-gpio is wrong here :/ I probably referred old schematics
at that time. Correct pin mapping is,

ep-gpios = <&gpio2 RK_PD4 GPIO_ACTIVE_HIGH>;

And this should be fixed in a separate patch with "Fixes" tag!

>  };
>  
>  &pinctrl {
> @@ -104,6 +106,11 @@
>  			rockchip,pins =
>  				<1 RK_PD0 RK_FUNC_GPIO &pcfg_pull_none>;
>  			};
> +
> +		pcie_perst_l: pcie-perst-l {
> +			rockchip,pins =
> +				<4 RK_PD4 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
>  	};
>  
>  	usb2 {
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dts b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dts
> index 12285c51cceb..665fe09c7c74 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dts
> @@ -64,6 +64,8 @@
>  
>  &pcie0 {
>  	ep-gpios = <&gpio2 RK_PA2 GPIO_ACTIVE_HIGH>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pcie_clkreqn_cpm &pcie_perst_l>;
>  };
>  
>  &pinctrl {
> @@ -104,6 +106,11 @@
>  			rockchip,pins =
>  				<2 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>;
>  			};
> +
> +		pcie_perst_l: pcie-perst-l {
> +			rockchip,pins =
> +				<2 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
>  	};
>  
>  	usb2 {
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
> index c7d48d41e184..3df0cd67b4b2 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
> @@ -55,6 +55,7 @@
>  
>  	vcc3v3_pcie: vcc3v3-pcie-regulator {
>  		compatible = "regulator-fixed";
> +		gpio = <&gpio2 RK_PA5 GPIO_ACTIVE_HIGH>;

Actually the PWR pin mapping is defined in a separate node for both Rock960
and Ficus in respective dts. So defining it here would be wrong as the PWR
pin mapping is different for both boards.

Thanks,
Mani

>  		enable-active-high;
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&pcie_drv>;
> @@ -382,8 +383,6 @@
>  
>  &pcie0 {
>  	num-lanes = <4>;
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pcie_clkreqn_cpm>;
>  	vpcie3v3-supply = <&vcc3v3_pcie>;
>  	status = "okay";
>  };
> -- 
> 2.21.0
>