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

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Message-ID: <20190531040222.GB9641@Mani-XPS-13-9360>
Date:   Fri, 31 May 2019 09:32:22 +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>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: rockchip: Add missing PCIe pwr amd rst
 configuration

Hi,

On Thu, May 30, 2019 at 12:58:37PM +0000, Anand Moon wrote:
> This patch add missing PCIe gpio and pinctrl for power (#PCIE_PWR)
> also add PCIe gpio and pinctrl for reset (#PCIE_PERST_L).
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> Tested on Rock960 Model A
> ---
>  arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
> index c7d48d41e184..f5bef6b0fe89 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
> @@ -55,9 +55,10 @@
>  
>  	vcc3v3_pcie: vcc3v3-pcie-regulator {
>  		compatible = "regulator-fixed";
> +		gpio = <&gpio2 RK_PA2 GPIO_ACTIVE_HIGH>;
>  		enable-active-high;
>  		pinctrl-names = "default";
> -		pinctrl-0 = <&pcie_drv>;
> +		pinctrl-0 = <&pcie_drv &pcie_pwr>;
>  		regulator-boot-on;
>  		regulator-name = "vcc3v3_pcie";
>  		regulator-min-microvolt = <3300000>;
> @@ -381,9 +382,10 @@
>  };
>  
>  &pcie0 {
> +	ep-gpio = <&gpio2 RK_PD4 GPIO_ACTIVE_HIGH>;
>  	num-lanes = <4>;
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&pcie_clkreqn_cpm>;
> +	pinctrl-0 = <&pcie_clkreqn_cpm &pcie_perst_l>;
>  	vpcie3v3-supply = <&vcc3v3_pcie>;
>  	status = "okay";
>  };
> @@ -408,6 +410,16 @@
>  		};
>  	};
>  
> +	pcie {
> +		pcie_pwr: pcie-pwr {
> +			rockchip,pins = <2 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
> +
> +		pcie_perst_l:pcie-perst-l {
> +			rockchip,pins = <2 RK_PD4 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};

Which schematics did you refer? According to Rock960 v2.1 schematics [1], below
is the pin mapping for PCI-E PWR and PERST:

PCIE_PERST - GPIO2_A2
PCIE_PWR - GPIO2_A5

Above mapping holds true for Rock960 version 1.1, 1.2 and 1.3. Also,
rk3399-rock960.dtsi is common for both Rock960 and Ficus boards, so the board
specific parts should go to rk3399-rock960.dts and rk3399-ficus.dts.

Thanks,
Mani

[1] https://dl.vamrs.com/products/rock960/docs/hw/rock960_sch_v12_20180314.pdf
> +	};
> +
>  	sdmmc {
>  		sdmmc_bus1: sdmmc-bus1 {
>  			rockchip,pins =
> -- 
> 2.21.0
>