linux-kernel - Re: [RFC PATCH 6/6] ARM64: exynos: add the pcie node for TM2

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Date:   Tue, 27 Dec 2016 18:32:00 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        bhelgaas@...gle.com, robh+dt@...nel.org, mark.rutland@....com,
        kgene@...nel.org, krzk@...nel.org, javier@....samsung.com,
        kishon@...com, will.deacon@....com, catalin.marinas@....com,
        cpgs@...sung.com
Subject: Re: [RFC PATCH 6/6] ARM64: exynos: add the pcie node for TM2

On Mon, Dec 26, 2016 at 02:20:29PM +0900, Jaehoon Chung wrote:
> Add the Exxynos5433 pcie node for TM2.
> This pcie device is used for supporting WiFi.
> 
> And some gpios are already requested from pinctrl. so it doesn't need to
> initialize.
> GPJ2-0 is used for supplying to WiFi PCIe chip.
> 
> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> ---
>  arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi |  7 +++++++
>  arch/arm64/boot/dts/exynos/exynos5433-tm2.dts      | 11 +++++++++--
>  arch/arm64/boot/dts/exynos/exynos5433.dtsi         | 23 ++++++++++++++++++++++
>  3 files changed, 39 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
> index ad71247..3e8b728 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
> @@ -183,6 +183,13 @@
>  		interrupt-controller;
>  		#interrupt-cells = <2>;
>  	};
> +
> +	pcie_wlanen: pcie-wlanen {
> +		samsung,pins = "gpj2-0";
> +		samsung,pin-function = <0>;
> +		samsung,pin-pud = <3>;
> +		samsung,pin-drv = <3>;
> +	};
>  };
>  
>  &pinctrl_finger {
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
> index f21bdc2..c84a2ad 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
> @@ -737,6 +737,15 @@
>  	bus-width = <4>;
>  };
>  
> +&pcie {
> +	assigned-clocks = <&cmu_fsys CLK_MOUT_SCLK_PCIE_100_USER>,
> +			<&cmu_top CLK_MOUT_SCLK_PCIE_100>;
> +	assigned-clock-parents = <&cmu_top CLK_SCLK_PCIE_100_FSYS>,
> +			<&cmu_top CLK_MOUT_BUS_PLL_USER>;
> +	assigned-clock-rates = <0>, <100000000>;
> +	status = "okay";
> +};
> +
>  &pinctrl_alive {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&initial_alive>;
> @@ -836,7 +845,6 @@
>  	pinctrl-0 = <&initial_ese>;
>  
>  	initial_ese: initial-state {
> -		PIN(IN, gpj2-0, DOWN, LV1);
>  		PIN(IN, gpj2-1, DOWN, LV1);
>  		PIN(IN, gpj2-2, DOWN, LV1);
>  	};
> @@ -851,7 +859,6 @@
>  		PIN(IN, gpr3-1, DOWN, LV1);
>  		PIN(IN, gpr3-2, DOWN, LV1);
>  		PIN(IN, gpr3-3, DOWN, LV1);
> -		PIN(IN, gpr3-7, NONE, LV1);
>  	};
>  };
>  
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433.dtsi b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
> index 2a15f18..da287f4 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
> @@ -1457,6 +1457,29 @@
>  			samsung,fsys-sysreg = <&syscon_fsys>;
>  			status = "okay";
>  		};
> +
> +		pcie: pcie@...00000 {
> +			compatible = "samsung,exynos5433-pcie", "snps,dw-pcie";
> +			#address-cells = <3>;
> +			#size-cells = <2>;
> +			device_type = "pci";
> +			interrupts = <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "intr";
> +			clocks = <&cmu_fsys CLK_PCIE>,
> +			       <&cmu_fsys CLK_PCLK_PCIE_PHY>;

Here and in the 'reg' property - indentation looks weird. Tabs+spaces
but not aligned. Either you use spaces to align... or just don't care
and use tabs. I prefer consistency and below the 'ranges' property is
aligned.

> +			clock-names = "pcie", "pcie_bus";
> +			num-lanes = <1>;
> +			pinctrl-names = "default";
> +			phys = <&pcie_phy>;
> +			phy-names = "pcie-phy";
> +			pinctrl-0 = <&pcie_bus &pcie_wlanen>;
> +			reg = <0x156b0000 0x1000>, <0x15700000 0x1000>,
> +			    <0x0c000000 0x1000>;
> +			reg-names = "elbi", "dbi", "config";

This does not match the bindings documentation.

Best regards,
Krzysztof