linux-kernel - Re: [PATCH 1/3] ARM: dts: imx: add nvmem property for cpu0

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Message-ID: <20200311083052.GD29269@dragon>
Date:   Wed, 11 Mar 2020 16:30:52 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     peng.fan@....com
Cc:     viresh.kumar@...aro.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        Anson.Huang@....com, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] ARM: dts: imx: add nvmem property for cpu0

On Tue, Mar 03, 2020 at 10:14:48AM +0800, peng.fan@....com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Add nvmem related property for cpu0, then nvmem API could be used
> to read cpu speed grading to avoid directly read OCOTP registers
> mapped which could not handle defer probe.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  arch/arm/boot/dts/imx6dl.dtsi  | 2 ++
>  arch/arm/boot/dts/imx6q.dtsi   | 2 ++
>  arch/arm/boot/dts/imx6qdl.dtsi | 7 +++++++
>  arch/arm/boot/dts/imx6sl.dtsi  | 9 +++++++++
>  arch/arm/boot/dts/imx6sll.dtsi | 6 ++++++
>  arch/arm/boot/dts/imx6sx.dtsi  | 6 ++++++
>  6 files changed, 32 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx6dl.dtsi b/arch/arm/boot/dts/imx6dl.dtsi
> index 4b3a128d9260..055f1d875bac 100644
> --- a/arch/arm/boot/dts/imx6dl.dtsi
> +++ b/arch/arm/boot/dts/imx6dl.dtsi
> @@ -44,6 +44,8 @@
>  			arm-supply = <&reg_arm>;
>  			pu-supply = <&reg_pu>;
>  			soc-supply = <&reg_soc>;
> +			nvmem-cells = <&cpu_speed_grade>;
> +			nvmem-cell-names = "speed_grade";
>  		};
>  
>  		cpu@1 {
> diff --git a/arch/arm/boot/dts/imx6q.dtsi b/arch/arm/boot/dts/imx6q.dtsi
> index 0fad13f9d336..d3ba9d4a1290 100644
> --- a/arch/arm/boot/dts/imx6q.dtsi
> +++ b/arch/arm/boot/dts/imx6q.dtsi
> @@ -49,6 +49,8 @@
>  			arm-supply = <&reg_arm>;
>  			pu-supply = <&reg_pu>;
>  			soc-supply = <&reg_soc>;
> +			nvmem-cells = <&cpu_speed_grade>;
> +			nvmem-cell-names = "speed_grade";
>  		};
>  
>  		cpu1: cpu@1 {
> diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
> index 70fb8b56b1d7..982f546b0b89 100644
> --- a/arch/arm/boot/dts/imx6qdl.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl.dtsi
> @@ -1165,6 +1165,13 @@
>  				compatible = "fsl,imx6q-ocotp", "syscon";
>  				reg = <0x021bc000 0x4000>;
>  				clocks = <&clks IMX6QDL_CLK_IIM>;
> +

Please drop such newline.  Do not really think they are necessary.

Shawn

> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +
> +				cpu_speed_grade: speed-grade@10 {
> +					reg = <0x10 4>;
> +				};
>  			};
>  
>  			tzasc@...0000 { /* TZASC1 */
> diff --git a/arch/arm/boot/dts/imx6sl.dtsi b/arch/arm/boot/dts/imx6sl.dtsi
> index c8ec46fe8302..de943341e4f2 100644
> --- a/arch/arm/boot/dts/imx6sl.dtsi
> +++ b/arch/arm/boot/dts/imx6sl.dtsi
> @@ -74,6 +74,8 @@
>  			arm-supply = <&reg_arm>;
>  			pu-supply = <&reg_pu>;
>  			soc-supply = <&reg_soc>;
> +			nvmem-cells = <&cpu_speed_grade>;
> +			nvmem-cell-names = "speed_grade";
>  		};
>  	};
>  
> @@ -953,6 +955,13 @@
>  				compatible = "fsl,imx6sl-ocotp", "syscon";
>  				reg = <0x021bc000 0x4000>;
>  				clocks = <&clks IMX6SL_CLK_OCOTP>;
> +
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +
> +				cpu_speed_grade: speed-grade@10 {
> +					reg = <0x10 4>;
> +				};
>  			};
>  
>  			audmux: audmux@...8000 {
> diff --git a/arch/arm/boot/dts/imx6sll.dtsi b/arch/arm/boot/dts/imx6sll.dtsi
> index 797f850492fe..6b7fb3cec9f6 100644
> --- a/arch/arm/boot/dts/imx6sll.dtsi
> +++ b/arch/arm/boot/dts/imx6sll.dtsi
> @@ -72,6 +72,8 @@
>  				 <&clks IMX6SLL_CLK_PLL1_SYS>;
>  			clock-names = "arm", "pll2_pfd2_396m", "step",
>  				      "pll1_sw", "pll1_sys";
> +			nvmem-cells = <&cpu_speed_grade>;
> +			nvmem-cell-names = "speed_grade";
>  		};
>  	};
>  
> @@ -791,6 +793,10 @@
>  				reg = <0x021bc000 0x4000>;
>  				clocks = <&clks IMX6SLL_CLK_OCOTP>;
>  
> +				cpu_speed_grade: speed-grade@10 {
> +					reg = <0x10 4>;
> +				};
> +
>  				tempmon_calib: calib@38 {
>  					reg = <0x38 4>;
>  				};
> diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
> index e47d346a3543..63aa19d81b42 100644
> --- a/arch/arm/boot/dts/imx6sx.dtsi
> +++ b/arch/arm/boot/dts/imx6sx.dtsi
> @@ -87,6 +87,8 @@
>  				      "pll1_sw", "pll1_sys";
>  			arm-supply = <&reg_arm>;
>  			soc-supply = <&reg_soc>;
> +			nvmem-cells = <&cpu_speed_grade>;
> +			nvmem-cell-names = "speed_grade";
>  		};
>  	};
>  
> @@ -1058,6 +1060,10 @@
>  				reg = <0x021bc000 0x4000>;
>  				clocks = <&clks IMX6SX_CLK_OCOTP>;
>  
> +				cpu_speed_grade: speed-grade@10 {
> +					reg = <0x10 4>;
> +				};
> +
>  				tempmon_calib: calib@38 {
>  					reg = <0x38 4>;
>  				};
> -- 
> 2.16.4
>