linux-kernel - Re: [PATCH v3 14/21] ARM: dts: microchip: sama7d65: Add SRAM and DRAM components support

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Message-ID: <3bdac1bc-b84f-43b0-86be-b9d9b18be25f@tuxon.dev>
Date: Mon, 3 Mar 2025 10:28:36 +0200
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Ryan.Wanner@...rochip.com, lee@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, sre@...nel.org,
 nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
 p.zabel@...gutronix.de
Cc: linux@...linux.org.uk, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH v3 14/21] ARM: dts: microchip: sama7d65: Add SRAM and DRAM
 components support

Hi, Ryan,

On 27.02.2025 17:52, Ryan.Wanner@...rochip.com wrote:
> From: Ryan Wanner <Ryan.Wanner@...rochip.com>
> 
> Add SRAM, secumod, UDDRC, and DDR3phy to enable support for low power modes.
> 
> Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
> ---
>  arch/arm/boot/dts/microchip/sama7d65.dtsi | 35 +++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
> index 92a5347e35b5..c10cc3558efd 100644
> --- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
> +++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
> @@ -47,12 +47,37 @@ slow_xtal: clock-slowxtal {
>  		};
>  	};
>  
> +	ns_sram: sram@...000 {
> +		compatible = "mmio-sram";
> +		reg = <0x100000 0x20000>;
> +		ranges;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +	};
> +
>  	soc {
>  		compatible = "simple-bus";
>  		ranges;
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  
> +		securam: sram@...00800 {
> +			compatible = "microchip,sama7d65-securam", "atmel,sama5d2-securam", "mmio-sram";
> +			reg = <0xe0000800 0x4000>;
> +			ranges = <0 0xe0000800 0x4000>;
> +			clocks = <&pmc PMC_TYPE_PERIPHERAL 17>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			no-memory-wc;
> +		};
> +
> +		secumod: secumod@...04000 {
> +			compatible = "microchip,sama7d65-secumod", "atmel,sama5d2-secumod", "syscon";

microchip,sama7d65-secumod is undocumented. I'll postpone this until a
documentation a patch will be posted.

> +			reg = <0xe0004000 0x4000>;
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +		};
> +
>  		pioa: pinctrl@...14000 {
>  			compatible = "microchip,sama7d65-pinctrl", "microchip,sama7g5-pinctrl";
>  			reg = <0xe0014000 0x800>;
> @@ -190,6 +215,16 @@ i2c10: i2c@600 {
>  			};
>  		};
>  
> +		uddrc: uddrc@...00000 {
> +			compatible = "microchip,sama7d65-uddrc", "microchip,sama7g5-uddrc";
> +			reg = <0xe3800000 0x4000>;
> +		};
> +
> +		ddr3phy: ddr3phy@...04000 {
> +			compatible = "microchip,sama7d65-ddr3phy", "microchip,sama7g5-ddr3phy";
> +			reg = <0xe3804000 0x1000>;
> +		};
> +
>  		gic: interrupt-controller@...11000 {
>  			compatible = "arm,cortex-a7-gic";
>  			reg = <0xe8c11000 0x1000>,