Re: [PATCH v3 2/2] arm64: dts: exynos850: Add acpm SRAM node

[Sam Protsenko]

On Mon, Jul 27, 2026 at 8:23 AM Alexey Klimov <alexey.klimov@xxxxxxxxxx> wrote:
>
> SRAM is used by the ACPM protocol to retrieve the ACPM channels
> information and configuration data. Add the SRAM node.
>
> Signed-off-by: Alexey Klimov <alexey.klimov@xxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/exynos/exynos850.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> index 3881f573ec08..0b614caa411c 100644
> --- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> @@ -163,6 +163,11 @@ soc: soc@0 {
>                 #size-cells = <1>;
>                 ranges = <0x0 0x0 0x0 0x20000000>;
>
> +               apm_sram: sram@2039000 {
> +                       compatible = "samsung,exynos850-acpm-sram";
> +                       reg = <0x2039000 0x40000>;

Why it's 0x40000? I checked the TRM, and it says iRAM APM area is from
0x02039000 to 0x02069000, which is 0x30000 (192 KiB). The downstream
kernel (v4.14) also say the APM SRAM size is 0x30000.

> +               };
> +
>                 chipid@10000000 {
>                         compatible = "samsung,exynos850-chipid";
>                         reg = <0x10000000 0x100>;
>
> --
> 2.51.0
>