linux-kernel - Re: [PATCH v4 5/6] ARM: rockchip: Add pmu-sram binding

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Date:	Wed, 22 Oct 2014 17:09:44 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Mike Turquette <mturquette@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	linux-rockchip@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Tony Xie <xxx@...k-chips.com>
Subject: Re: [PATCH v4 5/6] ARM: rockchip: Add pmu-sram binding

Chris,

On Tue, Oct 21, 2014 at 4:26 PM, Chris Zhong <zyw@...k-chips.com> wrote:
> The pmu-sram is used to store resume code, suspend/resume need get the
> address of it. Therefore add a binding and documentation for it.
>
> Signed-off-by: Tony Xie <xxx@...k-chips.com>
> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
>  .../devicetree/bindings/arm/rockchip/pmu-sram.txt  |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/rockchip/pmu-sram.txt
>
> diff --git a/Documentation/devicetree/bindings/arm/rockchip/pmu-sram.txt b/Documentation/devicetree/bindings/arm/rockchip/pmu-sram.txt
> new file mode 100644
> index 0000000..77284c0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/rockchip/pmu-sram.txt
> @@ -0,0 +1,15 @@
> +Rockchip SRAM for pmu:
> +------------------------------
> +
> +The sram of pmu is used to store the function of resume from maskrom(the 1st
> +level loader).

It's probably best in this document to say that this is a common use
of the "pmu-sram" because it keeps power even in low power states in
the system.  ...this SRAM could be used for other things as well.


> +Required node properties:
> +- compatible : should be "rockchip,rk3288-pmu-sram"
> +- reg : physical base address and the size of the registers window
> +
> +Example:
> +       pmu_intmem@...20000 {
> +               compatible = "rockchip,rk3288-pmu-sram", "mmio-sram";
> +               reg = <0xff720000 0x4000>;

As with the other patch, should probably change the size in the
example to 0x1000 (4K).

Otherwise this looks good to me.

-Doug
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