linux-kernel - Re: [PATCH v7 05/13] dt-bindings: ddr: add LPDDR3 memories

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Date:   Tue, 7 May 2019 12:00:04 -0500
From:   Rob Herring <robh@...nel.org>
To:     Lukasz Luba <l.luba@...tner.samsung.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        b.zolnierkie@...sung.com, krzk@...nel.org, kgene@...nel.org,
        cw00.choi@...sung.com, kyungmin.park@...sung.com,
        m.szyprowski@...sung.com, s.nawrocki@...sung.com,
        myungjoo.ham@...sung.com, keescook@...omium.org, tony@...mide.com,
        jroedel@...e.de, treding@...dia.com, digetx@...il.com,
        willy.mh.wolff.ml@...il.com
Subject: Re: [PATCH v7 05/13] dt-bindings: ddr: add LPDDR3 memories

On Mon, May 06, 2019 at 05:11:53PM +0200, Lukasz Luba wrote:
> Specifies the AC timing parameters of the LPDDR3 memory device.
> 
> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
> ---
>  .../devicetree/bindings/ddr/lpddr3-timings.txt     | 58 +++++++++++++
>  Documentation/devicetree/bindings/ddr/lpddr3.txt   | 97 ++++++++++++++++++++++
>  2 files changed, 155 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ddr/lpddr3-timings.txt
>  create mode 100644 Documentation/devicetree/bindings/ddr/lpddr3.txt
> 
> diff --git a/Documentation/devicetree/bindings/ddr/lpddr3-timings.txt b/Documentation/devicetree/bindings/ddr/lpddr3-timings.txt
> new file mode 100644
> index 0000000..3a2ef3a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ddr/lpddr3-timings.txt
> @@ -0,0 +1,58 @@
> +* AC timing parameters of LPDDR3 memories for a given speed-bin.
> +
> +The structures are based on LPDDR2 and extended where needed.
> +
> +Required properties:
> +- compatible : Should be "jedec,lpddr3-timings"
> +- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32>
> +- reg : maximum DDR clock frequency for the speed-bin. Type is <u32>
> +
> +Optional properties:
> +
> +The following properties represent AC timing parameters from the memory
> +data-sheet of the device for a given speed-bin. All these properties are
> +of type <u32> and the default unit is ps (pico seconds).
> +- tRFC
> +- tRRD
> +- tRPab
> +- tRPpb
> +- tRCD
> +- tRC
> +- tRAS
> +- tWTR
> +- tWR
> +- tRTP
> +- tW2W-C2C
> +- tR2R-C2C
> +- tFAW
> +- tXSR
> +- tXP
> +- tCKE
> +- tCKESR
> +- tMRD
> +
> +Example:
> +
> +timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@0 {

Now the unit-address should be @800000000

With that and the other example fixed,

Reviewed-by: Rob Herring <robh@...nel.org>

> +	compatible	= "jedec,lpddr3-timings";
> +	reg		= <800000000>; /* workaround: it shows max-freq */
> +	min-freq	= <100000000>;