linux-kernel - Re: [PATCH 3/3] dt-bindings: ddr: Add bindings for Samsung LPDDR3 memories

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Message-ID: <52963d0d-cf48-7085-5581-a94c6e15e0bd@partner.samsung.com>
Date:   Fri, 6 Sep 2019 13:39:09 +0200
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-pm@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, kgene@...nel.org, mark.rutland@....com,
        robh+dt@...nel.org, Chanwoo Choi <cw00.choi@...sung.com>,
        kyungmin.park@...sung.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com,
        willy.mh.wolff.ml@...il.com
Subject: Re: [PATCH 3/3] dt-bindings: ddr: Add bindings for Samsung LPDDR3
 memories

Hi Krzysztof,

On 9/6/19 12:56 PM, Krzysztof Kozlowski wrote:
> On Fri, 6 Sep 2019 at 12:14, Lukasz Luba <l.luba@...tner.samsung.com> wrote:
>>
>> Add description of bindings for Samsung k3qf2f20db LPDDR3 memory.
>> Minor fixes in the old documentation.
>>
>> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
>> ---
>>   .../devicetree/bindings/ddr/lpddr3.txt        | 29 +++++++++++++++++--
>>   1 file changed, 27 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/ddr/lpddr3.txt b/Documentation/devicetree/bindings/ddr/lpddr3.txt
>> index 3b2485b84b3f..de0905239767 100644
>> --- a/Documentation/devicetree/bindings/ddr/lpddr3.txt
>> +++ b/Documentation/devicetree/bindings/ddr/lpddr3.txt
>> @@ -40,10 +40,34 @@ Child nodes:
>>     a given speed-bin. Please see Documentation/devicetree/
>>     bindings/ddr/lpddr3-timings.txt for more information on "lpddr3-timings"
>>
>> +Samsung K3QF2F20DB LPDDR3 memory
>> +------------------------------------------------------------
>> +
>> +This binding uses the LPDDR3 binding (described above)
>> +
>> +Required properties:
>> +- compatible:  Should be:
>> +               "samsung,K3QF2F20DB"
>> +               followed by "jedec,lpddr3"
>> +- density  : <u32> representing density in Mb (Mega bits)
>> +- io-width : <u32> representing bus width. Possible value 32
>> +- #address-cells: Must be set to 1
>> +- #size-cells: Must be set to 0
> 
> If you decided to repeat all properties again, then it deserves its
> own bindings file. However I though about simpler solution - just
> document compatible. Exactly the same as AT24 or AT25 EEPROM bindings.
> There is not much benefit from copying all these properties.
OK, I see. I will add only 'compatible' and skip the rest then.
So the lpddr3.txt file will get this addition:

+Samsung K3QF2F20DB LPDDR3 memory
+------------------------------------------------------------
+
+This binding uses the LPDDR3 binding (described above)
+
+Required properties:
+- compatible:  Should be:
+               "samsung,K3QF2F20DB"
+               followed by "jedec,lpddr3"
+
+Optional properties:
+
+The optional properties are the same as in the LPDDR3 generic bindings and
+values should be taken from the data-sheet. Detailed bindings are described
+above.
+
+Child nodes:
+
+Detailed bindings are described in LPDDR3 generic bindings described above.
+

Is it OK?

Regards,
Lukasz