linux-kernel - Re: [PATCH v3 1/4] dt-bindings: phy: Add support for QUSB2 phy

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Message-ID: <CAFp+6iE+7ta4dwNBj59Nro+kGWHuERNEj0gwF9AkfFvcy7oxWQ@mail.gmail.com>
Date:   Wed, 28 Dec 2016 11:10:02 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Rob Herring <robh@...nel.org>, kishon <kishon@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 1/4] dt-bindings: phy: Add support for QUSB2 phy

On Wed, Dec 28, 2016 at 6:43 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> On 12/22/2016 08:52 PM, Vivek Gautam wrote:
>>
>>>> +
>>>> +Optional properties:
>>>> + - nvmem-cells: a list of phandles to nvmem cells that contain fused
>>>> +             tuning parameters for qusb2 phy, one for each entry
>>>> +             in nvmem-cell-names.
>>>> + - nvmem-cell-names: must be "tune2_hstx_trim" for cell containing
>>>> +                  HS Tx trim value.
>>> ditto.
>> nvmem doesn't allow, at this point, to get the cells by index.
>> Its APIs take 'const char' cell id and get the cell.
>>
>> We should add this support to get the cell by index.
>> Will create a patch for that, and drop the '-names' property from bindings.
>>
>
> If we introduce a cells based API just for this case of one phandle it
> may make sense to allow the cell id to be NULL and default to whatever
> cell is there without a names property. We do something similar with
> clks where a NULL connection id defaults to the first phandle in the
> list. Then we can avoid having a new set of DT specific APIs here. Of
> course, documentation should be updated to indicate that a NULL cell_id
> means use index 0 with DT.

Right. This makes sense. I didn't notice that we do something
similar in clocks.
I will post a new change for this (which should be pretty small
in comparison to earlier patchset that introduced new dt based APIs).

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Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project