linux-kernel - Re: [PATCH v2 01/10] phy: qcom-ufs: remove failure when rx/tx_iface

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Message-ID: <CAFp+6iFyAVXakdLM0C8pkg4MJEyah3KEK-7631k-i5_r+F8CvA@mail.gmail.com>
Date:   Sun, 30 Oct 2016 01:51:41 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     kishon <kishon@...com>, jejb@...ux.vnet.ibm.com,
        Vinayak Holikatti <vinholikatti@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        linux-scsi@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Yaniv Gardi <ygardi@...eaurora.org>
Subject: Re: [PATCH v2 01/10] phy: qcom-ufs: remove failure when
 rx/tx_iface_clk are absent

Hi,


On Wed, Oct 19, 2016 at 10:50 PM, Vivek Gautam
<vivek.gautam@...eaurora.org> wrote:
> Hi,
>
>
> On Wed, Oct 19, 2016 at 2:48 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>> On 10/18/2016 07:28 AM, Vivek Gautam wrote:
>>> From: Yaniv Gardi <ygardi@...eaurora.org>
>>>
>>> Since in future UFS Phy's the tx_iface_clk and rx_iface_clk
>>> are no longer exist, we should not fail when their initialization
>>> fail, but rather just report with debug message.
>>>
>>> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>>> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
>>> ---
>>
>> Shouldn't we have a different compatible string on future UFS phys so
>> that we know which number of clks and what clks are required? That's how
>> we typically handle clk configurations changing. Making them optional
>> should really only be needed when they're really optional, i.e. things
>> will work fine if they're there or not.
>
> Correct. It makes sense to have different compatible strings for different
> versions.
> I will gather more information about previous versions that required
> this clock, and update as suggested.

The tx/rx_face clocks are not available on some of the recent chips,
such as msm8996. Older chips with this 14nm ufs phy had handles
for tx/rx_iface clocks.
So, i will add new compatible string for msm8996 -
"qcom,msm8996-ufs-phy-qmp-14nm"
This can be used with chips further on that are going to use the same ufs phy.


Regards
Vivek

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