Re: [PATCH v2 01/10] phy: qcom-ufs: remove failure when rx/tx_iface_clk are absent

From	Vivek Gautam <vivek.gautam@codeaurora.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 01/10] phy: qcom-ufs: remove failure when rx/tx_iface_clk are absent
Date	2016-10-29 22:30 +0200
Message-ID	<sxIql-2SN-1@gated-at.bofh.it> (permalink)
References	<stDyW-2Sj-5@gated-at.bofh.it> <stDyW-2Sj-27@gated-at.bofh.it> <stJXH-7yE-5@gated-at.bofh.it> <su2QF-4lW-17@gated-at.bofh.it>
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Hi,


On Wed, Oct 19, 2016 at 10:50 PM, Vivek Gautam
<vivek.gautam@codeaurora.org> wrote:
> Hi,
>
>
> On Wed, Oct 19, 2016 at 2:48 AM, Stephen Boyd <sboyd@codeaurora.org> wrote:
>> On 10/18/2016 07:28 AM, Vivek Gautam wrote:
>>> From: Yaniv Gardi <ygardi@codeaurora.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@codeaurora.org>
>>> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.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

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

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Re: [PATCH v2 01/10] phy: qcom-ufs: remove failure when  rx/tx_iface_clk are absent Vivek Gautam <vivek.gautam@codeaurora.org> - 2016-10-29 22:30 +0200

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