linux-kernel - Re: [PATCH v3 3/3] clk: qcom: Add Global Clock controller (GCC) driver for SC7180

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Date:   Fri, 4 Oct 2019 23:09:31 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>, robh+dt@...nel.org
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/3] clk: qcom: Add Global Clock controller (GCC)
 driver for SC7180

Hi Stephen,

On 10/3/2019 9:31 PM, Stephen Boyd wrote:
> Quoting Taniya Das (2019-10-03 03:31:15)
>> Hi Stephen,
>>
>> On 10/1/2019 8:08 PM, Stephen Boyd wrote:
>>>
>>> Why do you want to keep them critical and registered? I'm suggesting
>>> that any clk that is marked critical and doesn't have a parent should
>>> instead become a register write in probe to turn the clk on.
>>>
>> Sure, let me do a one-time enable from probe for the clocks which
>> doesn't have a parent.
>> But I would now have to educate the clients of these clocks to remove
>> using them.
>>
> 
> If anyone is using these clks we can return NULL from the provider for
> the specifier so that we indicate there isn't support for them in the
> kernel. At least I hope that code path still works given all the recent
> changes to clk_get().
> 

Could you please confirm if you are referring to update the below?

--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -218,7 +218,7 @@ static struct clk_hw *qcom_cc_clk_hw_get(struct 
of_phandle_args *clkspec,
                 return ERR_PTR(-EINVAL);
         }

-       return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
+       return cc->rclks[idx] ? &cc->rclks[idx]->hw : NULL;
  }


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