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

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Date:   Thu, 03 Oct 2019 09:01:29 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Taniya Das <tdas@...eaurora.org>, 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

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().