linux-kernel - Re: [PATCH V2] clk: hi6220: Add the hi655x's pmic clock

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Date:   Wed, 19 Apr 2017 21:47:37 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     mturquette@...libre.com, lee.jones@...aro.org,
        xuwei5@...ilicon.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH V2] clk: hi6220: Add the hi655x's pmic clock

On Wed, Apr 19, 2017 at 09:00:05AM -0700, Stephen Boyd wrote:
> On 04/16, Daniel Lezcano wrote:
> > On Wed, Apr 12, 2017 at 08:02:45AM -0700, Stephen Boyd wrote:
> > > On 04/08, Daniel Lezcano wrote:

[ ... ]

> > > > +	ret = clk_hw_register_clkdev(&hi655x_clk->clk_hw, clk_name, NULL);
> > > 
> > > Missed this last time. Do you use this clkdev lookup? The name is
> > > usually supposed to be based on what the device is expecting,
> > > instead of clk_name, and we would want some device name for the
> > > third argument here.
> > 
> > I'm not sure to get your comment. Are you saying the clk_name should be the
> > third argument?
> > 
> > 
> 
> Sorry, no. I meant that con_id is typically something like "core"
> or "ahb" or something like that, and dev_id is something like
> "a456002.pmic_device" or whatever dev_name(pmic_dev) would return for
> the consuming device. That way when we call clk_get(dev, "core")
> it will find the lookup with "core" and "a456002.pmic_device" to
> match up the clk lookup.
> 
> If anything, the clk_name should just go into the con_id for now,
> and then it will need to be a globally unique identifier for the
> clk. But that is going against how clkdev is supposed to be used.
> Hence the question if you even need to use it. If not, just don't
> add it. I can fix up v3 of this patch to put clk_name back at
> con_id if you like. No need to resend.

Ok, I'm not very used with the CCF, so perhaps clk_name is not needed at all. I
gave a try with the following combination:

 - con_id = NULL, dev_id = clk_name
 - con_id = clk_name, dev_id = NULL
 - con_id = NULL, dev_id = NULL

All worked.

And finally I removed the clk_hw_register_clkdev() call and it worked also.

So I'm not sure about this function.

Any idea ?

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

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