linux-kernel - Re: [PATCH] clk: at91: add sama5d3 pmc driver

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Message-ID: <20200109214128.GB1027187@piout.net>
Date:   Thu, 9 Jan 2020 22:41:28 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: at91: add sama5d3 pmc driver

On 09/01/2020 10:19:09-0800, Stephen Boyd wrote:
> Quoting Alexandre Belloni (2020-01-08 03:02:18)
> > On 05/01/2020 19:09:04-0800, Stephen Boyd wrote:
> > > > +       return;
> > > > +
> > > > +err_free:
> > > > +       pmc_data_free(sama5d3_pmc);
> > > > +}
> > > > +CLK_OF_DECLARE_DRIVER(sama5d3_pmc, "atmel,sama5d3-pmc", sama5d3_pmc_setup);
> > > 
> > > Any reason this can't be a platform driver?
> > > 
> > 
> > As for the other PMC driver, we need a few of the peripheral clocks very
> > early which means that we would have to register most of the clock tree
> > registered early leaving only a few clocks to be registered by a
> > platform driver.
> > 
> 
> What peripheral clks? Can you add a comment to the code?
> 

The TCB is used as the clocksource so its clock is needed. Its parent is
the master clock which has UTMI, PLLA, the mainclock and the slow clock
as parents so by that point, most of the tree is registered.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com