linux-kernel - Re: [PATCH 10/12] clk: tegra: move fixed clocks to common file

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Date:	Tue, 24 Sep 2013 11:32:31 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Mike Turquette <mturquette@...aro.org>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Joseph Lo <josephl@...dia.com>,
	Paul Walmsley <pwalmsley@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 10/12] clk: tegra: move fixed clocks to common file

On Mon, Sep 23, 2013 at 08:34:48PM +0200, Stephen Warren wrote:
> On 09/18/2013 08:41 AM, Peter De Schrijver wrote:
> > Introduce a new file for fixed clocks common between several Tegra
> > SoCs and move Tegra114 to this new infrastructure.
> 
> > diff --git a/drivers/clk/tegra/clk-tegra-fixed.c b/drivers/clk/tegra/clk-tegra-fixed.c
> 
> > +void __init tegra_fixed_clk_init(struct tegra_clk *tegra_clks)
> 
> > +	/* clk_m_div2 */
> > +	dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m_div2, tegra_clks);
> > +	if (dt_clk) {
> > +		clk = clk_register_fixed_factor(NULL, "clk_m_div2", "clk_m",
> > +					CLK_SET_RATE_PARENT, 1, 2);
> > +		clk_register_clkdev(clk, "clk_m_div2", NULL);
> > +		*dt_clk = clk;
> > +	}
> 
> I guess "fixed" means "fixed at run-time", not "identical rate in all
> systems"? Since this is the crystal rate, it can vary between boards,
> but I supposed if "fixed" means "fixed at run-time", considering this as
> a fixed clock is fine.
> 

Fixed means "fixed at run-time" indeed. Although clk_32k is 32768Hz on all
boards as well.

> But, isn't clk_m also a fixed clock then? I would expect one or two more

I guess the code from clk-tegra-osc.c could be moved here if you think that's
better?

> clocks in this file. What about clk_s, or is that known as clk_32k here?

I don't think we ever had clk_s in upstream?

Cheers,

Peter.
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