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

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Message-ID: <524089C8.4010108@wwwdotorg.org>
Date:	Mon, 23 Sep 2013 12:34:48 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
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-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 10/12] clk: tegra: move fixed clocks to common file

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.

But, isn't clk_m also a fixed clock then? I would expect one or two more
clocks in this file. What about clk_s, or is that known as clk_32k here?
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