linux-kernel - Re: [PATCH v2 2/4] clk: exynos5410: register clocks using common clock framework

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Date:	Fri, 01 Nov 2013 17:58:34 +0100
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Vyacheslav Tyrtov <v.tyrtov@...sung.com>
Cc:	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>,
	Mike Turquette <mturquette@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Heiko Stuebner <heiko@...ech.de>,
	Naour Romain <romain.naour@...nwide.fr>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	Tarek Dakhran <t.dakhran@...sung.com>
Subject: Re: [PATCH v2 2/4] clk: exynos5410: register clocks using common clock framework

Hi,

On Monday 14 of October 2013 19:08:23 Vyacheslav Tyrtov wrote:
> From: Tarek Dakhran <t.dakhran@...sung.com>
> 
> The EXYNOS5410 clocks are statically listed and registered
> using the Samsung specific common clock helper functions.
> 
> Signed-off-by: Tarek Dakhran <t.dakhran@...sung.com>
> Signed-off-by: Vyacheslav Tyrtov <v.tyrtov@...sung.com>
> ---
>  .../devicetree/bindings/clock/exynos5410-clock.txt |  37 +++
>  drivers/clk/samsung/Makefile                       |   1 +
>  drivers/clk/samsung/clk-exynos5410.c               | 251
> +++++++++++++++++++++ include/dt-bindings/clock/exynos5410.h           
>  | 175 ++++++++++++++ 4 files changed, 464 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/clock/exynos5410-clock.txt create
> mode 100644 drivers/clk/samsung/clk-exynos5410.c
>  create mode 100644 include/dt-bindings/clock/exynos5410.h

The driver looks pretty good now, thanks for addressing my comments to 
previous version. There are still few issues remaining, though. Please see 
my comments inline.

[snip]
> diff --git a/drivers/clk/samsung/clk-exynos5410.c
> b/drivers/clk/samsung/clk-exynos5410.c new file mode 100644
> index 0000000..c5eba08
> --- /dev/null
> +++ b/drivers/clk/samsung/clk-exynos5410.c
[snip]
> +static struct of_device_id ext_clk_match[] __initdata = {
> +	{ .compatible = "samsung,clock-oscclk", .data = (void *)0, },
> +	{ },
> +};

I don't see anything in binding documentation mentioning this compatible 
value. Anyway, since there is already a generic binding for fixed rate 
clocks, this shouldn't be needed at all.

> +
> +/* register exynos5410 clocks */
> +static void __init exynos5410_clk_init(struct device_node *np)
> +{
> +	void __iomem *reg_base;
> +
> +	reg_base = of_iomap(np, 0);
> +	if (!reg_base)
> +		panic("%s: failed to map registers\n", __func__);
> +
> +	samsung_clk_init(np, reg_base, CLK_NR_CLKS,
> +			exynos5410_clk_regs, 
ARRAY_SIZE(exynos5410_clk_regs),
> +			NULL, 0);
> +	samsung_clk_of_register_fixed_ext(exynos5410_frt_ext_clks,
> +			ARRAY_SIZE(exynos5410_frt_ext_clks),
> +			ext_clk_match);

This call could be dropped after moving to generic fixed rate clock 
bindings.

Best regards,
Tomasz

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