linux-kernel - Re: [PATCH RFC 4/5] clk: samsung: Add clock driver for s5pc110/s5pv210

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Date:	Mon, 26 Aug 2013 19:12:35 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
Cc:	kgene.kim@...sung.com, kyungmin.park@...sung.com,
	t.figa@...sung.com, tomasz.figa@...il.com, rob.herring@...xeda.com,
	pawel.moll@....com, mark.rutland@....com, swarren@...dotorg.org,
	ian.campbell@...rix.com, rob@...dley.net, mturquette@...aro.org,
	thomas.abraham@...aro.org, t.stanislaws@...sung.com,
	m.chehab@...sung.com, s.nawrocki@...sung.com,
	m.szyprowski@...ung.com, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH RFC 4/5] clk: samsung: Add clock driver for s5pc110/s5pv210

On Monday, August 26, 2013 01:38:33 PM Mateusz Krawczuk wrote:
> This patch adds new, Common Clock Framework-based clock driver for Samsung
> S5PV210 SoCs. The driver is just added, without enabling it yet.
> 
> Signed-off-by: Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
> ---
>  .../bindings/clock/samsung,s5pv210-clock.txt       |  72 ++
>  drivers/clk/samsung/Makefile                       |   3 +-
>  drivers/clk/samsung/clk-s5pv210.c                  | 732 +++++++++++++++++++++
>  include/dt-bindings/clock/samsung,s5pv210-clock.h  | 221 +++++++
>  4 files changed, 1027 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/clock/samsung,s5pv210-clock.txt
>  create mode 100644 drivers/clk/samsung/clk-s5pv210.c
>  create mode 100644 include/dt-bindings/clock/samsung,s5pv210-clock.h

[...]

> diff --git a/drivers/clk/samsung/clk-s5pv210.c b/drivers/clk/samsung/clk-s5pv210.c
> new file mode 100644
> index 0000000..861d37d
> --- /dev/null
> +++ b/drivers/clk/samsung/clk-s5pv210.c

[...]

> +static unsigned long s5pv210_get_xom(void)

This function can be marked with __init.

> +{
> +	unsigned long xom = 1;
> +	void __iomem *chipid_base;
> +	struct device_node *np;
> +
> +	np = of_find_compatible_node(NULL, NULL, "samsung,s5pv210-chipid");
> +	if (np) {
> +		chipid_base = of_iomap(np, 0);

How's about printing an error if !chipid_base?

Also the code can be made a bit shorter:

if (np) {
	void __iomem *chipid_base = of_iomap(np, 0);
...
}

> +		if (chipid_base)
> +			xom = readl(chipid_base + 8);
> +
> +		iounmap(chipid_base);

It seems that at least generic iounmap() accepts NULL argument but it 
will be better not to call it if of_iomap() failed.

> +	}
> +
> +	return xom;
> +}

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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