linux-kernel - Re: [PATCH 1/4] clk: samsung: out: Add infrastructure to register CLKOUT

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Date:	Mon, 12 May 2014 10:16:59 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	Pankaj Dubey <pankaj.dubey@...sung.com>
CC:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, mturquette@...aro.org,
	t.figa@...sung.com, kgene.kim@...sung.com, galak@...eaurora.org,
	ijc+devicetree@...lion.org.uk, mark.rutland@....com,
	pawel.moll@....com, robh+dt@...nel.org
Subject: Re: [PATCH 1/4] clk: samsung: out: Add infrastructure to register
 CLKOUT

On 05/10/2014 09:21 AM, Pankaj Dubey wrote:
> On 05/09/2014 10:00 PM, Tushar Behera wrote:
>> All SoC in Exynos-series have a clock with name XCLKOUT to provide
>> debug information about various clocks available in the SoC. The register
>> controlling the MUX and GATE of this clock is provided within PMU domain.
>> Since PMU domain can't be dedicatedly mapped by every driver, the
>> register
>> needs to be handled through a regmap handle provided by PMU syscon
>> controller. Right now, CCF doesn't allow regmap based MUX and GATE
>> clocks,
>> hence a dedicated clock provider for XCLKOUT is added here.
>>
>> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
>> CC: Tomasz Figa <t.figa@...sung.com>
>> ---
>>   drivers/clk/samsung/Makefile  |    2 +-
>>   drivers/clk/samsung/clk-out.c |  181
>> +++++++++++++++++++++++++++++++++++++++++
>>   drivers/clk/samsung/clk.h     |   33 ++++++++
>>   3 files changed, 215 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/clk/samsung/clk-out.c
>>

[ ... ]

>> +/**
>> + * struct samsung_clkout_soc_data: SoC specific register details
>> + * @reg: Offset of CLKOUT register from PMU base
> 
> how about naming this variable as "offset" instead of "reg".
> 

Okay, I will change that.

[ ... ]

>> +u8 samsung_clkout_get_parent(struct clk_hw *hw)
>> +{
>> +    struct samsung_clkout *clkout = to_clk_out(hw);
>> +    const struct samsung_clkout_soc_data *soc_data = clkout->soc_data;
>> +    unsigned int parent_mask = BIT(soc_data->mux_width) - 1;
>> +    unsigned int val;
>> +    int ret;
>> +
>> +    ret = regmap_read(clkout->regmap, soc_data->reg, &val);
> 
> Do we really need to keep return value in "ret" as I can't see you are
> using it anywhere?
> 

Right, we are not using that and can be removed.

>> +
>> +    return (val >> soc_data->mux_shift) & parent_mask;
>> +}
>> +

[ ... ]

>> +/* All existing Exynos serial of SoCs have common values for this
>> offsets. */
> typo: serial/series/

Sure. Thanks for your review.

-- 
Tushar Behera
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