linux-kernel - Re: [PATCH 1/5] regulator: s5m8767: Add symbols for hard-coded DVS

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Message-ID: <20131217135153.GI19810@lee--X1>
Date:	Tue, 17 Dec 2013 13:51:53 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 1/5] regulator: s5m8767: Add symbols for hard-coded
 DVS_RAMP register

> Add symbols for hard-coded values of BUCK_RAMP field in DVS_RAMP
> register. This simplifies a little the code as register update is called
> only once.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/regulator/s5m8767.c         |   22 ++++++++++------------
>  include/linux/mfd/samsung/s5m8767.h |   15 +++++++++++++++
>  2 files changed, 25 insertions(+), 12 deletions(-)

<snip>

> diff --git a/include/linux/mfd/samsung/s5m8767.h b/include/linux/mfd/samsung/s5m8767.h
> index 9198377ee859..2ab0b0f03641 100644
> --- a/include/linux/mfd/samsung/s5m8767.h
> +++ b/include/linux/mfd/samsung/s5m8767.h
> @@ -186,4 +186,19 @@ enum s5m8767_regulators {
>  #define S5M8767_ENCTRL_SHIFT		6
>  #define S5M8767_ENCTRL_MASK		(0x3 << S5M8767_ENCTRL_SHIFT)
>  
> +/*
> + * Values for BUCK_RAMP field in DVS_RAMP register, matching raw values
> + * in mV/us.
> + */
> +enum s5m8767_dvs_buck_ramp_values {
> +	S5M8767_DVS_BUCK_RAMP_5		= 0x4,
> +	S5M8767_DVS_BUCK_RAMP_10	= 0x9,
> +	S5M8767_DVS_BUCK_RAMP_12_5	= 0xb,
> +	S5M8767_DVS_BUCK_RAMP_25	= 0xd,
> +	S5M8767_DVS_BUCK_RAMP_50	= 0xe,
> +	S5M8767_DVS_BUCK_RAMP_100	= 0xf,
> +};

Why do these have to be enums?

> +#define S5M8767_DVS_BUCK_RAMP_SHIFT	4
> +#define S5M8767_DVS_BUCK_RAMP_MASK	(0xf << S5M8767_DVS_BUCK_RAMP_SHIFT)
> +
>  #endif /* __LINUX_MFD_S5M8767_H */

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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