linux-kernel - Re: [PATCH v2 11/14] regulator: s2mps11: Add opmode for S2MPS14 regulators

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Date:	Thu, 13 Feb 2014 12:43:20 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Sangbeom Kim <sbkim73@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH v2 11/14] regulator: s2mps11: Add opmode for S2MPS14
 regulators

> S2MPS11/S2MPS14 regulators support different modes of operation:
>  - Always off;
>  - On/Off controlled by pin/GPIO (PWREN/LDOEN/EMMCEN);
>  - Always on;
> This is very similar to S5M8767 regulator driver which also supports
> opmodes (although S5M8767 have also low-power mode).
> 
> This patch adds parsing the operation mode from DTS by reading a
> "op_mode" property from regulator child node.
> 
> The op_mode is then used for enabling the S2MPS14 regulators.
> On S2MPS11 the DTS "op_mode" property is parsed but not used for
> enabling, as this was not tested.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Liam Girdwood <lgirdwood@...il.com>
> ---
>  drivers/regulator/s2mps11.c         |   97 ++++++++++++++++++++++++++++++++++-
>  include/linux/mfd/samsung/s2mps14.h |   19 +++++++
>  2 files changed, 115 insertions(+), 1 deletion(-)

<snip>

> +++ b/include/linux/mfd/samsung/s2mps14.h
> @@ -149,4 +149,23 @@ enum s2mps14_regulators {
>  #define S2MPS14_LDO_N_VOLTAGES		(S2MPS14_LDO_VSEL_MASK + 1)
>  #define S2MPS14_BUCK_N_VOLTAGES		(S2MPS14_BUCK_VSEL_MASK + 1)
>  
> +#define S2MPS14_ENCTRL_SHIFT		6
> +#define S2MPS14_ENCTRL_MASK		(0x3 << S2MPS14_ENCTRL_SHIFT)
> +
> +/*
> + * Values of regulator operation modes match device tree bindings.
> + */
> +enum s2mps14_regulator_opmode {
> +	S2MPS14_REGULATOR_OPMODE_OFF		= 0,
> +	S2MPS14_REGULATOR_OPMODE_ON		= 1,
> +	/*
> +	 * Reserved for compatibility with S5M8767 where this
> +	 * is a low power mode.
> +	 */
> +	S2MPS14_REGULATOR_OPMODE_RESERVED	= 2,
> +	S2MPS14_REGULATOR_OPMODE_SUSPEND	= 3,

You don't need to number these like this. If you want to force the
numbering to start at '0' initialise the top value, then the rest
should be sequential.

> +	S2MPS14_REGULATOR_OPMODE_MAX,
> +};
> +
>  #endif /*  __LINUX_MFD_S2MPS14_H */

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