linux-kernel - Re: [PATCH v4 02/14] regulator: Add function to map modes to struct regulator

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Date:	Tue, 04 Nov 2014 11:31:12 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Mark Brown <broonie@...nel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Olof Johansson <olof@...om.net>,
	Chris Zhong <zyw@...k-chips.com>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 02/14] regulator: Add function to map modes to struct
 regulator_desc

On pon, 2014-11-03 at 15:40 +0100, Javier Martinez Canillas wrote:
> The regulator-initial-mode and regulator-mode DT properties allows to
> configure the regulator operating modes at startup or when a system
> enters into a susend state.
> 
> But these properties use as valid values the operating modes supported
> by each device while the core deals with the standard operating modes.
> So a mapping function is needed to translate from the hardware specific
> modes to the standard ones.
> 
> This mapping is a non-varying configuration for each regulator, so add
> a function pointer to struct regulator_desc that will allow drivers to
> define their callback to do the modes translation.
> 
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> ---
>  include/linux/regulator/driver.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
> index 28da08e..b54d037 100644
> --- a/include/linux/regulator/driver.h
> +++ b/include/linux/regulator/driver.h
> @@ -243,6 +243,8 @@ enum regulator_type {
>   *
>   * @enable_time: Time taken for initial enable of regulator (in uS).
>   * @off_on_delay: guard time (in uS), before re-enabling a regulator
> + *
> + * @map_modes: Callback invoked to translate between hardware to standard modes.

Initially I thought it should map from standard to hardware. But then I
looked at max77802 implementation and it maps from hardware to standard.
Anyway I got confused (both are "modes" and both unsigned ints).

Could you describe which should be returned?


>   */
>  struct regulator_desc {
>  	const char *name;
> @@ -285,6 +287,8 @@ struct regulator_desc {
>  	unsigned int enable_time;
>  
>  	unsigned int off_on_delay;
> +
> +	unsigned int (*map_modes)(unsigned int mode);

Shouldn't this be in regulator ops?

Best regards,
Krzysztof



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