linux-kernel - Re: [PATCH 0/4][RFC] regmap: add force write option

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Date:	Thu, 2 Jul 2015 07:07:15 +0000
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	(Renesas) shiiba <naoya.shiiba.nx@...esas.com>
Subject: Re: [PATCH 0/4][RFC] regmap: add force write option


Hi Mark

Can I have some feedback about these patches ?

> Current _regmap_update_bits() writes data to register if current value and
> write value was different. This means it doesn't write data if the value was
> same as current value.
> But, some device needs to write data even though it was same value.
> 
> This RFC patch-set adds new "force_write" option on _regmap_update_bits()
> for this issue, but it focuses only 1 regmap write function at this point,
> because there are many regmap_xxx_write_yyy() functions.
> I can care all of regmap_xxx_write_yyy() functions in formal patch-set if
> this RFC patch idea was OK.
> 
> What do you think about this idea ?
> 
> Kuninori Morimoto (4):
>       regmap: add force_write option on _regmap_update_bits()
>       regmap: add regmap_write_bits()
>       regmap: add regmap_fields_force_write()
>       ASoC: rsnd: gen: add rsnd_force_write()
> 
>  drivers/base/regmap/regmap.c | 51 +++++++++++++++++++++++++++++++++++++++++++--------
>  include/linux/regmap.h       | 11 +++++++++++
>  sound/soc/sh/rcar/gen.c      | 16 ++++++++++++++++
>  sound/soc/sh/rcar/rsnd.h     |  4 ++++
>  4 files changed, 74 insertions(+), 8 deletions(-)
> 
> 
> Best regards
> ---
> Kuninori Morimoto
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