linux-kernel - Re: [PATCH V1] mfd: da9062: fix missing volatile registers in the core regmap

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Date:	Wed, 10 Feb 2016 16:56:03 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Steve Twiss <stwiss.opensource@...semi.com>
Cc:	LINUXKERNEL <linux-kernel@...r.kernel.org>,
	David Dajun Chen <david.chen@...semi.com>,
	Support Opensource <support.opensource@...semi.com>
Subject: Re: [PATCH V1] mfd: da9062: fix missing volatile registers in the
 core regmap_range volatile lists

On Mon, 01 Feb 2016, Steve Twiss wrote:

> From: Steve Twiss <stwiss.opensource@...semi.com>
> 
> Add an updated set of registers listed in the core regmap_range volatile
> ranges defined for the DA9062.
> 
> These new registers contain bits that cannot be considered under the full
> control of software. Under various conditions the hardware will set and/or
> automatically clear bit(s) contained in these registers.
> 
> When using a cached version of regmap, the volatility of these registers must
> be identified otherwise the regmap operations may not ensure the registers
> are explicitly altered.
> 
> As well as updating the list of volatile registers, this change will fix a
> corner case discovered in the DA9063 ONKEY which is used by the DA9062 core.
>  
> In the ONKEY case, the CONTROL_B register is now listed as volatile in the
> regmap_range because it contains the bit field NONKEY_LOCK. This bit can be
> altered by hardware, in which case regmap must be notified of its ability
> to be manpiulated outside of software control.
> 
> Signed-off-by: Steve Twiss <stwiss.opensource@...semi.com>

Applied, thanks.

> ---
> Checks performed with linux-next/v4.5-rc1/scripts/checkpatch.pl
>  da9062-core.c             total: 0 errors, 0 warnings, 554 lines checked
> This patch applies against linux-next and v4.5-rc1
> 
> Regards,
> Steve
> 
> 
>  drivers/mfd/da9062-core.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/da9062-core.c b/drivers/mfd/da9062-core.c
> index a9ad024..8f873866 100644
> --- a/drivers/mfd/da9062-core.c
> +++ b/drivers/mfd/da9062-core.c
> @@ -388,11 +388,32 @@ static const struct regmap_range da9062_aa_volatile_ranges[] = {
>  		.range_min = DA9062AA_STATUS_D,
>  		.range_max = DA9062AA_EVENT_C,
>  	}, {
> -		.range_min = DA9062AA_CONTROL_F,
> +		.range_min = DA9062AA_CONTROL_A,
> +		.range_max = DA9062AA_CONTROL_B,
> +	}, {
> +		.range_min = DA9062AA_CONTROL_E,
>  		.range_max = DA9062AA_CONTROL_F,
>  	}, {
> +		.range_min = DA9062AA_BUCK2_CONT,
> +		.range_max = DA9062AA_BUCK4_CONT,
> +	}, {
> +		.range_min = DA9062AA_BUCK3_CONT,
> +		.range_max = DA9062AA_BUCK3_CONT,
> +	}, {
> +		.range_min = DA9062AA_LDO1_CONT,
> +		.range_max = DA9062AA_LDO4_CONT,
> +	}, {
> +		.range_min = DA9062AA_DVC_1,
> +		.range_max = DA9062AA_DVC_1,
> +	}, {
>  		.range_min = DA9062AA_COUNT_S,
>  		.range_max = DA9062AA_SECOND_D,
> +	}, {
> +		.range_min = DA9062AA_SEQ,
> +		.range_max = DA9062AA_SEQ,
> +	}, {
> +		.range_min = DA9062AA_EN_32K,
> +		.range_max = DA9062AA_EN_32K,
>  	},
>  };
>  

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