linux-kernel - Re: [PATCH 5/9] mfd: wm5110: Add register patch required for low power sleep

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Date:	Fri, 17 Apr 2015 09:09:37 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	lee.jones@...aro.org
Cc:	patches@...nsource.wolfsonmicro.com, broonie@...nel.org,
	sameo@...ux.intel.com, linux-kernel@...r.kernel.org,
	lgirdwood@...il.com
Subject: Re: [PATCH 5/9] mfd: wm5110: Add register patch required for low
	power sleep

On Wed, Apr 08, 2015 at 04:56:14PM +0100, Charles Keepax wrote:
> Some register settings must be applied before the first time low power
> sleep mode is entered on the wm5110 to ensure optimium performance.
> These settings require SYSCLK to be enabled whilst they are being
> applied. This patch applies the settings using the recently factored out
> boot time SYSCLK functionality.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mfd/arizona-core.c |   42 ++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 42 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index f1d9ef0..745ee6c 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -405,6 +405,38 @@ static int wm5102_clear_write_sequencer(struct arizona *arizona)
>  	return 0;
>  }
>  
> +/*
> + * Register patch to some of the CODECs internal write sequences
> + * to ensure a clean exit from the low power sleep state.
> + */
> +static const struct reg_default wm5110_sleep_patch[] = {
> +	{ 0x337A, 0xC100 },
> +	{ 0x337B, 0x0041 },
> +	{ 0x3300, 0xA210 },
> +	{ 0x3301, 0x050C },
> +};
> +
> +static int wm5110_apply_sleep_patch(struct arizona *arizona)
> +{
> +	struct arizona_sysclk_state state;
> +	int err, ret;
> +
> +	ret = arizona_enable_freerun_sysclk(arizona, &state);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_multi_reg_write_bypassed(arizona->regmap,
> +					      wm5110_sleep_patch,
> +					      ARRAY_SIZE(wm5110_sleep_patch));
> +
> +	err = arizona_disable_freerun_sysclk(arizona, &state);
> +
> +	if (ret)
> +		return ret;
> +	else
> +		return err;

Sorry this should also be a ternary, will do a new spin.

Thanks,
Charles
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