linux-kernel - Re: [PATCH v2 2/4] mfd: wm5110: Add register patch required for low power sleep

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Message-ID: <20150323141307.GI24804@x1>
Date:	Mon, 23 Mar 2015 14:13:07 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	broonie@...nel.org, sameo@...ux.intel.com, lgirdwood@...il.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] mfd: wm5110: Add register patch required for low
 power sleep

On Tue, 17 Mar 2015, 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>
> ---
>  drivers/mfd/arizona-core.c |   29 +++++++++++++++++++++++++++++
>  1 files changed, 29 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index ef1f8aa..8f61ccf 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -344,6 +344,25 @@ static inline int arizona_apply_hardware_patch(struct arizona *arizona)
>  	return arizona_exec_with_sysclk(arizona, arizona_hardware_patch_wseq);
>  }
>  
> +static const struct reg_default wm5110_sleep_patch[] = {
> +	{ 0x337A, 0xC100 },
> +	{ 0x337B, 0x0041 },
> +	{ 0x3300, 0xA210 },
> +	{ 0x3301, 0x050C },
> +};

Really not keen on all these magic numbers.

Would you be kind enough to define them please?

> +static inline int wm5110_sleep_patch_wseq(struct arizona *arizona)

What is 'wseq'?

I suggest if I'm having to ask that it's not a very good name.

> +{
> +	return regmap_multi_reg_write_bypassed(arizona->regmap,
> +					       wm5110_sleep_patch,
> +					       ARRAY_SIZE(wm5110_sleep_patch));
> +}
> +
> +static inline int wm5110_apply_sleep_patch(struct arizona *arizona)
> +{
> +	return arizona_exec_with_sysclk(arizona, wm5110_sleep_patch_wseq);
> +}
> +
>  #ifdef CONFIG_PM
>  static int arizona_runtime_resume(struct device *dev)
>  {
> @@ -913,6 +932,16 @@ int arizona_dev_init(struct arizona *arizona)
>  				goto err_reset;
>  			}
>  			break;
> +		case WM5110:
> +		case WM8280:
> +			ret = wm5110_apply_sleep_patch(arizona);
> +			if (ret != 0) {

if (ret) {

> +				dev_err(arizona->dev,
> +					"Failed to apply sleep patch: %d\n",
> +					ret);
> +				goto err_reset;
> +			}
> +			break;
>  		default:
>  			break;
>  		}

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