linux-kernel - Re: [PATCH v2 4/4] mfd: wm5110: Set DCVDD voltage to 1.175V before entering sleep mode

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Message-ID: <20150323141529.GJ24804@x1>
Date:	Mon, 23 Mar 2015 14:15:29 +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 4/4] mfd: wm5110: Set DCVDD voltage to 1.175V before
 entering sleep mode

On Tue, 17 Mar 2015, Charles Keepax wrote:

> The low power sleep mode on wm5110 requires that the LDO1 regulator be
> set to 1.175V prior to entering sleep, then returned to 1.2V after
> exiting sleep mode. This patch apply these regulator settings.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c |   52 ++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 52 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index 8f61ccf..d208c20 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -407,6 +407,37 @@ static int arizona_runtime_resume(struct device *dev)
>  			goto err;
>  		}
>  		break;
> +	case WM5110:
> +	case WM8280:
> +		ret = arizona_wait_for_boot(arizona);
> +		if (ret != 0)

Nit: if (ret)

> +			goto err;
> +
> +		if (arizona->external_dcvdd) {
> +			ret = regmap_update_bits(arizona->regmap,
> +						 ARIZONA_ISOLATION_CONTROL,
> +						 ARIZONA_ISOLATE_DCVDD1, 0);
> +			if (ret != 0) {

Nit: And so on ...

> +				dev_err(arizona->dev,
> +					"Failed to connect DCVDD: %d\n", ret);
> +				goto err;
> +			}
> +		} else {
> +			/*
> +			 * As this is only called for the internal regulator
> +			 * (where we know voltage ranges available) it is ok
> +			 * to request an exact range.
> +			 */
> +			ret = regulator_set_voltage(arizona->dcvdd,
> +						    1200000, 1200000);
> +			if (ret < 0) {
> +				dev_err(arizona->dev,
> +					"Failed to set resume voltage: %d\n",
> +					ret);
> +				goto err;
> +			}
> +		}
> +		break;
>  	default:
>  		ret = arizona_wait_for_boot(arizona);
>  		if (ret != 0) {
> @@ -457,6 +488,27 @@ static int arizona_runtime_suspend(struct device *dev)
>  				ret);
>  			return ret;
>  		}
> +	} else {
> +		switch (arizona->type) {
> +		case WM5110:
> +		case WM8280:
> +			/*
> +			 * As this is only called for the internal regulator
> +			 * (where we know voltage ranges available) it is ok
> +			 * to request an exact range.
> +			 */
> +			ret = regulator_set_voltage(arizona->dcvdd,
> +						    1175000, 1175000);
> +			if (ret < 0) {
> +				dev_err(arizona->dev,
> +					"Failed to set suspend voltage: %d\n",
> +					ret);
> +				return ret;
> +			}
> +			break;
> +		default:
> +			break;
> +		}
>  	}
>  
>  	regcache_cache_only(arizona->regmap, true);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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