[alsa-devel] [PATCH 1/3 v3] mfd: arizona: Export function to control subsystem DVFS

[Lee Jones]

On Mon, 23 Jun 2014, Charles Keepax wrote:

> From: Richard Fitzgerald <rf at opensource.wolfsonmicro.com>
> 
> Moving this control from being a side-effect of the LDO1
> regulator driver to a specific exported function.
> 
> Signed-off-by: Richard Fitzgerald <rf at opensource.wolfsonmicro.com>
> Signed-off-by: Charles Keepax <ckeepax at opensource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c       |   87 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/arizona/core.h |   12 +++++
>  2 files changed, 99 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index cfc191a..80f79ec 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -94,6 +94,92 @@ int arizona_clk32k_disable(struct arizona *arizona)
>  }
>  EXPORT_SYMBOL_GPL(arizona_clk32k_disable);
>  
> +int arizona_dvfs_up(struct arizona *arizona, unsigned int flags)
> +{
> +	unsigned int new_flags;
> +	int ret = 0;
> +
> +	mutex_lock(&arizona->subsys_max_lock);
> +
> +	new_flags = arizona->subsys_max_rq | flags;
> +
> +	if (arizona->subsys_max_rq != new_flags) {
> +		switch (arizona->type) {
> +		case WM5102:
> +		case WM8997:
> +			ret = regulator_set_voltage(arizona->dcvdd,
> +						    1800000, 1800000);
> +			if (ret != 0) {
> +				dev_err(arizona->dev,
> +					"Failed to raise dcvdd (%d)\n", ret);

Are you sure this message is accurate.  What if the voltage were
already v1.8?  Then you wouldn't technically be trying to raise it.

[...]

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