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mfd: Disable more pulls on WM8994 

Disable more pulls by default on WM8994 for a small current saving. Since
some designs do leave SPKMODE floating provide platform data to allow that
to be left enabled.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2011-11-03 13:41:14 +00:00 committed by Samuel Ortiz
parent 73de16db43
commit 289aabdaf9
2 changed files with 14 additions and 3 deletions
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11
drivers/mfd/wm8994-core.c
View File

@ -374,6 +374,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
struct wm8994_pdata *pdata = wm8994->dev->platform_data;
const char *devname;
int ret, i;
int pulls = 0;
dev_set_drvdata(wm8994->dev, wm8994);
@ -516,12 +517,16 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
}
wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
if (pdata->spkmode_pu)
pulls |= WM8994_SPKMODE_PU;
}
/* Disable LDO pulldowns while the device is active */
/* Disable unneeded pulls */
wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
0);
WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
pulls);
/* In some system designs where the regulators are not in use,
* we can achieve a small reduction in leakage currents by

6
include/linux/mfd/wm8994/pdata.h
View File

@ -174,6 +174,12 @@ struct wm8994_pdata {
* consumption will rise.
*/
bool ldo_ena_always_driven;
/*
* SPKMODE must be pulled internally by the device on this
* system.
*/
bool spkmode_pu;
};
#endif