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mfd: Add some documentation for WM8350 register lock 

Hopefully this will make the purpose of these functions a bit clearer,
it's not immediately obvious that the lock is a hardware feature.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
This commit is contained in:
Mark Brown 2008-11-08 00:57:33 +01:00 committed by Samuel Ortiz
parent 2c5212279a
commit 858e674466
1 changed files with 16 additions and 0 deletions
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16
drivers/mfd/wm8350-core.c
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@ -299,6 +299,13 @@ int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
}
EXPORT_SYMBOL_GPL(wm8350_block_write);
/**
* wm8350_reg_lock()
*
* The WM8350 has a hardware lock which can be used to prevent writes to
* some registers (generally those which can cause particularly serious
* problems if misused). This function enables that lock.
*/
int wm8350_reg_lock(struct wm8350 *wm8350)
{
u16 key = WM8350_LOCK_KEY;
@ -314,6 +321,15 @@ int wm8350_reg_lock(struct wm8350 *wm8350)
}
EXPORT_SYMBOL_GPL(wm8350_reg_lock);
/**
* wm8350_reg_unlock()
*
* The WM8350 has a hardware lock which can be used to prevent writes to
* some registers (generally those which can cause particularly serious
* problems if misused). This function disables that lock so updates
* can be performed. For maximum safety this should be done only when
* required.
*/
int wm8350_reg_unlock(struct wm8350 *wm8350)
{
u16 key = WM8350_UNLOCK_KEY;