RE: [PATCH RFT] regulator: lp8788-ldo: Use ldo->en_pin to check ifregulator is enabled by external pin

From: Kim, Milo
Date: Mon Jan 07 2013 - 18:23:28 EST

> -----Original Message-----
> From: Mark Brown [mailto:broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx]
> Sent: Monday, January 07, 2013 8:08 PM
> To: Axel Lin
> Cc: Kim, Milo; Girdwood, Liam; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH RFT] regulator: lp8788-ldo: Use ldo->en_pin to
> check if regulator is enabled by external pin
> On Sat, Jan 05, 2013 at 03:33:43PM +0800, Axel Lin wrote:
> > ldo->en_pin is set iff the regulator is enabled by external pin.
> >
> > This patch sets ldo->en_pin to NULL if lp8788_gpio_request_ldo_en()
> fails, then
> > we can use it to determinate if the regulator is controlled by
> external pin or
> > register.
> Applied, thanks. However we should be converting the driver to use the
> core support for this - the GPIO can just be given to the core in the
> regulator config which should handle everything transparently.

Thanks, Mark!

I have a question.
Do you mean the dependency of CONFIG_GENERIC_GPIO in this driver?

If yes, lp8788-ldo driver still works.
If the gpio_request_one() gets failed on loading the driver, then the lp8788-ldo
driver refers to register based by default.
So LDOs can be enabled/disabled by the I2C, not external GPIO pins.
In that case, GPIO functions are not invoked any more.


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