linux-kernel - Re: [PATCH 1/2] fb: backlight: HX8357: Make IM pins optionnal

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Date:	Tue, 25 Jun 2013 15:50:15 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-fbdev@...r.kernel.org, jimwall@...om, brian@...stalfontz.com,
	linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: Re: [PATCH 1/2] fb: backlight: HX8357: Make IM pins optionnal

Hi Jean Christophe,

On Mon, Jun 24, 2013 at 04:26:45PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 20:27 Fri 21 Jun     , Alexandre Belloni wrote:
> > From: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > 
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > ---
> >  drivers/video/backlight/hx8357.c | 53 +++++++++++++++++++++++-----------------
> >  1 file changed, 31 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/video/backlight/hx8357.c b/drivers/video/backlight/hx8357.c
> > index a0482b5..69f5672 100644
> > --- a/drivers/video/backlight/hx8357.c
> > +++ b/drivers/video/backlight/hx8357.c
> > @@ -76,6 +76,7 @@ struct hx8357_data {
> >  	unsigned		reset;
> >  	struct spi_device	*spi;
> >  	int			state;
> > +	u8			use_im_pins;
> boolean please

Ok.

> >  };
> >  
> >  static u8 hx8357_seq_power[] = {
> > @@ -250,9 +251,11 @@ static int hx8357_lcd_init(struct lcd_device *lcdev)
> >  	 * Set the interface selection pins to SPI mode, with three
> >  	 * wires
> >  	 */
> > -	gpio_set_value_cansleep(lcd->im_pins[0], 1);
> > -	gpio_set_value_cansleep(lcd->im_pins[1], 0);
> > -	gpio_set_value_cansleep(lcd->im_pins[2], 1);
> > +	if (lcd->use_im_pins) {
> > +		gpio_set_value_cansleep(lcd->im_pins[0], 1);
> > +		gpio_set_value_cansleep(lcd->im_pins[1], 0);
> > +		gpio_set_value_cansleep(lcd->im_pins[2], 1);
> > +	}
> 
> base on the dt probe you may have gpios betwee 0 to HX8357_NUM_IM_PINS
> 
> so this look wrong

How so?

HX8357_NUM_IM_PINS is defined to 3, the probe checks to see if we
actually have HX8357_NUM_IM_PINS, otherwise returns an error, what is
wrong in setting these pins here?

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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