linux-kernel - Re: [PATCHv4 06/10] mfd: ti-lmu: add PWM support

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Date:   Mon, 9 Apr 2018 17:46:49 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Dan Murphy <dmurphy@...com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCHv4 06/10] mfd: ti-lmu: add PWM support

Hi,

On Wed, Apr 04, 2018 at 02:04:16PM -0500, Dan Murphy wrote:
> Sebastian
> 
> -Milo
> 
> On 03/30/2018 12:24 PM, Sebastian Reichel wrote:
> > This adds support to acquire the optional PWM channel,
> > that can be used by some of the LMU variants.
> > 
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
> > ---
> >  drivers/mfd/ti-lmu.c       | 11 +++++++++++
> >  include/linux/mfd/ti-lmu.h |  3 +++
> >  2 files changed, 14 insertions(+)
> > 
> > diff --git a/drivers/mfd/ti-lmu.c b/drivers/mfd/ti-lmu.c
> > index ce16c896879b..f43b8acc30e1 100644
> > --- a/drivers/mfd/ti-lmu.c
> > +++ b/drivers/mfd/ti-lmu.c
> > @@ -183,6 +183,17 @@ static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
> >  		return ret;
> >  	}
> >  
> > +	lmu->pwm = devm_pwm_get(dev, "lmu-backlight");
> 
> Patch 9 of this series, or a derivative of it, should technically
> be before Patch 6 so that the binding is correct.  Otherwise the
> binding will not match the code.

I guess the binding update should be the first patch. I will change
this in the next revision.

-- Sebastian

> > +	if (IS_ERR(lmu->pwm)) {
> > +		ret = PTR_ERR(lmu->pwm);
> > +		if (ret != -EINVAL) {
> > +			dev_err(dev, "Failed to get PWM: %d\n", ret);
> > +			return ret;
> > +		}
> > +
> > +		lmu->pwm = NULL;
> > +	}
> > +
> >  	ret = ti_lmu_enable_hw(lmu, id->driver_data);
> >  	if (ret)
> >  		return ret;
> > diff --git a/include/linux/mfd/ti-lmu.h b/include/linux/mfd/ti-lmu.h
> > index 1ef51ed36be5..246ab5145dff 100644
> > --- a/include/linux/mfd/ti-lmu.h
> > +++ b/include/linux/mfd/ti-lmu.h
> > @@ -17,6 +17,7 @@
> >  #include <linux/notifier.h>
> >  #include <linux/regmap.h>
> >  #include <linux/gpio/consumer.h>
> > +#include <linux/pwm.h>
> >  
> >  /* Notifier event */
> >  #define LMU_EVENT_MONITOR_DONE		0x01
> > @@ -77,12 +78,14 @@ enum lm363x_regulator_id {
> >   * @dev:	Parent device pointer
> >   * @regmap:	Used for i2c communcation on accessing registers
> >   * @en_gpio:	GPIO for HWEN pin [Optional]
> > + * @pwm:	PWM for module [Optional]
> >   * @notifier:	Notifier for reporting hwmon event
> >   */
> >  struct ti_lmu {
> >  	struct device *dev;
> >  	struct regmap *regmap;
> >  	struct gpio_desc *en_gpio;
> > +	struct pwm_device *pwm;
> >  	struct blocking_notifier_head notifier;
> >  };
> >  #endif
> > 
> 
> 
> -- 
> ------------------
> Dan Murphy

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