linux-kernel - Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver

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Date:	Thu, 12 Feb 2015 11:20:13 -0800
From:	Bryan Wu <cooloney@...il.com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...aro.org>,
	"Cavin, Courtney" <Courtney.Cavin@...ymobile.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver

On Thu, Jan 29, 2015 at 11:07 AM, Bjorn Andersson
<bjorn.andersson@...ymobile.com> wrote:
> On Thu 29 Jan 04:48 PST 2015, Ivan T. Ivanov wrote:
>
>>
>> Hi Bjorn,
>>
>> Just few nitpick comments.
>>
>
> Thanks.
>
>> On Fri, 2015-01-23 at 16:54 -0800, Bjorn Andersson wrote:
>> > From: Courtney Cavin cavin@...ymobile.com>
>> >
>> > This adds support for the WLED ('White' LED) block on Qualcomm's
>> > PM8941 PMICs.
>> >
>> > Signed-off-by: Courtney Cavin cavin@...ymobile.com>
>> > Signed-off-by: Bjorn Andersson andersson@...ymobile.com>


I'm good with this patch and will merge it into my tree.

Thanks,
-Bryan

>> > ---
>> >  drivers/leds/Kconfig            |   8 +
>> >  drivers/leds/Makefile           |   1 +
>> >  drivers/leds/leds-pm8941-wled.c | 459 ++++++++++++++++++++++++++++++++++++++++
>> >  3 files changed, 468 insertions(+)
>> >  create mode 100644 drivers/leds/leds-pm8941-wled.c
>> >
>>
>> <snip>
>>
>> > +
>> > +#define PM8941_WLED_REG_VAL_BASE               0x40
>> > +#define  PM8941_WLED_REG_VAL_MAX               0xFFF
>> > +
>> > +#define PM8941_WLED_REG_MOD_EN                 0x46
>> > +#define  PM8941_WLED_REG_MOD_EN_BIT            BIT(7)
>> > +#define  PM8941_WLED_REG_MOD_EN_MASK           BIT(7)
>>
>> Is it possible bit definitions to have same indentation like registers offsets?
>>
>
> Well, yes ;)
>
> But I like the separation, so unless Bryan would like me to change it I prefer
> to leave it as is.
>
>> >
>> > +struct pm8941_wled_config {
>> > +       u32 i_boost_limit;
>> > +       u32 ovp;
>> > +       u32 switch_freq;
>> > +       u32 num_strings;
>> > +       u32 i_limit;
>> > +       bool cs_out_en;
>> > +       bool ext_gen;
>> > +       bool cabc_en;
>> > +};
>> > +
>>
>> Could this be further squashed to bellow structure?
>>
>
> It could, but I see that it would simplify things.
>
>> > +struct pm8941_wled {
>> > +       struct regmap *regmap;
>> > +       u16 addr;
>> > +
>> > +       struct led_classdev cdev;
>> > +
>> > +       struct pm8941_wled_config cfg;
>> > +};
>> > +
>> >
>>
>> <snip>
>>
>> > +static void pm8941_wled_set_brightness(struct led_classdev *cdev,
>> > +                                                                                       enum
>> > led_brightness value)
>> > +{
>> > +       if (pm8941_wled_set(cdev, value)) {
>>
>> pm8941_wled_set() is used only here, could it be merged into this function?
>>
>
> It could, but that would just mean that we move these lines into the tail of
> pm8941_wled_set and replace all the returns with a bunch of gotos. So I don't
> think it's cleaner.
>
>> > +               dev_err(cdev->dev, "Unable to set brightness\n");
>> > +               return;
>> > +       }
>> > +       cdev->brightness = value;
>> > +}
>> > +
>> >
>>
>> Otherwise it looks good. Driver is loaded and device is detected
>> properly (i have added readings for type and subtype registers).
>> Do you know where I can measure result from changing brightness
>> sysfs entry. I am using 8074 dragonboard?
>>
>
> I'm not sure how this is exposed on the dragonboard. I've tested it on Xperia
> Z1 (honami) and the display lights up nicely.
>
> Regards,
> Bjorn
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