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

Bryan Wu
2015-02-12T19:20:36Z

On Thu, Jan 29, 2015 at 11:07 AM, Bjorn Andersson
<bjorn.andersson@sonymobile.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@sonymobile.com>
>> >
>> > This adds support for the WLED ('White' LED) block on Qualcomm's
>> > PM8941 PMICs.
>> >
>> > Signed-off-by: Courtney Cavin cavin@sonymobile.com>
>> > Signed-off-by: Bjorn Andersson andersson@sonymobile.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