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

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Date:	Thu, 29 Jan 2015 14:48:32 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	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>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...aro.org>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver


Hi Bjorn,

Just few nitpick comments. 

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>
> ---
>  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?

> 
> +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?

> +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?
 
> +               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?

Thank you,
Ivan
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