linux-kernel - Re: [PATCH] leds-lm3530: support pwm input mode and add platform data

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Message-ID: <CACRpkdZEKg1yAwYnJ+v9ZRM0hd2p5aOmVG4t3KbT7dc5MGNWxw@mail.gmail.com>
Date:	Thu, 19 Jan 2012 18:58:02 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Kim, Milo" <Milo.Kim@...com>
Cc:	"shreshthakumar.sahu@...ricsson.com" 
	<shreshthakumar.sahu@...ricsson.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"D.Murphy@...orola.com" <D.Murphy@...orola.com>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>
Subject: Re: [PATCH] leds-lm3530: support pwm input mode and add platform data

On Thu, Jan 19, 2012 at 5:36 AM, Kim, Milo <Milo.Kim@...com> wrote:

> (a) support pwm control mode
>  (1) add 'struct lm3530_pwm_data' in the platform data
>  The pwm data is the platform specific functions which generate the pwm.
>  The pwm data is only valid when brightness is pwm input mode.
>  Functions should be implemented by the pwm driver.
>  pwm_set_intensity() : set duty of pwm.
>  pwm_get_intensity() : get current duty of pwm.
>
>  (2) brightness control by pwm
>  If the control mode is pwm, then brightness is changed by the duty of pwm.
>  So pwm platform function should be called in lm3530_brightness_set().
>
>  (3) do not update brightness register when pwm input mode
>  In pwm input mode, brightness register is not used.
>  If any value is updated in this register, then the led will be off.
>
> (b) add 'name' in the lm3530_platform_data
>  : The led device name can be configurable.
>  For the compatibility, the name is set to default value(LM3530_LED_DEV)
>  when 'name' is not defined.
>
> (c) add 'is_vin_always_on' in the lm3530_platform_data
>  : The 'IN' pin(Input voltage connection) can be always turned on
>  in case it is connected with VBATT.
>  To support this case, 'is_vin_always_on' is added.
>  If VIN is always on, then we don't need to control the regulator for IN pin.
>
> (d) add 'lm3530_mode_get()' in the lm3530 device attribute
>  : To get information about brightness control mode.
>
> (e) use 'struct led_classdev' rather than 'struct i2c_client'
>  to get members of lm3530_data
>  : in lm3530_mode_set()
>
> (f) use 'pdata' rather than 'pltfm' in lm3530_init_registers()
>
> (g) for less arithmetic operation, replace 'divide-by-2' with
>  'shift-right-by 1 bit'
>  : in lm3530_brightness_set()

Very nice patch, but please split it into one patch per subject
(a) through (g) as per Documentation/SubmittingPatches,
this makes it easier to review and git bisect.

Yours,
Linus Walleij
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