linux-kernel - Re: [PATCH] backlight: Add TI LMU backlight driver

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Date:   Mon, 20 Mar 2017 07:54:53 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Milo Kim <milo.kim@...com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] backlight: Add TI LMU backlight driver

Hi,

On Mon, Mar 20, 2017 at 11:21:04AM +0900, Milo Kim wrote:
> This is consolidated driver which supports backlight devices below.
>   LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697.
> 
> Structure
> ---------
>   It consists of two parts - core and data.
> 
>   Core part supports features below.
>     - Backlight subsystem control
>     - Channel configuration from DT properties
>     - Light dimming effect control: ramp up and down.
>     - LMU fault monitor notifier handling
>     - PWM brightness control
> 
>   Data part describes device specific data.
>     - Register value configuration for each LMU device
>       : initialization, channel configuration, control mode, enable and
>         brightness.
>     - PWM action configuration
>     - Light dimming effect table
>     - Option for LMU fault monitor support
> 
> Macros for register data
> ------------------------
>   All LMU devices have 8-bit based registers. LMU_BL_REG() creates 24-bit
>   register value in data part. It consists of address, mask and value.
>   On the other hand, register value should be parsed when the driver
>   reads/writes data from/to I2C registers. Driver uses LMU_BL_GET_ADDR(),
>   LMU_BL_GET_MASK() and LMU_BL_GET_VAL() for this purpose.
> 
> Data structure
> --------------
>   ti_lmu_bl:         Backlight output channel data
>   ti_lmu_bl_chip:    Backlight device data. One device can have multiple
>                      backlight channel data.
>   ti_lmu_bl_reg:     Backlight device register data
>   ti_lmu_bl_cfg:     Backlight configuration data for each LMU device
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Sebastian Reichel <sre@...nel.org>
> Cc: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Milo Kim <milo.kim@...com>

Works on Droid 4:

Tested-by: Sebastian Reichel <sre@...nel.org>

-- Sebastian

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