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Commit 5812c13a authored by Milo Kim's avatar Milo Kim Committed by Linus Torvalds
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backlight: lp855x_bl: support new LP8555 device 



LP8555 is one of the LP855x family devices.

This device needs pre_init_device() and post_init_device() driver
structure.  It's same as LP8557, so the device configuration code is
shared with LP8557.  Backlight outputs are generated from dual DC-DC boost
converters.  It's configurable EPROM settings which are defined in the
platform data.

Driver documentation and device tree bindings are updated.

Signed-off-by: default avatarMilo Kim <milo.kim@ti.com>
Signed-off-by: default avatarJingoo Han <jg1.han@samsung.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b300645a

Documentation/backlight/lp855x-driver.txt

+3 −2
Original line number Diff line number Diff line
@@ -4,7 +4,8 @@ Kernel driver lp855x 
Backlight driver for LP855x ICs



Supported chips:

	Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8556 and LP8557

	Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and

	LP8557



Author: Milo(Woogyom) Kim <milo.kim@ti.com>
@@ -24,7 +25,7 @@ Value : pwm based or register based 


2) chip_id

The lp855x chip id.

Value : lp8550/lp8551/lp8552/lp8553/lp8556/lp8557

Value : lp8550/lp8551/lp8552/lp8553/lp8555/lp8556/lp8557



Platform data for lp855x

------------------------

Documentation/devicetree/bindings/video/backlight/lp855x.txt

+28 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ lp855x bindings 


Required properties:

  - compatible: "ti,lp8550", "ti,lp8551", "ti,lp8552", "ti,lp8553",

                "ti,lp8556", "ti,lp8557"

                "ti,lp8555", "ti,lp8556", "ti,lp8557"

  - reg: I2C slave address (u8)

  - dev-ctrl: Value of DEVICE CONTROL register (u8). It depends on the device.
@@ -15,6 +15,33 @@ Optional properties: 


Example:



	/* LP8555 */

	backlight@2c {

		compatible = "ti,lp8555";

		reg = <0x2c>;



		dev-ctrl = /bits/ 8 <0x00>;

		pwm-period = <10000>;



		/* 4V OV, 4 output LED0 string enabled */

		rom_14h {

			rom-addr = /bits/ 8 <0x14>;

			rom-val = /bits/ 8 <0xcf>;

		};



		/* Heavy smoothing, 24ms ramp time step */

		rom_15h {

			rom-addr = /bits/ 8 <0x15>;

			rom-val = /bits/ 8 <0xc7>;

		};



		/* 4 output LED1 string enabled */

		rom_19h {

			rom-addr = /bits/ 8 <0x19>;

			rom-val = /bits/ 8 <0x0f>;

		};

	};



	/* LP8556 */

	backlight@2c {

		compatible = "ti,lp8556";

drivers/video/backlight/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -388,8 +388,8 @@ config BACKLIGHT_LP855X 
	tristate "Backlight driver for TI LP855X"

	depends on BACKLIGHT_CLASS_DEVICE && I2C

	help

	  This supports TI LP8550, LP8551, LP8552, LP8553, LP8556 and LP8557

	  backlight driver.

	  This supports TI LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and

	  LP8557 backlight driver.



config BACKLIGHT_LP8788

	tristate "Backlight driver for TI LP8788 MFD"

drivers/video/backlight/lp855x_bl.c

+15 −2
Original line number Diff line number Diff line
@@ -26,13 +26,15 @@ 
#define LP8556_EPROM_START		0xA0

#define LP8556_EPROM_END		0xAF



/* LP8557 Registers */

/* LP8555/7 Registers */

#define LP8557_BL_CMD			0x00

#define LP8557_BL_MASK			0x01

#define LP8557_BL_ON			0x01

#define LP8557_BL_OFF			0x00

#define LP8557_BRIGHTNESS_CTRL		0x04

#define LP8557_CONFIG			0x10

#define LP8555_EPROM_START		0x10

#define LP8555_EPROM_END		0x7A

#define LP8557_EPROM_START		0x10

#define LP8557_EPROM_END		0x1E
@@ -111,6 +113,10 @@ static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr) 
		start = LP8556_EPROM_START;

		end = LP8556_EPROM_END;

		break;

	case LP8555:

		start = LP8555_EPROM_START;

		end = LP8555_EPROM_END;

		break;

	case LP8557:

		start = LP8557_EPROM_START;

		end = LP8557_EPROM_END;
@@ -165,9 +171,14 @@ static int lp855x_configure(struct lp855x *lp) 
	struct lp855x_platform_data *pd = lp->pdata;



	switch (lp->chip_id) {

	case LP8550 ... LP8556:

	case LP8550:

	case LP8551:

	case LP8552:

	case LP8553:

	case LP8556:

		lp->cfg = &lp855x_dev_cfg;

		break;

	case LP8555:

	case LP8557:

		lp->cfg = &lp8557_dev_cfg;

		break;
@@ -470,6 +481,7 @@ static const struct of_device_id lp855x_dt_ids[] = { 
	{ .compatible = "ti,lp8551", },

	{ .compatible = "ti,lp8552", },

	{ .compatible = "ti,lp8553", },

	{ .compatible = "ti,lp8555", },

	{ .compatible = "ti,lp8556", },

	{ .compatible = "ti,lp8557", },

	{ }
@@ -481,6 +493,7 @@ static const struct i2c_device_id lp855x_ids[] = { 
	{"lp8551", LP8551},

	{"lp8552", LP8552},

	{"lp8553", LP8553},

	{"lp8555", LP8555},

	{"lp8556", LP8556},

	{"lp8557", LP8557},

	{ }

include/linux/platform_data/lp855x.h

+19 −0
Original line number Diff line number Diff line
@@ -40,6 +40,17 @@ 
#define LP8553_PWM_CONFIG	LP8550_PWM_CONFIG

#define LP8553_I2C_CONFIG	LP8550_I2C_CONFIG



/* CONFIG register - LP8555 */

#define LP8555_PWM_STANDBY	BIT(7)

#define LP8555_PWM_FILTER	BIT(6)

#define LP8555_RELOAD_EPROM	BIT(3)	/* use it if EPROMs should be reset

					   when the backlight turns on */

#define LP8555_OFF_OPENLEDS	BIT(2)

#define LP8555_PWM_CONFIG	LP8555_PWM_ONLY

#define LP8555_I2C_CONFIG	LP8555_I2C_ONLY

#define LP8555_COMB1_CONFIG	LP8555_COMBINED1

#define LP8555_COMB2_CONFIG	LP8555_COMBINED2



/* DEVICE CONTROL register - LP8556 */

#define LP8556_PWM_CONFIG	(LP8556_PWM_ONLY << BRT_MODE_SHFT)

#define LP8556_COMB1_CONFIG	(LP8556_COMBINED1 << BRT_MODE_SHFT)
@@ -65,6 +76,7 @@ enum lp855x_chip_id { 
	LP8551,

	LP8552,

	LP8553,

	LP8555,

	LP8556,

	LP8557,

};
@@ -89,6 +101,13 @@ enum lp8553_brighntess_source { 
	LP8553_I2C_ONLY = LP8550_I2C_ONLY,

};



enum lp8555_brightness_source {

	LP8555_PWM_ONLY,

	LP8555_I2C_ONLY,

	LP8555_COMBINED1,	/* Brightness register with shaped PWM */

	LP8555_COMBINED2,	/* PWM with shaped brightness register */

};



enum lp8556_brightness_source {

	LP8556_PWM_ONLY,

	LP8556_COMBINED1,	/* pwm + i2c before the shaper block */