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: Milo Kim <milo.kim@ti.com>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/backlight/lp855x-driver.txt b/Documentation/backlight/lp855x-driver.txt
index 1c732f0..01bce24 100644 (file)
--- a/Documentation/backlight/lp855x-driver.txt
+++ b/Documentation/backlight/lp855x-driver.txt
@@ -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
 ------------------------

diff --git a/Documentation/devicetree/bindings/video/backlight/lp855x.txt b/Documentation/devicetree/bindings/video/backlight/lp855x.txt
index 1482103..96e83a5 100644 (file)
--- a/Documentation/devicetree/bindings/video/backlight/lp855x.txt
+++ b/Documentation/devicetree/bindings/video/backlight/lp855x.txt
@@ -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";

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index d4a7a35..a65dd06 100644 (file)
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -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"

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index c0b41f1..c952175 100644 (file)
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -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},
        { }

diff --git a/include/linux/platform_data/lp855x.h b/include/linux/platform_data/lp855x.h
index ea32005..1b2ba24 100644 (file)
--- a/include/linux/platform_data/lp855x.h
+++ b/include/linux/platform_data/lp855x.h
@@ -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 */