Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) ====================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) Kernel driver lp855x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) ====================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) Backlight driver for LP855x ICs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) Supported chips:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	LP8557
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) Author: Milo(Woogyom) Kim <milo.kim@ti.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) Description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) -----------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Brightness control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)   Brightness can be controlled by the pwm input or the i2c command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)   The lp855x driver supports both cases.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Device attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)   1) bl_ctl_mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)   Backlight control mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)   Value: pwm based or register based
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)   2) chip_id
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)   The lp855x chip id.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)   Value: lp8550/lp8551/lp8552/lp8553/lp8555/lp8556/lp8557
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) Platform data for lp855x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) ------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) For supporting platform specific data, the lp855x platform data can be used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * name:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	Backlight driver name. If it is not defined, default name is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * device_control:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	Value of DEVICE CONTROL register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * initial_brightness:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	Initial value of backlight brightness.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * period_ns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	Platform specific PWM period value. unit is nano.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	Only valid when brightness is pwm input mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * size_program:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	Total size of lp855x_rom_data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * rom_data:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	List of new eeprom/eprom registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) Examples
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 1) lp8552 platform data: i2c register mode with new eeprom data::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)     #define EEPROM_A5_ADDR	0xA5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)     #define EEPROM_A5_VAL	0x4f	/* EN_VSYNC=0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)     static struct lp855x_rom_data lp8552_eeprom_arr[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	{EEPROM_A5_ADDR, EEPROM_A5_VAL},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)     };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)     static struct lp855x_platform_data lp8552_pdata = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	.name = "lcd-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	.device_control = I2C_CONFIG(LP8552),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	.initial_brightness = INITIAL_BRT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	.size_program = ARRAY_SIZE(lp8552_eeprom_arr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	.rom_data = lp8552_eeprom_arr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)     };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 2) lp8556 platform data: pwm input mode with default rom data::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)     static struct lp855x_platform_data lp8556_pdata = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	.device_control = PWM_CONFIG(LP8556),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	.initial_brightness = INITIAL_BRT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	.period_ns = 1000000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)     };