diff options
Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 5edfd9c49044..10347e3d73ad 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -143,6 +143,22 @@ static void lpss_deassert_reset(struct lpss_private_data *pdata) writel(val, pdata->mmio_base + offset); } +/* + * BYT PWM used for backlight control by the i915 driver on systems without + * the Crystal Cove PMIC. + */ +static struct pwm_lookup byt_pwm_lookup[] = { + PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0", + "pwm_backlight", 0, PWM_POLARITY_NORMAL, + "pwm-lpss-platform"), +}; + +static void byt_pwm_setup(struct lpss_private_data *pdata) +{ + if (!acpi_dev_present("INT33FD", NULL, -1)) + pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup)); +} + #define LPSS_I2C_ENABLE 0x6c static void byt_i2c_setup(struct lpss_private_data *pdata) @@ -200,6 +216,7 @@ static const struct lpss_device_desc lpt_sdio_dev_desc = { static const struct lpss_device_desc byt_pwm_dev_desc = { .flags = LPSS_SAVE_CTX, + .setup = byt_pwm_setup, }; static const struct lpss_device_desc bsw_pwm_dev_desc = { |