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| author | Hans de Goede <hdegoede@redhat.com> | 2017-01-22 17:14:09 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2017-02-10 15:15:38 +0100 |
| commit | bf7696a12071afaca0139d7b8b9eadfc77252876 (patch) | |
| tree | ac49357f16fdc4f5cd506002e61a2ed1dbc9067c /drivers/acpi | |
| parent | 3aeeb37569a983a1254d7d908e9b1a279765bf67 (diff) | |
| download | linux-bf7696a12071afaca0139d7b8b9eadfc77252876.tar.gz linux-bf7696a12071afaca0139d7b8b9eadfc77252876.tar.bz2 linux-bf7696a12071afaca0139d7b8b9eadfc77252876.zip | |
acpi: lpss: call pwm_add_table() for BSW PWM device
On x86 we do not have devicetree to link the PWM controller and
the display controller together. So someone needs to call
pwm_add_table() to create the link, so that the i915 driver's
pwm_get(dev, "pwm_backlight") call returns the lpss' pwm0.
The PWM subsystem does not want to have pwm_add_table() calls
directly in PWM drivers (this leads to probe ordering issues),
so lets do it here since the acpi-lpss code is always builtin.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 8ea836c046f8..cd5d2b6c9ed1 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -20,6 +20,7 @@ #include <linux/platform_data/clk-lpss.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> +#include <linux/pwm.h> #include <linux/delay.h> #include "internal.h" @@ -154,6 +155,18 @@ static void byt_i2c_setup(struct lpss_private_data *pdata) writel(0, pdata->mmio_base + LPSS_I2C_ENABLE); } +/* BSW PWM used for backlight control by the i915 driver */ +static struct pwm_lookup bsw_pwm_lookup[] = { + PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0", + "pwm_backlight", 0, PWM_POLARITY_NORMAL, + "pwm-lpss-platform"), +}; + +static void bsw_pwm_setup(struct lpss_private_data *pdata) +{ + pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup)); +} + static const struct lpss_device_desc lpt_dev_desc = { .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR, .prv_offset = 0x800, @@ -191,6 +204,7 @@ static const struct lpss_device_desc byt_pwm_dev_desc = { static const struct lpss_device_desc bsw_pwm_dev_desc = { .flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY, + .setup = bsw_pwm_setup, }; static const struct lpss_device_desc byt_uart_dev_desc = { |