From bf7696a12071afaca0139d7b8b9eadfc77252876 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 22 Jan 2017 17:14:09 +0100 Subject: 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 Acked-by: Rafael J. Wysocki Signed-off-by: Thierry Reding --- drivers/acpi/acpi_lpss.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/acpi') 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 #include #include +#include #include #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 = { -- cgit v1.2.3