mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 20:23:57 +08:00
05b01dd936
This patch enables getting a HPD GPIO descriptor quicker.
The exynos-hdmi driver uses "hpd" for HDMI hot plug detection.
static int hdmi_resources_init(struct hdmi_context *hdata)
{
...
hdata->hpd_gpio = devm_gpiod_get(dev, "hpd", GPIOD_IN);
...
}
This calls 'of_find_gpio()' and it generates the GPIO consumer ID by referring
GPIO suffix. So 'hpd-gpios' is preferred on getting a GPIO descriptor.
However, if the device tree uses 'hpd-gpio', then the exynos-hdmi driver
always retries to get a GPIO descriptor because the first GPIO suffix is not
'gpio' but 'gpios'. So you always see the debug message below.
of_get_named_gpiod_flags: can't parse 'hpd-gpios' property of node '/soc/hdmi@14530000[0]'
Use the preferred property, 'hpd-gpios' instead of 'hpd-gpio'.
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
64 lines
2.5 KiB
Plaintext
64 lines
2.5 KiB
Plaintext
Device-Tree bindings for drm hdmi driver
|
|
|
|
Required properties:
|
|
- compatible: value should be one among the following:
|
|
1) "samsung,exynos4210-hdmi"
|
|
2) "samsung,exynos4212-hdmi"
|
|
3) "samsung,exynos5420-hdmi"
|
|
4) "samsung,exynos5433-hdmi"
|
|
- reg: physical base address of the hdmi and length of memory mapped
|
|
region.
|
|
- interrupts: interrupt number to the cpu.
|
|
- hpd-gpios: following information about the hotplug gpio pin.
|
|
a) phandle of the gpio controller node.
|
|
b) pin number within the gpio controller.
|
|
c) optional flags and pull up/down.
|
|
- ddc: phandle to the hdmi ddc node
|
|
- phy: phandle to the hdmi phy node
|
|
- samsung,syscon-phandle: phandle for system controller node for PMU.
|
|
|
|
Required properties for Exynos 4210, 4212, 5420 and 5433:
|
|
- clocks: list of clock IDs from SoC clock driver.
|
|
a) hdmi: Gate of HDMI IP bus clock.
|
|
b) sclk_hdmi: Gate of HDMI special clock.
|
|
c) sclk_pixel: Pixel special clock, one of the two possible inputs of
|
|
HDMI clock mux.
|
|
d) sclk_hdmiphy: HDMI PHY clock output, one of two possible inputs of
|
|
HDMI clock mux.
|
|
e) mout_hdmi: It is required by the driver to switch between the 2
|
|
parents i.e. sclk_pixel and sclk_hdmiphy. If hdmiphy is stable
|
|
after configuration, parent is set to sclk_hdmiphy else
|
|
sclk_pixel.
|
|
- clock-names: aliases as per driver requirements for above clock IDs:
|
|
"hdmi", "sclk_hdmi", "sclk_pixel", "sclk_hdmiphy" and "mout_hdmi".
|
|
|
|
Required properties for Exynos 5433:
|
|
- clocks: list of clock specifiers according to common clock bindings.
|
|
a) hdmi_pclk: Gate of HDMI IP APB bus.
|
|
b) hdmi_i_pclk: Gate of HDMI-PHY IP APB bus.
|
|
d) i_tmds_clk: Gate of HDMI TMDS clock.
|
|
e) i_pixel_clk: Gate of HDMI pixel clock.
|
|
f) i_spdif_clk: Gate of HDMI SPDIF clock.
|
|
g) oscclk: Oscillator clock, used as parent of following *_user clocks
|
|
in case HDMI-PHY is not operational.
|
|
h) tmds_clko: TMDS clock generated by HDMI-PHY.
|
|
i) tmds_clko_user: MUX used to switch between oscclk and tmds_clko,
|
|
respectively if HDMI-PHY is off and operational.
|
|
j) pixel_clko: Pixel clock generated by HDMI-PHY.
|
|
k) pixel_clko_user: MUX used to switch between oscclk and pixel_clko,
|
|
respectively if HDMI-PHY is off and operational.
|
|
- clock-names: aliases for above clock specfiers.
|
|
- samsung,sysreg: handle to syscon used to control the system registers.
|
|
|
|
Example:
|
|
|
|
hdmi {
|
|
compatible = "samsung,exynos4212-hdmi";
|
|
reg = <0x14530000 0x100000>;
|
|
interrupts = <0 95 0>;
|
|
hpd-gpios = <&gpx3 7 1>;
|
|
ddc = <&hdmi_ddc_node>;
|
|
phy = <&hdmi_phy_node>;
|
|
samsung,syscon-phandle = <&pmu_system_controller>;
|
|
};
|