On 9/12/2016 6:49 PM, Rob Herring wrote:

On Thu, Sep 01, 2016 at 07:06:52PM +0530, Archit Taneja wrote:

quoted

Make the following changes in the HDMI gpio bindings:

- Use "-gpios" as the suffix for all the gpio names
- Move all the gpios to optional, since there are platforms that use none
   of them.
- The HPD gpio is a standard one, remove the "qcom,hdmi-tx-" prefix from
   it.
- Add a missing lpm gpio used on some platforms.

Make the necessary changes in the driver to incorporate these changes.

There hasn't been any upstream DT that uses the HDMI bindings, so it's
okay to change and move around these properties.

Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Archit Taneja <redacted>
---
v2:
- Keep "qcom,hdmi-tx-" suffix for all gpios except for hpd.
- Use "-gpios" suffix instead of "-gpio".
- Move all the gpios to optional properties.

  .../devicetree/bindings/display/msm/hdmi.txt        | 11 ++++++-----
  drivers/gpu/drm/msm/hdmi/hdmi.c                     | 21 +++++++++++++++++++--
  2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/msm/hdmi.txt b/Documentation/devicetree/bindings/display/msm/hdmi.txt
index ce84459..f1a83ab 100644
--- a/Documentation/devicetree/bindings/display/msm/hdmi.txt
+++ b/Documentation/devicetree/bindings/display/msm/hdmi.txt

@@ -13,17 +13,18 @@ Required properties:
  - interrupts: The interrupt signal from the hdmi block.
  - clocks: device clocks
    See ../clocks/clock-bindings.txt for details.
-- qcom,hdmi-tx-ddc-clk-gpio: ddc clk pin
-- qcom,hdmi-tx-ddc-data-gpio: ddc data pin
-- qcom,hdmi-tx-hpd-gpio: hpd pin
  - core-vdda-supply: phandle to supply regulator
  - hdmi-mux-supply: phandle to mux regulator
  - phys: the phandle for the HDMI PHY device
  - phy-names: the name of the corresponding PHY device

  Optional properties:
-- qcom,hdmi-tx-mux-en-gpio: hdmi mux enable pin
-- qcom,hdmi-tx-mux-sel-gpio: hdmi mux select pin
+- qcom,hdmi-tx-ddc-clk-gpios: ddc clk pin
+- qcom,hdmi-tx-ddc-data-gpios: ddc data pin

Sorry, for raising another point, but couldn't you use the i2c-gpio
binding for these instead?

I'm not entirely sure what these are used for either, they predate the
APQ8064 SoC. They are certainly not bit-banged to implement i2c, since
the driver just sets them to a high during driver initialization, and
we have our dedicated i2c controller anyway.

Rob,

Are you aware why we have these for older SoCs?

Thanks,
Archit

quoted

+- hpd-gpios: hpd pin
+- qcom,hdmi-tx-mux-en-gpios: hdmi mux enable pin
+- qcom,hdmi-tx-mux-sel-gpios: hdmi mux select pin
+- qcom,hdmi-tx-mux-lpm-gpios: hdmi mux lpm pin
  - power-domains: reference to the power domain(s), if available.
  - pinctrl-names: the pin control state names; should contain "default"
  - pinctrl-0: the default pinctrl state (active)

-- 
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