The HDMI blocks in the BCM2771 have an i2c controller to retrieve the EDID. This block is split into two parts, the BSC and the AUTO_I2C, lying in two separate register areas.
The AUTO_I2C block has a mailbox-like interface and will take away the BSC control from the CPU if enabled. However, the BSC is the actually the same controller than the one supported by the brcmstb driver, and the AUTO_I2C doesn't really bring any immediate benefit.
We can model it in the DT as a single device with two register range, which will allow us to use or or the other in the driver without changing anything in the DT.
Cc: Kamal Dasu kdasu.kdev@gmail.com Cc: Florian Fainelli f.fainelli@gmail.com Cc: Rob Herring robh+dt@kernel.org Cc: Wolfram Sang wsa@the-dreams.de Cc: bcm-kernel-feedback-list@broadcom.com Cc: linux-i2c@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Maxime Ripard maxime@cerno.tech --- Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml | 40 ++++++- 1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml b/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml index 3189d74096e8..edbca2476128 100644 --- a/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml @@ -15,11 +15,21 @@ allOf: properties: compatible: enum: + - brcm,bcm2711-hdmi-i2c - brcm,brcmstb-i2c - brcm,brcmper-i2c
reg: - maxItems: 1 + minItems: 1 + maxItems: 2 + items: + - description: BSC register range + - description: Auto-I2C register range + + reg-names: + items: + - const: bsc + - const: auto-i2c
interrupts: maxItems: 1 @@ -45,6 +55,26 @@ required:
unevaluatedProperties: false
+if: + properties: + compatible: + contains: + enum: + - brcm,bcm2711-hdmi-i2c + +then: + properties: + reg: + minItems: 2 + + required: + - reg-names + +else: + properties: + reg: + maxItems: 1 + examples: - | bsca: i2c@f0406200 { @@ -56,4 +86,12 @@ examples: interrupt-names = "upg_bsca"; };
+ - | + ddc0: i2c@7ef04500 { + compatible = "brcm,bcm2711-hdmi-i2c"; + reg = <0x7ef04500 0x100>, <0x7ef00b00 0x300>; + reg-names = "bsc", "auto-i2c"; + clock-frequency = <390000>; + }; + ...