1 files changed, 96 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0512-dt-bindings-i2c-brcmstb-Add-BCM2711-BSC-AUTO-I2C-bin.patch b/target/linux/bcm27xx/patches-5.4/950-0512-dt-bindings-i2c-brcmstb-Add-BCM2711-BSC-AUTO-I2C-bin.patch
new file mode 100644
index 0000000000..2716a13d25
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0512-dt-bindings-i2c-brcmstb-Add-BCM2711-BSC-AUTO-I2C-bin.patch
@@ -0,0 +1,96 @@
+From 16a6810e521eaf24249085b93b467f7bdf8e8a47 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Tue, 17 Dec 2019 09:58:34 +0100
+Subject: [PATCH] dt-bindings: i2c: brcmstb: Add BCM2711 BSC/AUTO-I2C
+ binding
+
+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: Wolfram Sang <wsa@the-dreams.de>
+Cc: bcm-kernel-feedback-list@broadcom.com
+Cc: linux-i2c@vger.kernel.org
+Cc: devicetree@vger.kernel.org
+Acked-by: Florian Fainelli <f.fainelli@gmail.com>
+Reviewed-by: Rob Herring <robh+dt@kernel.org>
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ .../bindings/i2c/brcm,brcmstb-i2c.yaml        | 40 ++++++++++++++++++-
+ 1 file changed, 39 insertions(+), 1 deletion(-)
+
+--- 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>;
++      };
++
+ ...