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97 lines
2.5 KiB
Diff
97 lines
2.5 KiB
Diff
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From 16a6810e521eaf24249085b93b467f7bdf8e8a47 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Tue, 17 Dec 2019 09:58:34 +0100
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Subject: [PATCH] dt-bindings: i2c: brcmstb: Add BCM2711 BSC/AUTO-I2C
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binding
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The HDMI blocks in the BCM2771 have an i2c controller to retrieve the
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EDID. This block is split into two parts, the BSC and the AUTO_I2C,
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lying in two separate register areas.
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The AUTO_I2C block has a mailbox-like interface and will take away the
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BSC control from the CPU if enabled. However, the BSC is the actually
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the same controller than the one supported by the brcmstb driver, and
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the AUTO_I2C doesn't really bring any immediate benefit.
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We can model it in the DT as a single device with two register range,
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which will allow us to use or or the other in the driver without
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changing anything in the DT.
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Cc: Kamal Dasu <kdasu.kdev@gmail.com>
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Cc: Wolfram Sang <wsa@the-dreams.de>
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Cc: bcm-kernel-feedback-list@broadcom.com
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Cc: linux-i2c@vger.kernel.org
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Cc: devicetree@vger.kernel.org
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Acked-by: Florian Fainelli <f.fainelli@gmail.com>
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Reviewed-by: Rob Herring <robh+dt@kernel.org>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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.../bindings/i2c/brcm,brcmstb-i2c.yaml | 40 ++++++++++++++++++-
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1 file changed, 39 insertions(+), 1 deletion(-)
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--- a/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml
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+++ b/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml
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@@ -15,11 +15,21 @@ allOf:
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properties:
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compatible:
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enum:
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+ - brcm,bcm2711-hdmi-i2c
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- brcm,brcmstb-i2c
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- brcm,brcmper-i2c
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reg:
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- maxItems: 1
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+ minItems: 1
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+ maxItems: 2
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+ items:
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+ - description: BSC register range
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+ - description: Auto-I2C register range
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+
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+ reg-names:
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+ items:
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+ - const: bsc
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+ - const: auto-i2c
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interrupts:
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maxItems: 1
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@@ -45,6 +55,26 @@ required:
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unevaluatedProperties: false
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+if:
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+ properties:
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+ compatible:
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+ contains:
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+ enum:
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+ - brcm,bcm2711-hdmi-i2c
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+
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+then:
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+ properties:
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+ reg:
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+ minItems: 2
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+
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+ required:
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+ - reg-names
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+
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+else:
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+ properties:
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+ reg:
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+ maxItems: 1
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+
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examples:
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- |
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bsca: i2c@f0406200 {
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@@ -56,4 +86,12 @@ examples:
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interrupt-names = "upg_bsca";
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};
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+ - |
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+ ddc0: i2c@7ef04500 {
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+ compatible = "brcm,bcm2711-hdmi-i2c";
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+ reg = <0x7ef04500 0x100>, <0x7ef00b00 0x300>;
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+ reg-names = "bsc", "auto-i2c";
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+ clock-frequency = <390000>;
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+ };
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+
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...
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