linux-kernel - Re: [PATCH 02/89] dt-bindings: i2c: brcmstb: Add BCM2711 BSC/AUTO-I2C binding

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Message-ID: <20200225181500.GA538@bogus>
Date:   Tue, 25 Feb 2020 12:15:00 -0600
From:   Rob Herring <robh@...nel.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>, devicetree@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-i2c@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org,
        Maxime Ripard <maxime@...no.tech>
Subject: Re: [PATCH 02/89] dt-bindings: i2c: brcmstb: Add BCM2711
 BSC/AUTO-I2C  binding

On Mon, 24 Feb 2020 10:06:04 +0100, Maxime Ripard wrote:
> 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@...il.com>
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Wolfram Sang <wsa@...-dreams.de>
> Cc: bcm-kernel-feedback-list@...adcom.com
> Cc: linux-i2c@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml | 40 ++++++-
>  1 file changed, 39 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>