[PATCH v3] drm/bridge: ti-sn65dsi86: Check bridge connection failure

[Wolfram Sang]

On Tue, Mar 18, 2025 at 04:52:56PM +0100, Wolfram Sang wrote:
> Read out and check the ID registers, so we can bail out if I2C
> communication does not work or if the device is unknown. Tested on a
> Renesas GrayHawk board (R-Car V4M) by using a wrong I2C address and by
> not enabling RuntimePM for the device.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas at sang-engineering.com>
> ---
> 
> Changes since v2:
> * switched to a new approach suggested by Doug (Thanks!). We add a
>   dedicated read instead of using the first read. This prevents creating
>   the aux devices. As a side-gain, we check now if the chip at the address
>   is really the one we want to support.

Forgot to mention that it depends on my previous patch "[PATCH v2]
drm/bridge: ti-sn65dsi86: make use of debugfs_init callback"

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