linux-kernel - Re: [PATCH 11/11] drm/bridge: tc358768: Add DRM_BRIDGE_ATTACH_NO

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Date:   Fri, 11 Aug 2023 19:58:17 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Péter Ujfalusi <peter.ujfalusi@...il.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Francesco Dolcini <francesco@...cini.it>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Aradhya Bhatia <a-bhatia1@...com>
Subject: Re: [PATCH 11/11] drm/bridge: tc358768: Add
 DRM_BRIDGE_ATTACH_NO_CONNECTOR support

On 11/08/2023 19:44, Péter Ujfalusi wrote:
> 
> 
> On 04/08/2023 13:44, Tomi Valkeinen wrote:
> 
> I would rather have a commit message than a blank one.

Oops...

>> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
>> ---
>>   drivers/gpu/drm/bridge/tc358768.c | 64 +++++++++++++++++++++++++++------------
>>   1 file changed, 45 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
>> index ea19de5509ed..a567f136ddc7 100644
>> --- a/drivers/gpu/drm/bridge/tc358768.c
>> +++ b/drivers/gpu/drm/bridge/tc358768.c
>> @@ -131,8 +131,17 @@ static const char * const tc358768_supplies[] = {
>>   
>>   struct tc358768_dsi_output {
>>   	struct mipi_dsi_device *dev;
>> +
>> +	/* Legacy field if DRM_BRIDGE_ATTACH_NO_CONNECTOR is not used */
>>   	struct drm_panel *panel;
>> -	struct drm_bridge *bridge;
>> +
>> +	/*
>> +	 * If DRM_BRIDGE_ATTACH_NO_CONNECTOR is not used and a panel is attached
>> +	 * to tc358768, 'next_bridge' contains the bridge the driver created
>> +	 * with drm_panel_bridge_add_typed(). Otherwise 'next_bridge' contains
>> +	 * the next bridge the driver found.
>> +	 */
>> +	struct drm_bridge *next_bridge;
> 
> why it is better to call it next_bridge than just bridge? Is there a
> prev_bridge also?

There is, prev bridge would be the bridge behind tc358768 in the chain. 
Bridge is tc358768. Next bridge is the following one.

Here, it's in the tc358768_dsi_output struct, so bridge is perhaps ok. I 
just wanted to be extra clear here, as I think it's often called 
next_bridge in other drivers.

  Tomi