linux-kernel - Re: [PATCH v5 21/25] dt-bindings: media: imx258: Add binding for powerdown-gpio

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Date: Mon, 20 May 2024 21:04:58 +0200
From: Ondřej Jirman <megi@....cz>
To: Dave Stevenson <dave.stevenson@...pberrypi.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>, git@...gi311.com, 
	linux-media@...r.kernel.org, jacopo.mondi@...asonboard.com, mchehab@...nel.org, 
	robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de, 
	festevam@...il.com, devicetree@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, pavel@....cz, 
	phone-devel@...r.kernel.org, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v5 21/25] dt-bindings: media: imx258: Add binding for
 powerdown-gpio

Hi Dave,

On Mon, May 20, 2024 at 02:20:28PM GMT, Dave Stevenson wrote:
> Hi Ondřej
>
> [...]
> 
> From v3 [1] Luis reported testing dropping the powerdown-gpio on a PPP
> and it working fine.
> 
> I linked to the IMX258 datasheet in the same thread[2], and that
> datasheet does not include such a signal on the imx258 sensor itself.
> 
> If your module has a powerdown gpio, then you'll have to ask the
> module vendor what it is actually connected to. Potentially it relates
> to the VCM driver rather than the sensor.

I've tested it in various ways (inverting the signal, etc.) and it doesn't
seem to do anything. So these patches related to powerdown-gpio can
be dropped.

Kind regards,
	o.

>   Dave
> 
> [1] https://www.spinics.net/lists/linux-media/msg252519.html
> [2] https://www.spinics.net/lists/linux-media/msg252496.html