linux-kernel - Re: [PATCHv3 1/2] dt-bindings: usb: typec: anx7688: start a binding document

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Date: Thu, 11 Apr 2024 23:17:34 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Ondřej Jirman <megi@....cz>, 
	Pavel Machek <pavel@....cz>, phone-devel@...r.kernel.org, 
	kernel list <linux-kernel@...r.kernel.org>, fiona.klute@....de, martijn@...xit.nl, samuel@...lland.org, 
	heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org, linux-usb@...r.kernel.org, 
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org
Subject: Re: [PATCHv3 1/2] dt-bindings: usb: typec: anx7688: start a binding
 document

On Thu, Apr 11, 2024 at 09:59:35PM +0200, Krzysztof Kozlowski wrote:
> On 10/04/2024 04:20, Ondřej Jirman wrote:
> > On Mon, Apr 08, 2024 at 10:12:30PM GMT, Krzysztof Kozlowski wrote:
> >> On 08/04/2024 17:17, Ondřej Jirman wrote:
> >>>
> >>> Now for things to not fail during suspend/resume based on PM callbacks
> >>> invocation order, anx7688 driver needs to enable this regulator too, as long
> >>> as it needs it.
> >>
> >> No, the I2C bus driver needs to manage it. Not one individual I2C
> >> device. Again, why anx7688 is specific? If you next phone has anx8867,
> >> using different driver, you also add there i2c-supply? And if it is
> >> nxp,ptn5100 as well?
> > 
> > Yes, that could work, if I2C core would manage this.
> 
> Either I don't understand about which I2C regulator you speak or this is
> not I2C core regulator. This is a regulator to be managed by the I2C
> controller, not by I2C core.

If it is a supply that pulls up the SDA/SCL lines, then it is generic
enough to be handled by the core. For example, on Qualcomm platforms CCI
lines also usually have external supply as a pull-up.


-- 
With best wishes
Dmitry