linux-kernel - Re: [PATCH v2 1/4] i2c: imx: only poll for bus busy in multi master mode

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Message-ID: <ZsiTMITWF0Tj3o8Q@eichest-laptop>
Date: Fri, 23 Aug 2024 15:48:32 +0200
From: Stefan Eichenberger <eichest@...il.com>
To: Andi Shyti <andi.shyti@...nel.org>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
	Frank.Li@....com, francesco.dolcini@...adex.com,
	linux-i2c@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stefan Eichenberger <stefan.eichenberger@...adex.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v2 1/4] i2c: imx: only poll for bus busy in multi master
 mode

Hi Andi,

On Fri, Aug 23, 2024 at 02:35:54AM +0200, Andi Shyti wrote:
> Hi,
> 
> On Thu, Aug 22, 2024 at 12:04:43PM GMT, Oleksij Rempel wrote:
> > On Thu, Aug 22, 2024 at 09:03:55AM +0200, Stefan Eichenberger wrote:
> > > Hi Andi,
> > > 
> > > On Thu, Aug 22, 2024 at 12:21:30AM +0200, Andi Shyti wrote:
> > > > Hi Stefan,
> > > > 
> > > > > @@ -1468,6 +1473,8 @@ static int i2c_imx_probe(struct platform_device *pdev)
> > > > >  		goto rpm_disable;
> > > > >  	}
> > > > >  
> > > > > +	i2c_imx->multi_master = of_property_read_bool(pdev->dev.of_node, "multi-master");
> > > > > +
> > > > 
> > > > you might also want to add the multi-master boolean property in
> > > > the binding.
> > > 
> > > We discussed this internally and weren't sure when it was required
> > > because e.g. i2c-rcar and i2c-tegra don't have it documented in their
> > > bindings. Is it still required if it is part of the dt-schema?
> > > https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/i2c/i2c-controller.yaml
> > 
> > The i2c-imx.yaml has "unevaluatedProperties: false", which fill discard
> > every thing not in this yaml
> > 
> > > If so, I will add it in the next version.
> > 
> > Yes, please.
> 
> sorry for the confusion, please don't add it. I had a chat with
> Krzysztof and I will quote him: "this is a core property, coming
> with dtschema, so they dont need to update bindings".
> 
> He also sent a cleanup to remove the only binding using it.

No problem, thanks for the clarification. 

Should I still separate the multi-master patch from the rest of the
series, even though it doesn't seem to fix the problem Fabio sees? I did
some more testing today and the workarounds he found do not solve the
problem I see, so they are definitely not the same.

Regards,
Stefan