linux-kernel - RE: [PATCH V2 7/9] interconnect: imx: set of

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Date:   Sat, 2 Jul 2022 12:48:45 +0000
From:   Peng Fan <peng.fan@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "djakov@...nel.org" <djakov@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>, Abel Vesa <abel.vesa@....com>,
        "abailon@...libre.com" <abailon@...libre.com>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "marex@...x.de" <marex@...x.de>,
        "paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
        "Markus.Niebel@...tq-group.com" <Markus.Niebel@...tq-group.com>,
        "aford173@...il.com" <aford173@...il.com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "abelvesa@...nel.org" <abelvesa@...nel.org>
Subject: RE: [PATCH V2 7/9] interconnect: imx: set of_node for interconnect
 provider

> Subject: Re: [PATCH V2 7/9] interconnect: imx: set of_node for interconnect
> provider
> 
> Am Donnerstag, dem 16.06.2022 um 15:33 +0800 schrieb Peng Fan (OSS):
> > From: Peng Fan <peng.fan@....com>
> >
> > The provider device is created using platform_device_register_data in
> > imx-bus driver, which not has of_node. With of_node set, it will be
> > easy to support QoS settings.
> >
> That's a bit dangerous, as sharing a of_node between two devices can lead
> to some reference counting issues IIRC, but then I also don't see a good way
> to do this any differently.

I just recalled there is a similar usage in usb code, I not remember the exact
file.

I thought not to let imx-bus.c to register the device, but I wanna to do all
these stuff step by step. The next step is to pick Abel's
https://lore.kernel.org/linux-arm-kernel/20220106164150.3474048-1-
abel.vesa@....com/

Abel told me he was trying to decouple imx-bus with icc.

Thanks,
Peng.


> 
> Regards,
> Lucas
> 
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  drivers/interconnect/imx/imx.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/interconnect/imx/imx.c
> > b/drivers/interconnect/imx/imx.c index 1f16eedea21c..78557fe6da2c
> > 100644
> > --- a/drivers/interconnect/imx/imx.c
> > +++ b/drivers/interconnect/imx/imx.c
> > @@ -264,6 +264,7 @@ int imx_icc_register(struct platform_device *pdev,
> >  	provider->xlate = of_icc_xlate_onecell;
> >  	provider->data = data;
> >  	provider->dev = dev->parent;
> > +	provider->dev->of_node = dev->parent->of_node;
> >  	platform_set_drvdata(pdev, imx_provider);
> >
> >  	ret = icc_provider_add(provider);
>