linux-kernel - Re: [PATCH v5 5/6] usb: chipidea: let chipidea core device of_node equal's glue layer device of

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Date:	Tue, 09 Aug 2016 17:15:36 -0700
From:	Stephen Boyd <stephen.boyd@...aro.org>
To:	Peter Chen <peter.chen@....com>, gregkh@...uxfoundation.org,
	stern@...land.harvard.edu, ulf.hansson@...aro.org,
	broonie@...nel.org, sre@...nel.org, robh+dt@...nel.org,
	shawnguo@...nel.org, dbaryshkov@...il.com, dwmw3@...radead.org
Cc:	k.kozlowski@...sung.com, linux-arm-kernel@...ts.infradead.org,
	p.zabel@...gutronix.de, devicetree@...r.kernel.org,
	pawel.moll@....com, mark.rutland@....com,
	linux-usb@...r.kernel.org, arnd@...db.de, s.hauer@...gutronix.de,
	mail@...iej.szmigiero.name, troy.kisky@...ndarydevices.com,
	festevam@...il.com, oscar@...andei.net, linux-pm@...r.kernel.org,
	stillcompiling@...il.com, linux-kernel@...r.kernel.org,
	mka@...omium.org, "Peter Chen" <peter.chen@...escale.com>
Subject: Re: [PATCH v5 5/6] usb: chipidea: let chipidea core device of_node equal's
 glue layer device of_node

Quoting Peter Chen (2016-08-08 01:52:10)
> From: Peter Chen <peter.chen@...escale.com>
> 
> At device tree, we have no device node for chipidea core,
> the glue layer's node is the parent node for host and udc
> device. But in related driver, the parent device is chipidea
> core. So, in order to let the common driver get parent's node,
> we let the core's device node equals glue layer device node.
> 
> Signed-off-by: Peter Chen <peter.chen@...escale.com>
> Tested-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
> Tested-by Joshua Clayton <stillcompiling@...il.com>
> ---
>  drivers/usb/chipidea/core.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 69426e6..b189dc7 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -954,6 +954,15 @@ static int ci_hdrc_probe(struct platform_device *pdev)
>                 dev_err(dev, "unable to init phy: %d\n", ret);
>                 return ret;
>         }
> +       /*
> +        * At device tree, we have no device node for chipidea core,
> +        * the glue layer's node is the parent node for host and udc
> +        * device. But in related driver, the parent device is chipidea
> +        * core. So, in order to let the common driver get parent's node,
> +        * we let the core's device node equals glue layer's node.
> +        */
> +       if (dev->parent && dev->parent->of_node)
> +               dev->of_node = dev->parent->of_node;

Can this be done earlier? Perhaps after hw_device_init() in this probe
routine? That would allow me to remove the awkward parent searching in
my ULPI DT awareness patch.