linux-kernel - Re: [RFC v2 11/13] usb: port: Parse pwrseq phandle from Device Tree

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Message-ID: <e8f310b5-4fe8-3eb2-2d17-b1d9077daea2@osg.samsung.com>
Date:	Thu, 5 May 2016 16:10:04 -0400
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>
Cc:	tjakobi@...h.uni-bielefeld.de, m.szyprowski@...sung.com,
	hverkuil@...all.nl,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RFC v2 11/13] usb: port: Parse pwrseq phandle from Device Tree

Hello Krzysztof,

On 05/05/2016 08:34 AM, Krzysztof Kozlowski wrote:
> Parse usb-pwrseq property from Device Tree to get the phandle to pwrseq
> device. The pwrseq device will be used by USB hub to cycle the power
> before activating ports.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---

[snip]

>  
> @@ -532,6 +534,14 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
>  		return retval;
>  	}
>  
> +	port_dev->dev.of_node = usb_of_get_child_node(hub->hdev->dev.of_node, port1);
> +	port_dev->pwrseq = pwrseq_alloc(&port_dev->dev);
> +	if (IS_ERR(port_dev->pwrseq)) {
> +		device_unregister(&port_dev->dev);
> +		/* TODO: what about EPROBE_DEFER? */

I think it's OK since the call chain is:

hub_probe()
       hub_configure()
              usb_hub_create_port_device()

so the hub_probe() will be deferred if the usb-pwrseq was not registered yet.
Unless I misunderstood your question :)

Anyway, patch looks good to me:

Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
 
Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America