linux-kernel - Re: [PATCH v1 3/3] phy: cygnus-usbphy: Add Broadcom Cygnus USB phy driver

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Date:	Thu, 26 Mar 2015 05:31:02 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Dmitry Torokhov <dtor@...gle.com>
CC:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-kernel@...r.kernel.org>, Anatol Pomazau <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>
Subject: Re: [PATCH v1 3/3] phy: cygnus-usbphy: Add Broadcom Cygnus USB phy
 driver



On Thursday 26 March 2015 04:12 AM, Dmitry Torokhov wrote:
> Hi Kishon,
> 
> On Thu, Mar 26, 2015 at 03:58:50AM +0530, Kishon Vijay Abraham I wrote:
>> Hi,
>>
>> On Saturday 21 March 2015 02:55 AM, Arun Ramamurthy wrote:
>>> +struct bcm_phy_driver {
>>> +	void __iomem *usbphy_regs;
>>> +	void __iomem *usb2h_idm_regs;
>>> +	void __iomem *usb2d_idm_regs;
>>> +	struct bcm_phy_instance *ports[MAX_PHY_PORTS];
>>
>> er.. can't we allocate this dynamically?
> 
> The chip has support for only 3 phys, so I believe allocating array of 3
> pointers is simplest.
> 
> [...]
> 
>>> +
>>> +static struct phy *bcm_usb_phy_xlate(struct device *dev,
>>> +				     struct of_phandle_args *args)
>>> +{
>>> +	struct bcm_phy_driver *phy_driver = dev_get_drvdata(dev);
>>> +	struct bcm_phy_instance *port = NULL;
>>> +	int i;
>>> +
>>> +	if (!phy_driver)
>>> +		return ERR_PTR(-EINVAL);
>>> +
>>> +	if (WARN_ON(args->args_count != 1))
>>> +		return ERR_PTR(-EINVAL);
>>> +
>>> +	if (WARN_ON(args->args[0] < 0 || args->args[0] > 1))
>>> +		return ERR_PTR(-EINVAL);
>>> +
>>> +	for (i = 0; i < ARRAY_SIZE(phy_driver->ports); i++) {
>>> +		struct bcm_phy_instance *p = phy_driver->ports[i];
>>> +
>>> +		if (p && p->generic_phy->dev.of_node == args->np) {
>>> +			port = p;
>>> +			break;
>>> +		}
>>> +	}
>>> +
>>> +	if (!port) {
>>> +		dev_err(dev, "Failed to locate phy %s\n", args->np->name);
>>> +		return ERR_PTR(-EINVAL);
>>> +	}
>>> +
>>> +	port->host_mode = args->args[0];
>>> +
>>> +	return port->generic_phy;
>>> +}
>>
>> The xlate function here shouldn't be needed at all. Use of_phy_simple_xlate
>> instead.
> 
> of_phy_simple_xlate() will not allow specifying host vs device mode when
> requesting phy though...

indeed!

-Kishon
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