linux-kernel - Re: [PATCH v2 09/14] mfd: omap-usb-host: Add device tree support and binding information

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Date:	Mon, 11 Feb 2013 17:24:31 +0200
From:	Roger Quadros <rogerq@...com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"tony@...mide.com" <tony@...mide.com>,
	"b-cousson@...com" <b-cousson@...com>,
	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"kishon@...com" <kishon@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...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>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v2 09/14] mfd: omap-usb-host: Add device tree support
 and binding information

On 02/11/2013 02:00 PM, Mark Rutland wrote:
> On Thu, Feb 07, 2013 at 04:02:49PM +0000, Roger Quadros wrote:
>> Allows the OMAP HS USB host controller to be specified
>> via device tree.
>>
>> CC: Samuel Ortiz <sameo@...ux.intel.com>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>  .../devicetree/bindings/mfd/omap-usb-host.txt      |   80 ++++++++++
>>  drivers/mfd/omap-usb-host.c                        |  160 +++++++++++++++++++-
>>  2 files changed, 234 insertions(+), 6 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/mfd/omap-usb-host.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/omap-usb-host.txt b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
>> new file mode 100644
>> index 0000000..b381fa6
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
>> @@ -0,0 +1,80 @@
>> +OMAP HS USB Host
>> +
>> +Required properties:
>> +
>> +- compatible: should be "ti,usbhs-host"
>> +- reg: should contain one register range i.e. start and length
>> +- ti,hwmods: must contain "usb_host_hs"
>> +
>> +Optional properties:
>> +
>> +- num-ports: number of USB ports. Usually this is automatically detected
>> +  from the IP's revision register but can be overridden by specifying
>> +  this property. A maximum of 3 ports are supported at the moment.
>> +
>> +- portN-mode: String specifying the port mode for port N, where N can be
>> +  from 1 to 3. If the port mode is not specified, that port is treated
>> +  as unused. When specified, it must be one of the following.
>> +	"ehci-phy",
>> +        "ehci-tll",
>> +        "ehci-hsic",
>> +        "ohci-phy-6pin-datse0",
>> +        "ohci-phy-6pin-dpdm",
>> +        "ohci-phy-3pin-datse0",
>> +        "ohci-phy-4pin-dpdm",
>> +        "ohci-tll-6pin-datse0",
>> +        "ohci-tll-6pin-dpdm",
>> +        "ohci-tll-3pin-datse0",
>> +        "ohci-tll-4pin-dpdm",
>> +        "ohci-tll-2pin-datse0",
>> +        "ohci-tll-2pin-dpdm",
>> +
> 
> [...]
> 
>> +/**
>> + * Map 'enum usbhs_omap_port_mode' found in <linux/platform_data/usb-omap.h>
>> + * to the device tree binding portN-mode found in
>> + * 'Documentation/devicetree/bindings/mfd/omap-usb-host.txt'
>> + */
>> +static const char *port_modes[] = {
>> +	[OMAP_USBHS_PORT_MODE_UNUSED]	= "",
>> +	[OMAP_EHCI_PORT_MODE_PHY]	= "ehci-phy",
>> +	[OMAP_EHCI_PORT_MODE_TLL]	= "ehci-tll",
>> +	[OMAP_EHCI_PORT_MODE_HSIC]	= "ehci-hsic",
>> +	[OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0]	= "ohci-phy-6pin-datse0",
>> +	[OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM]	= "ohci-phy-6pin-dpdm",
>> +	[OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0]	= "ohci-phy-3pin-datse0",
>> +	[OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM]	= "ohci-phy-4pin-dpdm",
>> +	[OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0]	= "ohci-tll-6pin-datse0",
>> +	[OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM]	= "ohci-tll-6pin-dpdm",
>> +	[OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0]	= "ohci-tll-3pin-datse0",
>> +	[OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM]	= "ohci-tll-4pin-dpdm",
>> +	[OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0]	= "ohci-tll-2pin-datse0",
>> +	[OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM]	= "ohci-tll-2pin-dpdm",
>> +};
>> +
>> +/**
>> + * omap_usbhs_get_dt_port_mode - Get the 'enum usbhs_omap_port_mode'
>> + * from the port mode string.
>> + * @mode: The port mode string, usually obtained from device tree.
>> + *
>> + * The function returns the 'enum usbhs_omap_port_mode' that matches the
>> + * provided port mode string as per the port_modes table.
>> + * If no match is found it returns -ENODEV
>> + */
>> +static const int omap_usbhs_get_dt_port_mode(const char *mode)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(port_modes); i++) {
>> +		if (!strcasecmp(mode, port_modes[i]))
>> +			return i;
>> +	}
> 
> Any reason for using strcasecmp rather than strcmp? The binding only specified
> lower case versions, and this allows people to write "oHcI-PhY-6PiN-DaTsE0"
> with impunity.

:). No specific reason. I'll change it to strcmp.
> 
> Otherwise, this looks fine to me.

Thanks.

cheers,
-roger

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