linux-kernel - Re: [PATCH v2 1/2] usb: doc: udc-xilinx: Add devicetree bindings

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Date:	Fri, 04 Apr 2014 07:52:04 +0200
From:	Michal Simek <monstr@...str.eu>
To:	balbi@...com
CC:	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	michals@...inx.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
Subject: Re: [PATCH v2 1/2] usb: doc: udc-xilinx: Add devicetree bindings

On 04/03/2014 04:59 PM, Felipe Balbi wrote:
> On Thu, Apr 03, 2014 at 01:05:18PM +0530, Subbaraya Sundeep Bhatta wrote:
>> Add devicetree bindings for Xilinx axi udc driver.
>>
>> Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
>> ---
>> Changes for v2:
>> 	- replaced xlnx,include-dma with xlnx,has-builtin-dma
>>
>>  .../devicetree/bindings/usb/udc-xilinx.txt         |   20 ++++++++++++++++++++
>>  1 files changed, 20 insertions(+), 0 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/usb/udc-xilinx.txt
>>
>> diff --git a/Documentation/devicetree/bindings/usb/udc-xilinx.txt b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
>> new file mode 100644
>> index 0000000..7c24fac
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
>> @@ -0,0 +1,20 @@
>> +Xilinx AXI USB2 device controller
>> +
>> +Required properties:
>> +- compatible		: Should be "xlnx,axi-usb2-device-4.00.a"
>> +- reg			: Physical base address and size of the Axi USB2
>> +			  device registers map.
>> +- interrupts		: Property with a value describing the interrupt
>> +			  number.
>> +- interrupt-parent	: Must be core interrupt controller
>> +- xlnx,has-builtin-dma	: if DMA is included
> 
> isn't there a configuration register to tell you this ?

I have checked this with Sundeep and there is nothing like that in the HW.

> 
>> +
>> +Example:
>> + 		axi-usb2-device@...00000 {
>> +                        compatible = "xlnx,axi-usb2-device-4.00.a";
>> +                        interrupt-parent = <0x1>;
> 
> why isn't interrupt-parent a phandle ?

Just for the record: Using number here should be also fine because DTC
is converting it to numbers with linux,phandle and phandle.
[linux-next]$ dtc -O dts -I dtb /tftpboot/devicetree.dtb | less
...
                ps7-scugic@...01000 {
                        #address-cells = <0x2>;
                        #interrupt-cells = <0x3>;
                        #size-cells = <0x1>;
                        compatible = "arm,cortex-a9-gic", "arm,gic";
                        interrupt-controller;
                        num_cpus = <0x2>;
                        num_interrupts = <0x60>;
                        reg = <0xf8f01000 0x1000 0xf8f00100 0x100>;
                        linux,phandle = <0x3>;
                        phandle = <0x3>;
                };

                ps7-scutimer@...00600 {
                        clocks = <0x2 0x4>;
                        compatible = "arm,cortex-a9-twd-timer";
                        interrupt-parent = <0x3>;
                        interrupts = <0x1 0xd 0x301>;
                        reg = <0xf8f00600 0x20>;
                };
...

but anyway Sundeep with change it to any sensible value <&intc>;

Thanks for pointing to it,
Michal


-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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