linux-kernel - Re: [PATCH v1 1/2] dt/bindings/usb: Add bindings for PIC32 MUSB driver.

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Date:	Thu, 7 Apr 2016 18:32:02 +0530
From:	Purna Chandra Mandal <purna.mandal@...rochip.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	<linux-kernel@...r.kernel.org>
CC:	Rob Herring <robh+dt@...nel.org>, <linux-usb@...r.kernel.org>,
	Joshua Henderson <digitalpeer@...italpeer.com>,
	<devicetree@...r.kernel.org>, Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v1 1/2] dt/bindings/usb: Add bindings for PIC32 MUSB
 driver.

On 04/07/2016 06:23 PM, Sergei Shtylyov wrote:

> Hello.
>
> On 4/7/2016 2:16 PM, Purna Chandra Mandal wrote:
>
>> Document devicetree binding for the USB controller
>
>    Device tree.
>
ack.

>> and USB Phy found on Microchip PIC32 class devices.
>
>    PHY.
>
ack.

>> Signed-off-by: Purna Chandra Mandal <purna.mandal@...rochip.com>
>>
>> ---
>>
>>   .../bindings/usb/microchip,pic32-musb.txt          | 67 ++++++++++++++++++++++
>>   1 file changed, 67 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/usb/microchip,pic32-musb.txt
>>
>> diff --git a/Documentation/devicetree/bindings/usb/microchip,pic32-musb.txt b/Documentation/devicetree/bindings/usb/microchip,pic32-musb.txt
>> new file mode 100644
>> index 0000000..e1cec9d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/usb/microchip,pic32-musb.txt
>> @@ -0,0 +1,67 @@
>> +Microchip PIC32 MUSB DRC/OTG controller
>> +-------------------------------------------
>> +
>> +Required properties:
>> + - compatible       : should be "microchip,pic32mzda-usb".
>> + - reg              : offset and length of "MUSB Core Registers" and
>> +                      "USB Clock & Reset Registers".
>> + - reg-names        : should be "mc", and "usbcr" in order
>> + - clocks           : clock specifier for the musb controller clock
>> + - clock-names      : should be "usb_clk"
>> + - interrupts       : interrupt number for MUSB Core General interrupt
>> +                      and DMA interrupt
>> + - interrupt-names  : must be "mc" and "dma" in order.
>> + - phys             : phy specifier for the otg phy.
>> + - dr_mode          : should be one of "host", "peripheral" or "otg".
>> + - mentor,multipoint: Should be "1" indicating the musb controller supports
>> +                      multipoint. This is MUSB configuration-specific setting.
>> + - mentor,num-eps   : Specifies the number of endpoints. This is also a
>> +                      MUSB configuration-specific setting. Should be set to "8".
>> + - mentor,ram-bits  : Specifies the ram address size. Should be set to "11".
>> + - mentor,power     : Should be "500". This signifies the controller can supply
>> +                      up to 500mA when operating in host mode.
>
>    No, these "nentor" prefixed parameters must be determined from the "compatible" prop.
>
Prefix "mentor" here is used to signify configuration of the MUSB controller IP, not
specifics of the chip or glue logic.
Please suggest if replacing with "microchip" makes it better.

>> + - phys             : phandle of the USB phy.
>> + - usb_overcurrent  : phandle to MUSB over-current note. It should have
>
>    s/note/node/? Also,
>    Also, hyphens are preferred to underscores in the device trees.
>
ack. Will use hyphen.

>> +                      interrupt number for over-current detection logic.
>> +
>> +Optional properties:
>> + - microchip,fifo-mode: Specifies layout of internal SRAM for end-point fifos.
>> +                        Should be 0 (default) or 1.
>> +
>> +Example:
>> +    aliases {
>> +        usb1 = &usb1;
>> +        phy1 = &usb1_phy;
>> +    };
>> +
>> +    usb1: hsusb1_core@...e3000 {
>
>    The ePAPR standard tells us to use the generic names, not chip specific, the name standardized in this case is "usb@...".
>
ack.

>> +        compatible = "microchip,pic32mzda-usb";
>> +        reg = <0x1f8e3000 0x1000>,
>> +              <0x1f884000 0x1000>;
>> +        reg-names = "mc", "usbcr";
>> +        interrupts = <132 IRQ_TYPE_EDGE_RISING>,
>> +                 <133 IRQ_TYPE_LEVEL_HIGH>;
>> +        interrupt-names = "mc", "dma";
>> +        dr_mode = "host";
>> +        mentor,multipoint = <1>;
>> +        mentor,num-eps = <8>;
>> +        mentor,ram-bits = <11>;
>> +        mentor,power = <500>;
>> +        phys = <&usb1_phy>;
>> +        clocks = <&rootclk PB5CLK>;
>> +        clock-names = "usb_clk";
>> +        usb_overcurrent = <&usb1_overcurrent>;
>> +    };
>> +
>> +    usb1_phy: hsusb1_phy@...e4000 {
>
>    "usb-phy@..."
>
ack.

>> +        compatible = "usb-nop-xceiv";
>> +        reg = <0x1f8e4000 0x1000>;
>> +        clocks = <&rootclk UPLLCLK>;
>> +        clock-names = "main_clk";
>> +        clock-frequency = <24000000>;
>> +    };
>> +
>> +    usb1_overcurrent: hsusb1_oc@0 {
>
>    "usb-overcurrent@...", perhaps?
>
ack.

>> +        interrupt-parent = <&gpio1>;
>> +        interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
>> +    };
>
> MBR, Sergei
>