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Date: Fri, 7 Jun 2019 12:25:57 +0300
From: Roger Quadros <rogerq@...com>
To: Pawel Laszczak <pawell@...ence.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"hdegoede@...hat.com" <hdegoede@...hat.com>,
"heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"jbergsagel@...com" <jbergsagel@...com>,
"nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
Suresh Punnoose <sureshp@...ence.com>,
"peter.chen@....com" <peter.chen@....com>,
Jayshri Dajiram Pawar <jpawar@...ence.com>,
Rahul Kumar <kurahul@...ence.com>
Subject: Re: [PATCH v7 1/6] dt-bindings: add binding for USBSS-DRD controller.
On 07/06/2019 07:46, Pawel Laszczak wrote:
>
>>
>> Pawel,
>>
>> On 05/06/2019 13:03, Pawel Laszczak wrote:
>>> This patch aim at documenting USB related dt-bindings for the
>>> Cadence USBSS-DRD controller.
>>>
>>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>>> Reviewed-by: Rob Herring <robh@...nel.org>
>>>
>>> ---
>>> .../devicetree/bindings/usb/cdns-usb3.txt | 30 +++++++++++++++++++
>>> 1 file changed, 30 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/usb/cdns-usb3.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/cdns-usb3.txt b/Documentation/devicetree/bindings/usb/cdns-usb3.txt
>>> new file mode 100644
>>> index 000000000000..1d2b449e3cb4
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/usb/cdns-usb3.txt
>>> @@ -0,0 +1,30 @@
>>> +Binding for the Cadence USBSS-DRD controller
>>> +
>>> +Required properties:
>>> + - reg: Physical base address and size of the controller's register areas.
>>> + Controller has 3 different regions:
>>> + region 1 - HOST registers area
>>> + region 2 - DEVICE registers area
>>> + region 3 - OTG/DRD registers area
>>> + - reg-names - register memory area names:
>>> + "xhci" - for HOST registers space
>>> + "dev" - for DEVICE registers space
>>> + "otg" - for OTG/DRD registers space
>>> + - compatible: Should contain: "cdns,usb3-1.0.0" or "cdns,usb3-1.0.1"
>>> + - interrupts: Interrupts used by cdns3 controller.
>>
>> Since we are requesting 3 separate named interrupts in code we need to
>> mention them here.
>
> Hi Roger,
>
> Yes, I know, but this code is Reviewed-by: Rob Herring, so I thought to add
> this as separate patch after putting this driver into kernel.
>
Binding document should be updated as code changes.
> I assume that after making some change in this file I should remove statement
> Reviewed-by: Rob Herring <robh@...nel.org> from this patch to start reviving
> from the beginning.
Yes.
>
> What do you think about such dt-binding:
>
> Required properties:
> - reg: Physical base address and size of the controller's register areas.
> Controller has 3 different regions:
> region 1 - HOST registers area
> region 2 - DEVICE registers area
> region 3 - OTG/DRD registers area
Is it so that region 1 is always HOST?
offset 0 seems to be OTG though.
If it is implementation specific then you could get rid of numbering.
> - reg-names - register memory area names:
> "xhci" - for HOST registers space
> "dev" - for DEVICE registers space
> "otg" - for OTG/DRD registers space
> - compatible: Should contain:
> "cdns,usb3-1.0.0" - for 0x00024502 controller version
> "cdns,usb3-1.0.1" - for 0x00024509 controller version
> "cdns,usb3-1.0.2" - for 0x0002450C controller version
> "cdns,usb3-1.0.3" - for 0x0002450d controller version
>
> - interrupts: Interrupts used by cdns3 controller:
> "host" - interrupt used by XHCI driver.
> "peripheral" - interrupt used by device driver
> "otg" - interrupt used by DRD/OTG part of driver
>
> Optional properties:
> - maximum-speed : valid arguments are "super-speed", "high-speed" and
> "full-speed"; refer to usb/generic.txt
> - dr_mode: Should be one of "host", "peripheral" or "otg".
> - phys: reference to the USB PHY
need to add 'phy-names' since you request the PHY with name.
> - on-chip-buff-size : size of memory intended as internal memory for endpoints
> buffers expressed in KB
>
> Example:
> usb@...00000 {
> compatible = "cdns,usb3-1.0.1";
> interrupts = <USB_HOST_IRQ 7 IRQ_TYPE_LEVEL_HIGH>
coma missing.
> <USB_DEVICE_IRQ 7 IRQ_TYPE_LEVEL_HIGH>
here too.
> <USB_OTG_IRQ 8 IRQ_TYPE_LEVEL_HIGH>;
What is 7 and 8 ?
> interrupt-names = "host", "peripheral", "otg";
> reg = <0xf3000000 0x10000 /* memory area for HOST registers */
should end with >,
> 0xf3010000 0x10000 /* memory area for DEVICE registers */
here too
> 0xf3020000 0x10000>; /* memory area for OTG/DRD registers */
> reg-names = "xhci", "dev", "otg";
> };
Isn't otg at offset 0, xhci at offset 0x10000 and dev at offset 0x20000?
>
> Is this correct now ?
>
> Maybe I should add something additionally for phy ?
e.g.
phys = <&usb3_phy>;
phy-names = "cdns3,usbphy";
>
> Regards,
> Pawel
>
>
>>
>>> +
>>> +Optional properties:
>>> + - maximum-speed : valid arguments are "super-speed", "high-speed" and
>>> + "full-speed"; refer to usb/generic.txt
>>> + - dr_mode: Should be one of "host", "peripheral" or "otg".
>>> + - phys: reference to the USB PHY
>>> +
>>> +Example:
>>> + usb@...00000 {
>>> + compatible = "cdns,usb3-1.0.1";
>>> + interrupts = <USB_IRQ 7 IRQ_TYPE_LEVEL_HIGH>;
>>
>> This example won't work as code requests for 3 separate interrupts.
>>
>>> + reg = <0xf3000000 0x10000 /* memory area for HOST registers */
>>> + 0xf3010000 0x10000 /* memory area for DEVICE registers */
>>> + 0xf3020000 0x10000>; /* memory area for OTG/DRD registers */
>>> + reg-names = "xhci", "dev", "otg";
>>> + };
>>>
>>
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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