linux-kernel - Re: [PATCH V7 4/9] mfd: Add binding document for NVIDIA Tegra XUSB

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Date:	Wed, 29 Apr 2015 10:02:35 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...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>,
	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>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH V7 4/9] mfd: Add binding document for NVIDIA Tegra XUSB

Lee,

On Wed, Apr 29, 2015 at 2:25 AM, Lee Jones <lee.jones@...aro.org> wrote:
> On Mon, 27 Apr 2015, Andrew Bresticker wrote:
>
>> Add a binding document for the XUSB host complex on NVIDIA Tegra124
>> and later SoCs.  The XUSB host complex includes a mailbox for
>> communication with the XUSB micro-controller and an xHCI host-controller.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Pawel Moll <pawel.moll@....com>
>> Cc: Mark Rutland <mark.rutland@....com>
>> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
>> Cc: Kumar Gala <galak@...eaurora.org>
>> Cc: Samuel Ortiz <sameo@...ux.intel.com>
>> Cc: Lee Jones <lee.jones@...aro.org>
>> ---
>> New for v7.
>> ---
>>  .../bindings/mfd/nvidia,tegra124-xusb.txt          | 46 ++++++++++++++++++++++
>>  1 file changed, 46 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt b/Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt
>> new file mode 100644
>> index 0000000..6a46680
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt
>> @@ -0,0 +1,46 @@
>> +NVIDIA Tegra XUSB host copmlex
>> +==============================
>> +
>> +The XUSB host complex on Tegra124 and later SoCs contains an xHCI host
>> +controller and a mailbox for communication with the XUSB micro-controller.
>> +
>> +Required properties:
>> +--------------------
>> + - compatible: For Tegra124, must contain "nvidia,tegra124-xusb".
>> +   Otherwise, must contain '"nvidia,<chip>-xusb", "nvidia,tegra124-xusb"'
>> +   where <chip> is tegra132.
>
> Okay.  Why?

Why what?  This is the convention used for Tegra bindings and is also
documented in Documentation/devicetree/bindings/submitting-patches.txt.
See nvidia,tegra114-spi.txt and nvidia,tegra20-i2c.txt for other
examples of this.

>> + - reg: Must contain register base and length for each register set listed
>> +   in reg-names.
>
> You've mentioned 2 of the cells, what about the remaining 2?

The example given was for Tegra124, where there are two address cells
and two size cells.

>> + - reg-names: Must include the following entries:
>> +   - xhci
>> +   - fpci
>> +   - ipfs
>> + - interrupts: Must contain an interrupt for each entry in interrupt-names.
>> + - interrupt-names: Must include the following entries:
>> +   - host
>> +   - smi
>> +   - pme
>> +
>> +Example:
>> +--------
>> +     usb@0,70090000 {
>> +             compatible = "nvidia,tegra124-xusb";
>> +             reg = <0x0 0x70090000 0x0 0x8000>,
>> +                   <0x0 0x70098000 0x0 0x1000>,
>> +                   <0x0 0x70099000 0x0 0x1000>;
>> +             reg-names = "xhci", "fpci", "ipfs";
>> +             interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>,
>> +                          <GIC_SPI 40 IRQ_TYPE_LEVEL_HGIH>,
>> +                          <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
>> +             interrupt-names = "host", "smi", "pme";
>
> Are these resources used by both children?

Only the FPCI register set is shared.

> If not, place them into the children and ioremap() them from the
> associated child drivers.

Ok.

-Andrew
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