Re: [PATCH 11/11] ARM: tegra: pcie: Add device tree support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

On 03/08/2012 11:31 PM, Thierry Reding wrote:
> * Stephen Warren wrote:
>> On 03/08/2012 07:51 AM, Thierry Reding wrote:
>>> This commit adds support for instantiating the Tegra PCIe controller
>>> from a device tree.
>>> Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
>>> diff --git a/Documentation/devicetree/bindings/pci/tegra-pcie.txt b/Documentation/devicetree/bindings/pci/tegra-pcie.txt
>>> +NVIDIA Tegra PCIe controller
>>> +
>>> +Required properties:
>>> +- compatible: "nvidia,tegra20-pcie"
>>> +- reg: physical base address and length of the controller's registers
>>> +- interrupts: the interrupt outputs of the controller
>>> +
>>> +Optional properties:
>>> +- pex-clk-supply: supply voltage for internal reference clock
>>> +- vdd-supply: power supply for controller (1.05V)
>> Mark, Liam,
>> Should those *-supply properties really be optional? I got the
>> impression talking to Mark in a different thread that all regulators
>> should exist, although their implementation may be via a fixed
>> regulator, with no GPIO, as determined by the board design.
> If I read the TrimSlice code correctly, there is no regulator setup required
> to make PCIe work there presumably because they hardwire the proper voltages.

Yes. I believe that's exactly what the fixed regulator is for.

> On the other hand, maybe a better solution in this case would be to use the
> dummy regulator in those cases.

Mark indicated dummy regulators weren't the preferred mechanism:
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at

[ARM Kernel]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Photo]     [Yosemite News]    [Yosemite Photos]     [Free Online Dating]     [Linux Kernel]     [Linux SCSI]     [XFree86]

Add to Google Powered by Linux