Re: obtaining a regulator from a phandle

* Stephen Warren wrote:

Thierry Reding wrote at Monday, March 05, 2012 8:22 AM:

quoted

I'm working on getting DT support for PCIe on Tegra working. The Tegra PCIe
controller needs a specific voltage supplied by a regulator on the board that
I use (Harmony-compatible), so what I did was add DT support for the PMU
(tps6586x) to provide the corresponding regulator:

...

quoted

Within the device node of the PCIe controller, I reference the ldo0 regulator
like so:

	pcie@80000000 {
		pex-clk-supply = <&ldo0_reg>;
	};

This all works well, except there seems to be no API to obtain a regulator
from the DT phandle.

regulator_get(pcie_dev, "pex-clk") should work.

Ah, I see. That would call regulator_dev_lookup(), which would call
of_get_regulator() which will lookup the pex-clk-supply property. I
will give that a shot.

Of course, the PCIe host on Tegra isn't yet a platform device, so would
have to be converted.

I've already converted that. I was going to send the patch when I've tested
that this works in a DT setup as well. So far I have only tested it on non-
DT Harmony.

Thierry