[U-Boot] [PATCH v2 3/6] tegra: dts: Sync tegra20 device tree files with Linux

[Stephen Warren]

On 05/08/2016 04:55 PM, Simon Glass wrote:
> Sync everything except the display panel, which will come in a future patch.
> One USB port is left disabled since we don't want to support it in U-Boot.

I'd rather be a bit more careful here, and only import the DT nodes 
directly related to display output.

This change brings in a slew of other nodes that aren't used by U-Boot 
(something we've historically explicitly avoided) such as pinctrl, 
audio, Tegra KBC, I2C mux, & regulators.

It also doesn't sync the /aliases node with the kernel (e.g. Seaboard 
I2C, and I think USB for all boards), and at least Harmony's USB nodes 
don't seem to match what's in the kernel so I'm not sure where the DT 
content came from, e.g. consider usb at c5004000's nvidia,phy-reset-gpio 
used an integer rather than GPIO_ACTIVE_LOW, which is present in at 
least the most recent kernel release (v4.5).

Splitting this up a bit or limiting it to just display-related nodes 
would make it easier to debug any issues that crop up with the sync. 
Also, have we made an explicit decision to change the policy of only 
including DT nodes that U-Boot actually uses, rather than simply copying 
the entire kernel DT into U-Boot? I'm pretty sure that some board(s) 
have deliberate differences in areas other than display, e.g. since 
U-Boot doesn't (or at least didn't) support pinctrl-based I2C muxed 
which are used on some Tegra20 boards in the kernel at least, and hence 
U-Boot likely either disabled those I2C ports or picked an explicit 
pinmux configuration to hard-code to.