Re: [PATCH] efikamx: reintroduce Genesi Efika MX Smarttop via device tree

[Matt Sealey <matt@xxxxxxxxxxxxxx>]

On Thu, Aug 9, 2012 at 8:41 PM, Shawn Guo <shawn.guo@xxxxxxxxxx> wrote:
> On Thu, Aug 09, 2012 at 09:29:39AM -0500, Matt Sealey wrote:
>> The reason the new kernel depends on the new U-Boot is we're trying to
>> do all pinmux configuration in U-Boot (and we do in-house, and it
>> works). No pinctrl stuff in the kernel or device tree is required at
>> this point. The Old Kernel will remux a few things redundantly or
>> change drive strengths or whatever or add hysteresis to the UART port
>> which is not board-burning but is not really necessary, but it will
>> work. The new kernel will just be able to do what it does out of the
>> box, which is how it should be (hence why I object to adding pinctrl
>> setup...)
>
> Then I will have to refuse to accept your patch, because I'm working on
> a series to remove pinctrl_provide_dummies() from imx51_dt_init().

Requiring it breaks the entire concept of the device tree to describe running
hardware. It is not a configuration script. pinctrl should be optional
- built in
always, but not necessary to turn a board on if it's already configured.

What would happen if a board were designed that only used the default ALT
settings on i.MX53 or so? You'd have to redefine every default IOMUX pad
just to get it to boot. That's intolerable.

-- 
Matt Sealey <matt@xxxxxxxxxxxxxx>
Product Development Analyst, Genesi USA, Inc.

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