Re: [PATCH v3 1/2] pinctrl: qcom: sc8180x: drop the use of tiles

[Shawn Guo <shawn.guo@xxxxxxxxxx>]

On Mon, Mar 08, 2021 at 07:08:00PM -0600, Bjorn Andersson wrote:
> On Thu 04 Mar 00:05 CST 2021, Shawn Guo wrote:
> 
> > To support both ACPI and DT, it makes more sense to not use tiles for
> > pinctrl-sc8180x driver, as ACPI table describes TLMM block with one
> > single memory resource.  Since DTS of SC8180X hasn't landed, there is
> > still chance to align DT description with ACPI.
> > 
> 
> I don't like the idea that we make up addresses to put in the DT to fit
> what was put in the DSDT. It is 3 different memory regions, with things
> in-between that Linux shouldn't touch.

This is not a new idea but something pinctrl-sdm845 has been doing for
years.  And IMHO, it's not a bad idea but a reasonable compromise.

> Isn't it possible to during ACPI probe take reg 0 and register the 3
> named regions instead?

It is possible.  But let's see what it takes.  We will need to have some
quirk handling in the ACPI core to detect TLMM device on Flex 5G
machine, and then override the memory resource registration for that
device.  Myself is not even convinced this is a good solution, not
mentioning whether ACPI maintainers will accept it.

Shawn