[PATCH v2 1/4] ARM: dts: sun8i: r40: add /omit-if-no-ref/ to pinmux nodes for UARTs 0&3

[Maxime Ripard]

On Mon, Mar 22, 2021 at 04:18:04PM +0000, Andre Przywara wrote:
> On Mon, 22 Mar 2021 13:55:35 +0300
> Ivan Uvarov <i.uvarov at cognitivepilot.com> wrote:
> 
> Hi,
> 
> > This patch adds the /omit-if-no-ref/ keyword to the pio nodes for
> > UART0 and UART3 pins of the R40 SoC, which would reduce the fdt size on
> > boards which do not use these UARTs.
> 
> But what boards are those? It seems like all boards use uart3-pg and
> the two existing boards use UART0.
> 
> I think the idea is to use omit-if-no-ref on some rarely used nodes, so
> if there is only a single user, for instance. Your next patch is a good
> example.

There's no real cost associated to it though, so it's just easier to
flag all the nodes and let the compiler figure out if it should evict
them or not.

Maxime
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