Re: [PATCH] serial: 8250: Add support for using platform_device resources

"Enrico Weigelt, metux IT consult" [off-list ref] writes:

On 30.04.19 16:04, Esben Haabendal wrote:

quoted

Allow getting memory resource (mapbase or iobase) as well as irq from
platform_device resources.

The UPF_DEV_RESOURCES flag must be set for devices where platform_device
resources are to be used.  When not set, driver behaves as before.

This allows use of the serial8250 driver together with devices with
resources added by platform_device_add_resources(), such as mfd child
devices added with mfd_add_devices().

I like the idea (actually, quite the direction I'd like to go), but
unfortunately it's more compilicated than that.

Some drivers don't use these fields, eg. 8250 determines the mapsize
based on several factors, at the time of the mapping is done. That's
one of the things my patches shall clean up.

Could you take a quick look at my patch again.  The patch only changes
the probe method in the serial8250_isa_driver in 8250_core.c file.

So other drivers are not affected by this change.

And with the addition of the new UPF_DEV_RESOURCES flag, no existing
platforms should be affected either.

The patch merely makes it possible to start using plain "serial8250"
driver (serial8250_isa_driver) with standard platform resources, fx. as
implemented by mfd-core.

/Esben