Re: [PATCH 2/2] serial: 8250: Add support for 8250/16550 as MFD function

From: Esben Haabendal
Date: Tue May 14 2019 - 04:02:36 EST

Lee Jones <lee.jones@xxxxxxxxxx> writes:

> On Tue, 07 May 2019, Esben Haabendal wrote:
>> Lee Jones <lee.jones@xxxxxxxxxx> writes:
>> > On Fri, 26 Apr 2019, Esben Haabendal wrote:
>> >
>> >> The serial8250-mfd driver is for adding 8250/16550 UART ports as functions
>> >> to an MFD driver.
>> >>
>> >> When calling mfd_add_device(), platform_data should be a pointer to a
>> >> struct plat_serial8250_port, with proper settings like .flags, .type,
>> >> .iotype, .regshift and .uartclk. Memory (or ioport) and IRQ should be
>> >> passed as cell resources.
>> >
>> > What? No, please!
>> >
>> > If you *must* create a whole driver just to be able to use
>> > platform_*() helpers (which I don't think you should), then please
>> > call it something else. This doesn't have anything to do with MFD.
>> True.
>> I really don't think it is a good idea to create a whole driver just to
>> be able to use platform_get_*() helpers. And if I am forced to do this,
>> because I am unable to convince Andy to improve the standard serial8250
>> driver to support that, it should be called MFD. The driver would be
> I assume you mean "shouldn't"?


>> generally usable for all usecases where platform_get_*() works.
>> I don't have any idea what to call such a driver. It really would just
>> be a fork of the current serial8250 driver, just allowing use of
>> platform_get_*(), supporting exactly the same hardware.
>> I am still hoping that we can find a way to improve serial8250 to be
>> usable in these cases.
> Me too.

Unfortunately, I don't seem to be able to convince Andy to accept
something like that.

I might have to do this out-of-tree :(