linux-kernel - Re: [PATCH V3 3/4] ARM64 LPC: support serial based on low-pin-count

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Message-ID: <4518414.hTLWuvFlBl@wuerfel>
Date:   Wed, 21 Sep 2016 21:29:22 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     zhichang <zhichang.yuan02@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        "zhichang.yuan" <yuanzhichang@...ilicon.com>,
        devicetree@...r.kernel.org, lorenzo.pieralisi@....com,
        gabriele.paoloni@...wei.com, minyard@....org,
        gregkh@...uxfoundation.org, benh@...nel.crashing.org,
        john.garry@...wei.com, will.deacon@....com,
        linux-kernel@...r.kernel.org, xuwei5@...ilicon.com,
        linuxarm@...wei.com, linux-serial@...r.kernel.org,
        linux-pci@...r.kernel.org, zourongrong@...il.com,
        liviu.dudau@....com, kantyzc@....com
Subject: Re: [PATCH V3 3/4] ARM64 LPC: support serial based on low-pin-count

On Wednesday, September 21, 2016 6:12:28 PM CEST zhichang wrote:
> On 2016年09月15日 05:33, Arnd Bergmann wrote:
> > On Wednesday, September 14, 2016 11:04:33 PM CEST zhichang.yuan wrote:
> >> The 8250_hisi_lpc.c support both ACPI and dts similar to 8250_dw :
> >>
> >> +static struct platform_driver hs_lpc8250_driver = {
> >> +       .driver = {
> >> +               .name           = "hisi-lpc-uart",
> >> +               .of_match_table = hs8250_of_match,
> >> +               .acpi_match_table = ACPI_PTR(hs8250_acpi_match),
> >>
> >> So, I am a little confused why we need to support dts in 8250_of.c and support ACPI in another
> >> driver file.
> >>
> > 
> > After looking again, I'm pretty sure that drivers/tty/serial/8250/8250_pnp.c
> > will handle the ACPI case without modifications, you just need to adapt
> > the 8250_of driver to handle IORESOURCE_IO ports. This will be required
> > anyway with the next version once the LPC bridge is on the PCI bus.
> > 
> 
> Yes. You are right.
> 
> When the indirectIO patch is accepted, no much changes needed in these two file to support LPC UART.
> 
> BTW, what is your target to change these two files to support LPC uart?
> Do you think we don't need to add many new c files??

I think by modifying 8250_of.c, you should be able to make any UART on
some LPC bus work, regardless of what controller is used.

The ACPI version (8250_pnp.c) shouldn't need any changes at all if I
read that correctly.

	Arnd