linux-kernel - Re: [PATCH] MEDIATEK: serial: 8250

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Message-ID: <434e34f05bb5f87b59402811012e3a2f56f2182e.camel@mediatek.com>
Date: Wed, 21 Jan 2026 06:23:43 +0000
From: Zhiyong Tao (陶志勇) <Zhiyong.Tao@...iatek.com>
To: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC: Project_Global_Digits_Upstream_Group
	<Project_Global_Digits_Upstream_Group@...iatek.com>, "fred2599@...il.com"
	<fred2599@...il.com>, Yenchia Chen (陳彥嘉)
	<Yenchia.Chen@...iatek.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Vasanth Reddy
	<Vasanth.Reddy@...iatek.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Liguo Zhang (张立国)
	<Liguo.Zhang@...iatek.com>, "jirislaby@...nel.org" <jirislaby@...nel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] MEDIATEK: serial: 8250_mtk: Add ACPI support

On Tue, 2026-01-06 at 11:02 +0100, Greg KH wrote:
> On Mon, Jan 05, 2026 at 10:39:55AM +0800, Zhiyong Tao wrote:
> > From: "Zhiyong.Tao" <zhiyong.tao@...iatek.com>
> > 
> > Add ACPI support to 8250_mtk driver. This makes it possible to
> > use UART on ARM-based desktops with EDK2 UEFI firmware.
> > 
> > Signed-off-by: Yenchia Chen <yenchia.chen@...iatek.com>
> > Signed-off-by: Zhiyong.Tao <zhiyong.tao@...iatek.com>
> > ---
> >  drivers/tty/serial/8250/8250_mtk.c | 23 +++++++++++++++++++----
> >  1 file changed, 19 insertions(+), 4 deletions(-)
> 
> This is a resend of the previous version, right?  Or did something
> change?
> 
> confused,
> 
> greg k-h

==> Hi Greg,
Yes, previously Yenchia Chen helped to send out a version. Currently,
this solution is specifically for the GB10 project and was made to
support Windows ACPI settings. 

In actual application scenarios, the apdma clk will not be turned off
in normal mode. It is only turned off in the SSPM microprocessor after
entering standby, and when resuming, the apdma clk is re-enabled by
SSPM.

As for other Linux projects, apdma still uses the DTS node.

Thanks