[PATCH u-boot v2019.04-aspeed-openbmc] pinctrl: ast2400: add support for TXD3/RXD3 pins

[Ryan Chen]

Hello,

> -----Original Message-----
> From: Zev Weiss <zev at bewilderbeest.net>
> Sent: Tuesday, December 14, 2021 9:33 AM
> To: Ryan Chen <ryan_chen at aspeedtech.com>
> Cc: openbmc at lists.ozlabs.org; Joel Stanley <joel at jms.id.au>; ChiaWei Wang
> <chiawei_wang at aspeedtech.com>
> Subject: Re: [PATCH u-boot v2019.04-aspeed-openbmc] pinctrl: ast2400: add
> support for TXD3/RXD3 pins
> 
> On Mon, Dec 13, 2021 at 05:22:52PM PST, Ryan Chen wrote:
> >Hello,
> >	You may need claim for function group for link, not for pin link.
> >	Ex.
> >	static struct aspeed_sig_desc uart3_link[] = {
> >		{ 0x80, BIT(22), 0},
> >		{ 0x80, BIT(23), 0},
> >	}
> >
> >	ast2400_groups[] = {
> >	{ "UART3", 2, uart3_link },
> >Ryan
> 
> Hi Ryan,
> 
> That possibility occurred to me, but the existing function/group names in
> arch/arm/dts/ast2400.dtsi (lines 1130-1133 and 1375-1378) made me think
> they should be separate.  
This device tree is copied from Linux kernel.

> I'm certainly not an expert on pinctrl stuff
> though...is there some other existing logic or mechanism to link a "UART3" to
> the separate "TXD3" and "RXD3" in the device tree?
There is no separate in u-boot device tree.
May I know why you need separate?
> 
> 
> Zev