Re: [PATCH 0/2] pinctrl: aspeed: Make AST2700 SoC1 JTAG master TRST optional

Linus Walleij <[email protected]> Tue, 30 Jun 2026 12:52:49 +0100

Newsgroups	org.ozlabs.lists.openbmc,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-gpio,org.kernel.vger.linux-kernel,org.ozlabs.lists.linux-aspeed
Message-ID	<CAD++jLm3-5BP+1E_DLTZvEPd1ugMZrXiOjM+Gqnn9Ri+uNWuPw@mail.gmail.com>

On Tue, Jun 16, 2026 at 4:30 AM Billy Tsai <[email protected]> wrote:

> The JTAGM1 pin group of the AST2700 SoC1 includes ball D12, which
> carries the TRST signal. TRST is an optional signal for a JTAG master:
> designs that do not wire it may need the D12 ball for other functions,
> but with TRST embedded in the group they cannot use the JTAG master at
> all.
>
> Split D12 into a new JTAGM1TRST group under the existing JTAGM1
> function, so TRST is only muxed when a board explicitly requests it.
> Patch 1 adds the new group to the device tree binding and patch 2
> splits the group in the driver.
>
> Note that this changes the meaning of the existing JTAGM1 group: boards
> that do use TRST now need to select both the JTAGM1 and JTAGM1TRST
> groups.
>
> Signed-off-by: Billy Tsai <[email protected]>

Patches applied!

Yours,
Linus Walleij