linux-kernel - Re: [PATCH v3 3/4] gpio: imx-rpmsg: add imx-rpmsg GPIO driver

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Message-ID: <08a8e0d6-f486-40bd-a2f1-43e33ccde1d2@lunn.ch>
Date: Mon, 13 Oct 2025 18:55:39 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Shenwei Wang <shenwei.wang@....com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Peng Fan <peng.fan@....com>,
	"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v3 3/4] gpio: imx-rpmsg: add imx-rpmsg GPIO driver

> > Notice how ENOPNOTSUPP can be 45, 122, 223, or 95. Returning EL2NSYNC or
> > EDQUOT to user space is going to cause confusion...
> >
> 

> I think we should just follow the definitions in
> include/uapi/asm-generic/errno.h, right?

No.

Try a make for mips, and look at includes you end up with. You will
find it goes something like:

# 1 "./arch/mips/include/asm/errno.h" 1
# 11 "./arch/mips/include/asm/errno.h"
# 1 "./arch/mips/include/uapi/asm/errno.h" 1
# 16 "./arch/mips/include/uapi/asm/errno.h"
# 1 "./include/uapi/asm-generic/errno-base.h" 1
# 17 "./arch/mips/include/uapi/asm/errno.h" 2

and this results in

#define EOPNOTSUPP      122     /* Operation not supported on transport endpoint */

not what you get from asm-generic/errno.h:

#define	EOPNOTSUPP	95	/* Operation not supported on transport endpoint */

	Andrew