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([2001:818:ea8e:7f00:2575:914:eedd:620e]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aba53231f5bsm339050466b.7.2025.02.14.05.17.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Feb 2025 05:17:35 -0800 (PST) Message-ID: <880631da17a6d8ed4afe5a8c453fd4f7d0e4fca5.camel@gmail.com> Subject: Re: [PATCH v2 2/2] gpio: gpio-adg1414: New driver From: Nuno =?ISO-8859-1?Q?S=E1?= To: Linus Walleij , Kim Seer Paller Cc: Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 14 Feb 2025 13:17:38 +0000 In-Reply-To: References: <20250213-for_upstream-v2-0-ec4eff3b3cd5@analog.com> <20250213-for_upstream-v2-2-ec4eff3b3cd5@analog.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi Linus, On Fri, 2025-02-14 at 00:25 +0100, Linus Walleij wrote: > Hi Kim, >=20 > thanks for your patch! >=20 > On Thu, Feb 13, 2025 at 2:17=E2=80=AFPM Kim Seer Paller > wrote: >=20 > > The ADG1414 is a 9.5 =CE=A9 RON =C2=B115 V/+12 V/=C2=B15 V iCMOS Serial= ly-Controlled > > Octal SPST Switches > >=20 > > Signed-off-by: Kim Seer Paller >=20 > OK so I looked at the data sheet and it looks like this: >=20 > A=C2=A0 o-------/ --------o B >=20 > It'a a switch. >=20 > Why is this switch a "gpio", other than that it is convenient > to use the GPIO abstraction to control it? >=20 > GPIO is usually devices that can drive a line high or low. > This is very far from that. This could switch some analog > line or whatever, right? I would say so yes but Kim should know better... >=20 > Now, the kernel does not have switch subsystem I think, > so this is something like a special case, so we might be > compelled to make an exception, if the users will all be in Exactly, since we could not find anything, the best fit seemed like the gpi= o subsystem. I was the one suggesting it since a new subsystem for a simple d= evice like this looked excessive. If we had more devices that would fit such a cl= ass of devices, maybe it would make more sense to start thinking on such a subsystem? > say userspace and make use of this switch for factory lines > or similar. Kim should know better again (about usecases) but I would also assume this = is for userspace use. Thanks! - Nuno S=C3=A1