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Wed, 23 Sep 2026 13:29:13 -0700 (PDT) Received: from localhost ([188.216.77.92]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4886876c64dsm9373457f8f.21.2026.09.23.13.29.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2026 13:29:12 -0700 (PDT) Date: Wed, 23 Sep 2026 22:29:12 +0200 From: Lorenzo Bianconi To: Bjorn Helgaas Cc: Alex Elder , Bjorn Helgaas , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chaitanya Chundru , Linus Walleij , Bartosz Golaszewski , Bjorn Andersson , Konrad Dybcio , Michael Walle , Daniel Thompson , Sushrut Shree Trivedi , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-arm-msm@vger.kernel.org, Bartosz Golaszewski , Manivannan Sadhasivam Subject: Re: [PATCH v5 2/5] gpio: tc9563: Add support for the embedded GPIO controller Message-ID: References: <20260923200255.GA1934030@bhelgaas> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; 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charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > On Wed, Sep 23, 2026 at 01:59:49PM -0500, Alex Elder wrote: > > On 9/23/26 1:52 PM, Bjorn Helgaas wrote: > > > Patch [1/5] and a comment below mention 37 GPIOs, this mentions 35. > > > Are they supposed to match? Maybe 35 doesn't include the two reserved > > > ones? > >=20 > > They are numbered 0..36, and two of them (20 and 21) are reserved. >=20 > That's what I suspected. Any suggestions for rewording this to remove > the ambiguity? The current "providing 37 GPIO lines" and "implements > 35 GPIOs" just raises the question. what about something like: " Add a driver for the GPIO controller embedded in the Toshiba TC9563 PCIe switch (and the Qualcomm QPS615). The device implements 37 GPIOs using two register banks: three registers control the first 32 GPIOs and three more control GPIOs 32-36. GPIOs 20 and 21 are reserved while GPIOs 22-24, 27-28, 31, and 34 are input-only. " Regards, Lorenzo >=20 > > Of those, 10 (numbers 0-6, 12, 35, and 36) exposed outside the > > TC9564 chip itself. --oI9GUafU7NsbJqGc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCarQ2mAAKCRA6cBh0uS2t rD7LAPwKamp8rsgOUtzQVG4FHBs2cTDSeRJAVFRrINYQ0DBrqAD/TBi0DepNYAyJ IFRIKZYHbaS4VFQf1hshwPrtok5YggY= =Sv9q -----END PGP SIGNATURE----- --oI9GUafU7NsbJqGc--