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AJvYcCUSie/fciZ4HjVguFx3MvICtU1/VOgqNwHKvJVH66hsbKdUJ2XzqzMDQ1/8ovdwUf+4mPsbN2FrBJcc@vger.kernel.org X-Gm-Message-State: AOJu0Yzf7J0C+DHBh81EhKFiRGXSBMn3yOX0jCpAaw7Uf93MpE78cmAi HGohJbD/XSqeDPjOnok9K2mbySgj3W4u/7yjd+CyMY1TwcQ2JWgVHn7FZ+xFiFggZTQM5GyMjpc 0YfB28AZhAM1DRAqzgqfx1soqAKNZj/A= X-Gm-Gg: AY/fxX7rwkvfgjcuk5gwptBvGAvD6n+Vp7kFiIgxwsgLkb2RiHL4kI2K14meww0gKlz ykMbnueWIDPTPP7giHiuCQQS1xYQUaKvVIkxcq+qRtR0yFtPqEFHeB6cshQjRxMbOneP71QgXTD p5ZwcsC2f5EcBWpHKWi80F0v1e5pX+dx432gVski1mMgqODxuqi7PZy5swCMWeKhSdTNJwR31HZ Jvx7VPogshscqQLcjhwEGerzxy2CavlZBTWOJRhO2BX71fChP8jIHeSuPzir1ljSP5aj7hieFaJ Wowls74h0AtUHh2Yt1amzxXqw/g= X-Google-Smtp-Source: AGHT+IH/n6HDi9XTcEJRBWKGIz10PedulThRJ7x4uv71nP8DoCtZCymA1rkQJc0aCtpHQMfFqqVYkRiC9tDijK7BBRo= X-Received: by 2002:a05:6000:3111:b0:42b:3e20:f1b2 with SMTP id ffacd0b85a97d-42fb447ae67mr1628114f8f.4.1765537918745; Fri, 12 Dec 2025 03:11:58 -0800 (PST) Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20251014191121.368475-1-prabhakar.mahadev-lad.rj@bp.renesas.com> <20251014191121.368475-2-prabhakar.mahadev-lad.rj@bp.renesas.com> <20251016-dimmed-affidavit-90bae7e162aa@spud> <20251208-headgear-header-e17e162f0f52@spud> In-Reply-To: From: "Lad, Prabhakar" Date: Fri, 12 Dec 2025 11:11:30 +0000 X-Gm-Features: AQt7F2o0nVnOaR9-qVNKrHWb9R--8lodJV52Di2Ea3o66whanMp8URPFhYip6eE Message-ID: Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: renesas,r9a09g077: Document pin configuration properties To: Linus Walleij Cc: Conor Dooley , Geert Uytterhoeven , Linus Walleij , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Magnus Damm , linux-renesas-soc@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Biju Das , Fabrizio Castro , Lad Prabhakar Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Linus, Thank you for the review. On Thu, Dec 11, 2025 at 12:00=E2=80=AFAM Linus Walleij = wrote: > > Hi Lad, > > thanks for your patch! > > On Mon, Dec 8, 2025 at 7:01=E2=80=AFPM Conor Dooley wr= ote: > > On Mon, Dec 08, 2025 at 10:36:04AM +0000, Lad, Prabhakar wrote: > > > > > > > + slew-rate: > > > > > > + enum: [0, 1] > > > > > > > > > > What are the meanings of "0" and "1" for slew rate? Why isn't thi= s given > > > > I'll add a description for it (0 =3D slow, 1 =3D fast) and the same= values > > > > are programmed in the register to configure the slew rate. > > > > > > > > > as the actual rates? The docs surely give more detail than just "= slow" > > > > > and "fast". > > > > You mean to represent slew-rate in some sort of a unit? > > > > > > > Based on the comments from the HW team, there is no numerical > > > definition to represent slow/fast It only defines a relative > > > relationship. > > Then describe relative to what, so we can understand when to use > which setting? > I have made a query regarding this to the HW team. I'll respond as soon as I get any feedback. > > > The current value is determined by the load on the external circuit > > > and is not affected by the choice of drive strength. > (...) > > Remember, drive strength is the current that can be delivered through a > > pin, not how much it is delivering at a given point in time. > > This seems to be the core of the misunderstanding here. > > The setting defines the cap. How much current *can* be delivered. > > If the pin controller had a fuse that would bust if we delivered too > much current, this would be the grading of that fuse. > > It's the current where the driver stage(s) stop pushing in more > electrons, it's a very real thing and does not depend on what the > circuit look like. > > Pins usually have protected driver stages, so connecting an > amperemeter directly to ground and driving the line high would > actually give this value. > Agreed. Cheers, Prabhakar