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Mon, 29 Jun 2026 14:20:13 -0700 (PDT) Sender: Guenter Roeck Date: Mon, 29 Jun 2026 14:20:12 -0700 From: Guenter Roeck To: Conor Dooley Cc: linux-hwmon@vger.kernel.org, Lars Randers , Conor Dooley , Jonathan Corbet , Shuah Khan , Daire McNamara , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Valentina.FernandezAlanis@microchip.com Subject: Re: [PATCH v4] hwmon: add a driver for the temp/voltage sensor on PolarFire SoC Message-ID: <5f9ff7eb-44d1-4f74-8368-b08298f67fc4@roeck-us.net> References: <20260629-wriggle-headscarf-c85a4070dddb@spud> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260629-wriggle-headscarf-c85a4070dddb@spud> On Mon, Jun 29, 2026 at 10:30:59AM +0100, Conor Dooley wrote: > From: Lars Randers > > Add a driver for the temperature and voltage sensors on PolarFire SoC. > The temperature reports how hot the die is, and the voltages are the > SoC's 1.05, 1.8 and 2.5 volt rails respectively. > > The hardware supports alarms in theory, but there is an erratum that > prevents clearing them once triggered, so no support is added for them. > > The hardware measures voltage with 16 bits, of which 1 is a sign bit and > the remainder holds the voltage as a fixed point integer value. It's > improbable that the hardware will work if the voltages are negative, so > the driver ignores the sign bits. > > There's no dt support etc here because this is the child of a simple-mfd > syscon. > > Signed-off-by: Lars Randers > Co-developed-by: Conor Dooley > Signed-off-by: Conor Dooley Applied. Thanks, Guenter