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[86.49.244.181]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-495653698bcsm79422215e9.2.2026.07.21.11.37.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jul 2026 11:37:19 -0700 (PDT) Date: Tue, 21 Jul 2026 20:37:16 +0200 From: Joshua Crofts To: sashiko-bot@kernel.org Cc: sashiko-reviews@lists.linux.dev, robh@kernel.org, devicetree@vger.kernel.org, conor+dt@kernel.org Subject: Re: [PATCH 1/2] dt-bindings: iio: dac: add support for mcp47a1 Message-ID: <20260721203716.0fc5313c@systembl0wer> In-Reply-To: <20260721183358.67E151F00A3D@smtp.kernel.org> References: <20260721-mcp47a1-add-support-v1-0-da045a2567e3@gmail.com> <20260721-mcp47a1-add-support-v1-1-da045a2567e3@gmail.com> <20260721183358.67E151F00A3D@smtp.kernel.org> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 21 Jul 2026 18:33:58 +0000 sashiko-bot@kernel.org wrote: Clarifying Sashiko's comment: > [Severity: Medium] > Does the MCP47A1 actually have a dedicated VREF pin? Standard Microchip I2C > DACs in this class (such as the 6-pin MCP4725) typically use VDD as their > voltage reference. > > If there is no physical VREF pin on this hardware, requiring vref-supply > here forces device tree authors to define dummy regulators in their > device trees just to pass schema validation. Yes, the MCP47A1 does have a physical VREF pin, as seen in the block diagram: https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/25154A.pdf -- Kind regards, Joshua Crofts