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([2600:8803:e7e4:500:677a:56dd:37eb:cf53]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-45766f16dfcsm10653282fac.7.2026.07.25.08.41.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 25 Jul 2026 08:41:32 -0700 (PDT) Message-ID: <023a4c95-4dd5-4405-bc73-2171a2292f29@baylibre.com> Date: Sat, 25 Jul 2026 10:41:30 -0500 Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: iio: dac: add support for mcp47a1 To: Joshua Crofts , Jonathan Cameron Cc: =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260721-mcp47a1-add-support-v1-0-da045a2567e3@gmail.com> <20260721-mcp47a1-add-support-v1-1-da045a2567e3@gmail.com> <20260725000439.5ad6f4d1@jic23-huawei> <20260725101208.06f60b70@systembl0wer> Content-Language: en-US From: David Lechner In-Reply-To: <20260725101208.06f60b70@systembl0wer> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/25/26 3:12 AM, Joshua Crofts wrote: > On Sat, 25 Jul 2026 00:04:51 +0100 > Jonathan Cameron wrote: > >> On Tue, 21 Jul 2026 20:24:38 +0200 >> Joshua Crofts wrote: >> >>> The Microchip MCP47A1 is a 6-bit volatile Digital-to-Analog converted >>> which communicates via I2C. >>> >>> Signed-off-by: Joshua Crofts >>> --- >>> .../bindings/iio/dac/microchip,mcp47a1.yaml | 56 ++++++++++++++++++++++ >>> MAINTAINERS | 6 +++ >>> 2 files changed, 62 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/iio/dac/microchip,mcp47a1.yaml b/Documentation/devicetree/bindings/iio/dac/microchip,mcp47a1.yaml >>> new file mode 100644 >>> index 000000000000..3322fca03b3a >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/iio/dac/microchip,mcp47a1.yaml >> >>> + >>> +examples: >>> + - | >>> + i2c { >>> + #address-cells = <1>; >>> + #size-cells = <0>; >>> + >>> + dac@2e { >>> + compatible = "microchip,mcp47a1"; >>> + reg = <0x2e>; >>> + vref-supply = <&vref_regulator>; >>> + vdd-supply = <&vdd_regulator>; >>> + }; >>> + >>> + dac@3e { >>> + compatible = "microchip,mcp47a1"; >> Hi Joshua, >> >> What is the advantage of the second example? I'd drop it. >> > > Hi Jonathan, > > Per the datasheet, the MCP47A1 can have two different I2C slave > addresses (0x2e and 0x3e), which allows two DACs to share the > same bus, something I thought would be good to illustrate in the > example. > I know we haven't done this much historically, but we could make that more obvious with this instead: reg: items: - enum: [0x2e, 0x3e] Then the bindings validator would actually check for a valid address.