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18 Aug 2026 15:13:39 +0000 Date: Tue, 18 Aug 2026 16:14:40 +0100 From: Nuno =?utf-8?B?U8Oh?= To: David Lechner Cc: Jonathan Santos , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, michael.hennerich@analog.com, broonie@kernel.org, jonath4nns@gmail.com, marcelo.schmitt1@gmail.com, andriy.shevchenko@intel.com Subject: Re: [PATCH v3 1/6] dt-bindings: iio: adc: ad7768-1: Document multidevice support Message-ID: References: <9841fd2e-434f-48f3-90c1-d62718d6d4d2@baylibre.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9841fd2e-434f-48f3-90c1-d62718d6d4d2@baylibre.com> X-ClientProxiedBy: MR1P264CA0149.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501:54::15) To SJ0PR03MB5469.namprd03.prod.outlook.com (2603:10b6:a03:28a::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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10:02:50AM -0500, David Lechner wrote: > On 8/17/26 6:32 PM, Jonathan Santos wrote: > > The AD7768-1 family supports aggregating up to four devices on a single > > SPI controller, with each device occupying a dedicated CS line and a > > single data lane. > > > > Extend the `reg` property to accept up to 4 entries (one per device). > > > > Add `spi-rx-bus-width` property to declare the per-device lane count. > > Since each lane is bound to one CS, the number of entries must match > > `reg`. Make it required when `reg` has more than one entry. > > > I don't see why we should have to require the spi-rx-bus-width property. > It seems logical that if it is not present, then we would assume one > lane per CS. This is already how bindings work. > > For example, adi,ad4080 and ge,achc have multiple CS lines and don't > require any bus width properties. Hmm that's my default then! I was the one requesting it. Basically because of: https://elixir.bootlin.com/linux/v7.2/source/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml#L76 So I thought that $refing spi-peripheral-props.yaml and leaving the default value would make dtbs_check to fail if one used spi-rx-bus-width = <1>, <1>, <1>, <1>; in DT. Won't it fail? And if we don't give the property I believe we'll have: https://elixir.bootlin.com/linux/v7.2/source/drivers/spi/spi.c#L2509 And given these series assumption of spi->num_rx_lanes == number of devices (which I don't agree btw), I thought we would need to make spi-rx-bus-width explicit in our bindings! I still think but I might be wrong and I'm by no means an expert on dt bindings schemas work :) - Nuno Sá >