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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uCMPQ-0000000Ctnk-32kT; Tue, 06 May 2025 17:48:48 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uCIve-0000000CFYW-2Gry for linux-arm-kernel@lists.infradead.org; Tue, 06 May 2025 14:05:52 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 436D644A69; Tue, 6 May 2025 14:05:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D45F9C4CEE4; Tue, 6 May 2025 14:05:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746540350; bh=rtGooarvZfFQ6BrtD0+1cwijdv62pjdrrNWljVpj0xE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=CavGFfBwe9eA/J6fTn0Tc/ljif6AN4LkaacNCnZkVSq3FCx6ez0zoz9ribQZvba8o sTLNzMNCwV6R3Op/hF1n1jrxZ6FW389LOKmY493/xvA1/WTja0I8V9cAvbnfWJfYd/ 9r6bmUe7lB2DppQDa75YmhaS039cyMhITVsRAgXw4I6d/YJab93M2PSaFxK25Bgy0p hnTQipJBobZ/g5oTm2MXUyDxplCbpRdEF3ShJh4IDv5qAob3BHS5IUCDN5RFue6Pm9 0AHIccSZGSkMrtjE1djQbal3DwNW7zwzHbMZAx6twgSKK5AhwP+pE+nLfs8tEq70TE P6LzEBV07MilQ== Message-ID: <959b56f0-ff63-485b-86eb-96ae32bdeb88@kernel.org> Date: Tue, 6 May 2025 16:05:46 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/6] dt-bindings: mfd: add bindings for QIXIS CPLD To: Ioana Ciornei Cc: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20250430153634.2971736-1-ioana.ciornei@nxp.com> <20250430153634.2971736-2-ioana.ciornei@nxp.com> <20250502-meticulous-bulky-wildebeest-c1a8b6@kuoka> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250506_070550_626324_935DFE14 X-CRM114-Status: GOOD ( 23.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 06/05/2025 15:57, Ioana Ciornei wrote: > On Fri, May 02, 2025 at 09:01:59AM +0200, Krzysztof Kozlowski wrote: >> On Wed, Apr 30, 2025 at 06:36:29PM GMT, Ioana Ciornei wrote: >>> This adds device tree bindings for the board management controller - >>> QIXIS CPLD - found on some Layerscape based boards such as LX2160A-RDB, >>> LX2160AQDS, LS1028AQDS etc. >>> >>> Signed-off-by: Ioana Ciornei >>> --- >>> .../bindings/mfd/fsl,qixis-i2c.yaml | 65 +++++++++++++++++++ >>> 1 file changed, 65 insertions(+) >>> create mode 100644 Documentation/devicetree/bindings/mfd/fsl,qixis-i2c.yaml >>> >>> diff --git a/Documentation/devicetree/bindings/mfd/fsl,qixis-i2c.yaml b/Documentation/devicetree/bindings/mfd/fsl,qixis-i2c.yaml >>> new file mode 100644 >>> index 000000000000..562878050916 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/mfd/fsl,qixis-i2c.yaml >> >> Filename matching compatible. > > How to choose one if there are multiple compatible strings? The fallback or the oldest or the lowest number or whichever you prefer as a base. > >> >>> @@ -0,0 +1,65 @@ >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >>> +%YAML 1.2 >>> +--- >>> +$id: http://devicetree.org/schemas/mfd/fsl,qixis-i2c.yaml >>> +$schema: http://devicetree.org/meta-schemas/core.yaml >>> + >>> +title: NXP's QIXIS CPLD board management controller >>> + >>> +maintainers: >>> + - Ioana Ciornei >>> + >>> +description: | >>> + The board management controller found on some Layerscape boards contains >>> + different IP blocks like GPIO controllers, interrupt controllers, reg-muxes >>> + etc. >>> + >>> +properties: >>> + compatible: >>> + enum: >>> + - fsl,lx2160a-qds-qixis-i2c >>> + - fsl,lx2162a-qds-qixis-i2c >>> + - fsl,ls1028a-qds-qixis-i2c >> >> Keep alphabetical order. >> >> What is actual device name? I2C? Is this an I2C controller or device? I assume you will then drop the redundant part. >> >>> + >>> + reg: >>> + description: >>> + I2C device address. >> >> This says device, so i2c in compatible is wrong. >> >> Anyway drop description, redundant. > > Ok, will drop. > >> >> >>> + maxItems: 1 >>> + >>> + "#address-cells": >>> + const: 1 >> >> Why? >> >>> + >>> + "#size-cells": >>> + const: 0 >> >> Why? Drop cells. >> > > See below. > >>> + >>> + mux-controller: >>> + $ref: /schemas/mux/reg-mux.yaml# >>> + >>> +required: >>> + - "#address-cells" >>> + - "#size-cells" >>> + - compatible >>> + - reg >> >> Keep same order as in properties > > Ok. > >> >>> + >>> +additionalProperties: false >>> + >>> +examples: >>> + - | >>> + i2c { >>> + #address-cells = <1>; >>> + #size-cells = <0>; >>> + >>> + qixis@66 { >> >> Node names should be generic. See also an explanation and list of >> examples (not exhaustive) in DT specification: >> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation > > In this case, an accepted node name is 'cpld'? If this is CPLD then yes. > >> >>> + compatible = "fsl,lx2160a-qds-qixis-i2c"; >>> + reg = <0x66>; >>> + #address-cells = <1>; >>> + #size-cells = <0>; >> >> So were do you use address/size cells? >> > > For example, fsl-ls1028a-qds.dts looks like this: > > fpga@66 { > compatible = "fsl,ls1028a-qds-qixis-i2c"; > reg = <0x66>; > #address-cells = <1>; > #size-cells = <0>; > > mux: mux-controller@54 { > compatible = "reg-mux"; > reg = <0x54>; > #mux-control-cells = <1>; > mux-reg-masks = <0x54 0xf0>; /* 0: reg 0x54, bits 7:4 */ > }; > }; > > Also, some boards have in their qixis CPLD gpio controllers and I am > planning to add them as the next step. And if you tested that DTS you would see that binding does not work well... so my arguments stay valid - these properties in current binding make no sense. However binding is just wrong, so maybe these properties make sense after fixing the binding but then in both cases: current stage is not correct. > > Ioana Best regards, Krzysztof