From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CB78BC021B8 for ; Wed, 26 Feb 2025 08:05:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=DB9NUBzNxrQRJR6X2gIEo+OnGT6fA/8OgK+UjUd/k2g=; b=AiuOb2pYIeRstdKYht0RuP7EHq JpuKx6lJInmd8yxamxjBG8HgknonOJRN06mEtKezxPT/wk+1dFExxVYvrLaK0EOFfbOlFQ6JNF4Ed U5MUWjJI+/oYOOdPCrpHT40QU8q8TGseJOFVyAg9I175U1TRbDVDyQqDyIUyX2PSNsyZuugA1mrUI 7zHqd21v9cPA5xMV+WJ46odDuQHBmvwuIOt0xrLeaWndfPU+M+QwMtBhIOsTrTK1V6NsMBVae/fm0 nkGkWUVtK0oHCQjv654NY21G0aw5mlVOc56uyIc5qh57ezqTVAnGPLaC43ewDPaNCxP019HN6E7cQ DGRT0pew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tnCQ2-00000002oBM-4AgW; Wed, 26 Feb 2025 08:05:26 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tnCCW-00000002kWw-1AHF for linux-arm-kernel@lists.infradead.org; Wed, 26 Feb 2025 07:51:29 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id C19385C3F42; Wed, 26 Feb 2025 07:50:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07280C4CEE2; Wed, 26 Feb 2025 07:51:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740556287; bh=9eFHXpGsf3ECjgV3E67TSiU05/e2Y8rXQci+VACk4XY=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=WlndDT8raEr4NnEzyhjKw9QpCmbUwYWGO60bPAtCHgbIIGRCOC5v095KILS2MqmgV Wu+tLLUHnZfeMzPnnEHduboaYP8tSAfZUNMMQmFzIr1525nsoN/lJ2u6/SWIhAwV2y FiEnK24nL8TAoWijHNI4/RDEeL4GVQkZjDM3VqEaP9o3hMeauMz7akBEydItfN0Xav aIIfIuD9exIcWIhTZlAGkMN14MJEacXCHmV49b17nskRmgfe4nYGbVqQ/gjt+7z8Wy CjVrTMbSENOprnPHAl+guVQ0Yz4de79CQuOUf4eiP1Ls0YAzjklhEe1hd0qRLUXDEw ZRc2oNA5Bkc+A== Message-ID: <8b42f0ad-2993-43b8-9055-6d74dc3bafbe@kernel.org> Date: Wed, 26 Feb 2025 08:51:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/8] dt-bindings: mfd: stm32-lptimer: add support for stm32mp25 To: Fabrice Gasnier Cc: lee@kernel.org, ukleinek@kernel.org, alexandre.torgue@foss.st.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, wbg@kernel.org, jic23@kernel.org, daniel.lezcano@linaro.org, tglx@linutronix.de, catalin.marinas@arm.com, will@kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, linux-pwm@vger.kernel.org, olivier.moysan@foss.st.com References: <20250224180150.3689638-1-fabrice.gasnier@foss.st.com> <20250224180150.3689638-2-fabrice.gasnier@foss.st.com> <20250225-outgoing-scorpion-of-music-be0bea@krzk-bin> 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-20250225_235128_435027_418081C4 X-CRM114-Status: GOOD ( 12.72 ) 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 25/02/2025 15:57, Fabrice Gasnier wrote: > On 2/25/25 13:02, Krzysztof Kozlowski wrote: >> On Mon, Feb 24, 2025 at 07:01:43PM +0100, Fabrice Gasnier wrote: >>> pwm: >>> type: object >>> additionalProperties: false >>> >>> properties: >>> compatible: >>> - const: st,stm32-pwm-lp >>> + enum: >>> + - st,stm32-pwm-lp >>> + - st,stm32mp25-pwm-lp >>> >>> "#pwm-cells": >>> const: 3 >>> @@ -69,7 +76,9 @@ properties: >>> >>> properties: >>> compatible: >>> - const: st,stm32-lptimer-counter >>> + enum: >>> + - st,stm32-lptimer-counter >>> + - st,stm32mp25-lptimer-counter >> >> Driver changes suggest many of these are compatible. Why isn't this expressed? > > Hi Krzysztof, > > The Low Power Timer (LPTIM) hardware isn't fully backward compatible. > > At driver level, as indicated in the cover-letter, same feature list as > on STM32MP1x is supported currently. This is probably what makes it look > like it's compatible, but it's not fully compatible. I don't understand. Same feature list is supported means fully compatible, but you say not fully compatible. You are aware that compatible means not the same? > > The hardware controller is a bit different. Some registers/bits has been > revisited among other things. This is the purpose for these new compatibles. We do not discuss new compatibles. We discuss lack of compatibility. If registers/bits are changed, how existing driver can work with same ID table? Best regards, Krzysztof