From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 245451E1DE1; Wed, 26 Feb 2025 07:54:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740556451; cv=none; b=g9UuBlH3PHutYy6ouUmjx9n3f9SkP4bxzGPbN/8TQSqH2JT64JZi7U+KdK9lsjsAuS6ZPuCZ+mOkt/HiJWvD7X2Rhcvxd/yz19PT36OTWY2TqgHNjcqxoGRKUkqdLxNiK4Dp8k9LaQ9UdJjcDQCg4HuEaiiEoH5CGybLVAU6dj0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740556451; c=relaxed/simple; bh=92ToKjMng5UJUg3byfnfnCY3Q+fzsJoKi/ZAArA68TU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=bmh7383RgnChYWLeHGA21F6Lw5zzhbU1XTI9Pr1HUvkeSaFCYVjD9tYCLYBAV3HJMkSjG6W7fJrWqf3JU7qdqaOlPIIZ89CEck+W6Gr4Pl0XcH8SZCIiiIudxcfvsYDRREh6/FgBdAY/T584YDkC09Ug7bIg0ELwZcIXBFWnkNQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ce6nZdwn; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ce6nZdwn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CE84C4CED6; Wed, 26 Feb 2025 07:54:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740556450; bh=92ToKjMng5UJUg3byfnfnCY3Q+fzsJoKi/ZAArA68TU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ce6nZdwnF5HOI22QJhzYb5t8RwkQjtWsnao+FKm1SpQOChhAwFCdysaLhkPDn04Cv NLqqqCVkdQ4hXH/0C8lupYVVQwdw74TRcto1HT22ydBm6UPA0aHHuiW3FCDrfBQiWj YQTGu9w88jPqL5CC4ixAE41VGoRyTl8y/CUrrQMGB8G3VQN9BcaRzFbZJFCXw60UKx T5X+8mD8ZR3+2UMmMa+BzJi5fp1TtWDewmKuZzXpJ7XiZhlbrlCi5Hl57n6l+O/Hir /uD02db9EF+GZeXCdMQq1cmLZbL3oO4UHX082Akmi0g/thcbG2F68JUnBk6h+UkHSJ jFIOpzoK8m2WA== Message-ID: Date: Wed, 26 Feb 2025 08:54:03 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/8] pwm: stm32-lp: 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> <20250224180150.3689638-6-fabrice.gasnier@foss.st.com> <20250225-psychedelic-iguana-of-education-d5fff7@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 On 25/02/2025 15:58, Fabrice Gasnier wrote: > > > On 2/25/25 13:04, Krzysztof Kozlowski wrote: >> On Mon, Feb 24, 2025 at 07:01:47PM +0100, Fabrice Gasnier wrote: >>> } >>> >>> return pinctrl_pm_select_sleep_state(dev); >>> @@ -246,6 +413,7 @@ static DEFINE_SIMPLE_DEV_PM_OPS(stm32_pwm_lp_pm_ops, stm32_pwm_lp_suspend, >>> >>> static const struct of_device_id stm32_pwm_lp_of_match[] = { >>> { .compatible = "st,stm32-pwm-lp", }, >>> + { .compatible = "st,stm32mp25-pwm-lp", }, >> >> No driver data suggests device is backwards compatible. Commit msg >> suggests not, so that's confusing. > > > The LPTimer PWM driver takes benefit of the MFD parent driver to feed in > data, e.g. 'num_cc_chans'. Number of channels is now variable, on This means this ID table is useless. You do the matching via parent device, so stop growing the table and call it deprecated or something. > STM32MP25 (e.g. not a single channel). But it can't be hard-coded as > compatible data. (there's only 1 channel on earlier LP Timer hardware > revision). > > The hardware controller is a bit different, hence the new compatible If it works with old compatible, it's an easy proof that it is compatible, so please counter argument that with something specific. What is different that driver cannot work with new device using old interface or old features? Best regards, Krzysztof