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 E85BA2222AC; Thu, 5 Mar 2026 10:46:44 +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=1772707605; cv=none; b=l2ccoTaP7LhMg9wpf6uL3JwGUm2ryD12PLJms7QgYFHFOA7eGEgrZUuxhejxYub0cbhY+YlcPU7bj3wLfQkeKttlvJMKlFfwSKiOtGZJWU2Li0HYEVeYbvOvuctOmP0x3jVkf/jhGc/lesgsLSCAQVmoAGzDpgbJ+7LJ7VQbbjM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772707605; c=relaxed/simple; bh=1lEbzZR//+Yc7K5TUFwZ97IJ+ukRCAnqOXR6JFDQSz8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=rhGnNJNvPZ4Ff2mD5TY6xUL1hJSMxseoDUVkD/ag+YBHh+7R3qR2E+yrdTdnlc67UPzKEv7zVa3kmImJJF84MMwwN5phJnG8vsz3HugvVFWbdaWnmU3KsgiKA2bP5jojjd9Uchm5kXloNKkOzVgJhDHQIeW9Bz/N2nFTFZOdSKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WJr3xQBD; 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="WJr3xQBD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CCF16C116C6; Thu, 5 Mar 2026 10:46:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772707604; bh=1lEbzZR//+Yc7K5TUFwZ97IJ+ukRCAnqOXR6JFDQSz8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=WJr3xQBDAxaMYTCCGl2Xbz20BXRD6QC+6s6ohVgHv/LcHsWM2PiFV8WKvYkXErAgh /6Z0VzJVi3XLYRbUIXMIvT3/pn9p3eguvUQi24ogjaTEuNh0d9Jo5y3FzNhCFI9DhE CLdg3fF8TnnlJup63/KKl2eCrCMVugrV9Dn/uTKZcYToPTZNTdSHDPStx3z0bL/mD9 3/bLws5REUCiXxgb1Q+KJDNye62w7b0KdvtNAnNWWGLq0JFuSLMXKN7D3gcGwnEaJV vq60lyySCrhNmrAswIJrNg8y/Hnbv4KD8q+gsODmMFa7PgEOeQPtqHsvZ8VEIh0V7s rMCs0AOPuJPkQ== Message-ID: <8d991c0f-3244-4c0a-af4a-8d7aeb8ca35b@kernel.org> Date: Thu, 5 Mar 2026 11:46:40 +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] mmc: pwrseq_simple: fix probe failure when CONFIG_RESET_GPIO is enabled To: Bartosz Golaszewski , Philipp Zabel Cc: Sergey Suloev , ulf.hansson@linaro.org, catalin.popescu@leica-geosystems.com, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Walleij References: <20260220194725.1341281-1-sergey.suloev@gmail.com> <923d35430a633af4064d671f1cac1d47780cd14f.camel@pengutronix.de> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 05/03/2026 11:04, Bartosz Golaszewski wrote: > >>> Philipp, Krzysztof: what do you think? >> >> I think this is a missing feature in reset-gpio. >> This driver could fall back to to devm_gpiod_get_array() also if >> devm_reset_control_get_optional_shared() returns -ENOENT instead of >> erroring out (maybe -ENOTSUPP would be a better return code for [1]?). >> > > I did not write the initial version but Krzysztof: is there any reason we only > support a single, two-cell GPIO? Would it be problematic to support any kind of > reset GPIO setup? It was only due to limitation of my initial solution - see even a TODO note in reset/core.c. I think the problem I had is that GPIO specifier without flags (so cells=1) would mess with GPIO_LOOKUP(). And if we have cells=3, where do the flags are? If you assume flags are last argument, that's an implied ABI encoded in the reset core. Well, heh, implied ABI that 2nd argument are flags is already there, so the code is partially hacky, I agree. So honestly I believe that GPIO core should handle all this mapping of original reset-gpios property into platform data to reset-gpio driver. That's the answer for your question "would it be problematic". For reference, original patch: https://lore.kernel.org/all/20240129115216.96479-5-krzysztof.kozlowski@linaro.org/ Best regards, Krzysztof