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 0842D22A4FE; Mon, 4 Aug 2025 07:27:04 +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=1754292425; cv=none; b=VhYHl6M+x5lDPHIy28yukQgmXngoQH/7I6BGt3vYIeIbxlgfdQcVi4WYuchdRSioTYnJ1NixxnccRiIAiM4l6J03i5hsyw5QO2OHGVmDxOkx+XpWORCuHt+fE5rYiiJSvGFSgmaPicsErPsxkGeKnEHZoKMK6Moh4l4EGgnx22o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754292425; c=relaxed/simple; bh=fbeMNsknj1jfMdMlUI3wgsG87na3shk5ZcyK+AxPEUQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=TVbl57gk3sFA3gk/Ohb3nUGP6SkIrfomdvPJGE0jIbQWSGvOMjuMVqU1YWl9EtYz2AIc2vbWPg0Vta6OHQ9hnYLEmjnPhhZu9+wZizuLxdyayJIHh/wynh1N7KdfI4lb0qX+fY3BMdQL3BG0coV1WRUyg64ju2xN7uVupfjzn2M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OjPij6bW; 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="OjPij6bW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B49DFC4CEE7; Mon, 4 Aug 2025 07:26:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754292424; bh=fbeMNsknj1jfMdMlUI3wgsG87na3shk5ZcyK+AxPEUQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=OjPij6bWmzP0LitMnDkrFzaaGn/cbOohwvU/4ZlF0cQ+i3b/jKxiDDRR4NHr/muzx a/7CnvlsggRtq1eBFysjnqUpBK6V+rCeyvFsT4xCC7bRwo0E4HvIcKWSbUFAxE/LQV 5O4yt7bk7CyEpDSi3hvwoF0zyTT1312B3C/JFWuukVB4rbvQH2BlPdXSuIa/4ctFDB Eq+p4YDB9x+E6vYpQMj+eFXDpgvfHdWORFQBnras3qxGRYrYWAuDBuqzmpWIMPaTpH Kq/FjynfBBGvv2g5uGlaGH3IaCu9j0v+nlTl8cNP/YU70fNIDt/YuTUKhxS10NorlU DQm9AzjxdTSVg== Message-ID: Date: Mon, 4 Aug 2025 09:26:55 +0200 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 v7 10/12] nvmem: s32g2_siul2: add NVMEM driver for SoC information To: Andrei Stefanescu , Arnd Bergmann , Linus Walleij , Bartosz Golaszewski , Rob Herring , krzk+dt@kernel.org, Conor Dooley , Chester Lin , Matthias Brugger , Ghennadi Procopciuc , Larisa Grigore , Lee Jones , Shawn Guo , Sascha Hauer , Fabio Estevam , aisheng.dong@nxp.com, Jacky Bai , Greg Kroah-Hartman , "Rafael J . Wysocki" , Srinivas Kandagatla Cc: "open list:GPIO SUBSYSTEM" , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, NXP S32 Linux Team , Christophe Lizzi , Alberto Ruiz , Enric Balletbo , echanude@redhat.com, Pengutronix Kernel Team , imx@lists.linux.dev, Vincent Guittot References: <20250710142038.1986052-1-andrei.stefanescu@oss.nxp.com> <20250710142038.1986052-11-andrei.stefanescu@oss.nxp.com> <9d004ea4-0bb2-4a21-8501-82ecf3482c3e@app.fastmail.com> <53bc13b9-365e-4212-84f9-85e67c23e067@oss.nxp.com> <7902bac4-9f52-443c-995f-a15189102478@kernel.org> <0973e6d1-2823-4bfb-be73-b532c6f86784@oss.nxp.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJoF1BKBQkWlnSaAAoJEBuTQ307 QWKbHukP/3t4tRp/bvDnxJfmNdNVn0gv9ep3L39IntPalBFwRKytqeQkzAju0whYWg+R/rwp +r2I1Fzwt7+PTjsnMFlh1AZxGDmP5MFkzVsMnfX1lGiXhYSOMP97XL6R1QSXxaWOpGNCDaUl ajorB0lJDcC0q3xAdwzRConxYVhlgmTrRiD8oLlSCD5baEAt5Zw17UTNDnDGmZQKR0fqLpWy 786Lm5OScb7DjEgcA2PRm17st4UQ1kF0rQHokVaotxRM74PPDB8bCsunlghJl1DRK9s1aSuN hL1Pv9VD8b4dFNvCo7b4hfAANPU67W40AaaGZ3UAfmw+1MYyo4QuAZGKzaP2ukbdCD/DYnqi tJy88XqWtyb4UQWKNoQqGKzlYXdKsldYqrLHGoMvj1UN9XcRtXHST/IaLn72o7j7/h/Ac5EL 8lSUVIG4TYn59NyxxAXa07Wi6zjVL1U11fTnFmE29ALYQEXKBI3KUO1A3p4sQWzU7uRmbuxn naUmm8RbpMcOfa9JjlXCLmQ5IP7Rr5tYZUCkZz08LIfF8UMXwH7OOEX87Y++EkAB+pzKZNNd hwoXulTAgjSy+OiaLtuCys9VdXLZ3Zy314azaCU3BoWgaMV0eAW/+gprWMXQM1lrlzvwlD/k whyy9wGf0AEPpLssLVt9VVxNjo6BIkt6d1pMg6mHsUEVzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmgXUF8FCRaWWyoACgkQG5NDfTtBYptO0w//dlXJs5/42hAXKsk+PDg3wyEFb4NpyA1v qmx7SfAzk9Hf6lWwU1O6AbqNMbh6PjEwadKUk1m04S7EjdQLsj/MBSgoQtCT3MDmWUUtHZd5 RYIPnPq3WVB47GtuO6/u375tsxhtf7vt95QSYJwCB+ZUgo4T+FV4hquZ4AsRkbgavtIzQisg Dgv76tnEv3YHV8Jn9mi/Bu0FURF+5kpdMfgo1sq6RXNQ//TVf8yFgRtTUdXxW/qHjlYURrm2 H4kutobVEIxiyu6m05q3e9eZB/TaMMNVORx+1kM3j7f0rwtEYUFzY1ygQfpcMDPl7pRYoJjB dSsm0ZuzDaCwaxg2t8hqQJBzJCezTOIkjHUsWAK+tEbU4Z4SnNpCyM3fBqsgYdJxjyC/tWVT AQ18NRLtPw7tK1rdcwCl0GFQHwSwk5pDpz1NH40e6lU+NcXSeiqkDDRkHlftKPV/dV+lQXiu jWt87ecuHlpL3uuQ0ZZNWqHgZoQLXoqC2ZV5KrtKWb/jyiFX/sxSrodALf0zf+tfHv0FZWT2 zHjUqd0t4njD/UOsuIMOQn4Ig0SdivYPfZukb5cdasKJukG1NOpbW7yRNivaCnfZz6dTawXw XRIV/KDsHQiyVxKvN73bThKhONkcX2LWuD928tAR6XMM2G5ovxLe09vuOzzfTWQDsm++9UKF a/A= In-Reply-To: <0973e6d1-2823-4bfb-be73-b532c6f86784@oss.nxp.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 04/08/2025 09:12, Andrei Stefanescu wrote: > Hi Krzysztof, > > Thank you for the quick response! > On 02/08/2025 11:32, Krzysztof Kozlowski wrote: >> On 02/08/2025 10:28, Krzysztof Kozlowski wrote: >>> On 01/08/2025 16:36, Andrei Stefanescu wrote: >>>> Apart from the proposed NVMEM driver, there is also an option of exporting >>>> a syscon regmap for the registers which provide information about the SoC. >>>> >>>> I have seen that typically NVMEM drivers export information read from fuses >>>> but I think having a NVMEM driver is nicer way to access the information >>>> instead of using a syscon regmap and manually extracting the needed bits. >>> >>> >>> nvmem is not a syscon. Mixing these two means device is something >>> completely else. > > Yes, I don't want to mix them. The driver will either be a NVMEM driver or > a syscon. These registers are read-only. I suggested NVMEM because it's a We do not talk about drivers here, but hardware. > an abstraction layer which makes it easier for drivers which want to use > that information without knowing where to actually read it i.e. reg address, > bit mask. Sorry, but no. You design it for drivers, that's not the way. Describe properly the hardware. Best regards, Krzysztof