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 9389E3CAE81; Thu, 11 Jun 2026 10:21:36 +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=1781173296; cv=none; b=gJ7CpsxkL0ServS8fNGasvfIRm7TOXzuHO3dY1JXbs7P31eW62+3eqv1E6A/JqahxpC7iyelYsNtBy/PGbBFkIycqqstP+9kDlmgDA5m5i2hWWGe2TcqHIVkaIZsqB/swjQ3nc+ygjD6Tnpww50LciTfT6qPjNAHV0/z/mTojdE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781173296; c=relaxed/simple; bh=9IDMaAlQtsjKOIQBBeL+4XPxMsE/W5bBtqkLpBKKNoo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rr/rLlzFNbUSIGpr/Eyd9VF48CDacQ2nwbLyLCkr02OqeuihX/PlKFsGaL5lvnMiCIz1aS5wMqMTjkjEtk6zuu5xy2148RpjqjDAbVHogJxASk2ppvh/3RiYIxRPS3BZSTH+xSZBlVD6vFzzczY7MgifEdZJm2eKHCSnnr+wSQQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=J9mVXvqo; 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="J9mVXvqo" Received: by smtp.kernel.org (Postfix) with ESMTPS id 4BC34C4AF0E; Thu, 11 Jun 2026 10:21:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1781173296; bh=9IDMaAlQtsjKOIQBBeL+4XPxMsE/W5bBtqkLpBKKNoo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=J9mVXvqoxd4zux8dC1PfpaQWLxKdxgS0dRDXZ7ye66+io2eS3RPeOurttTHTj78Bj MXyh5EZcNlN1AQugNhB5VZODARu64C/oa9cczmOj4mJwVUN+/SwRyf37TGsvMUj27q NfXdjKYAI4Yvd/egiSmMPbDvTusU+frNBN5gxyxDM3kSmB900t+w3baKyJVk8qFQa7 ++4VIZEgLT+ru1Z3N6JEeOgW78wXWO3pD4+SI6hRNiwlsGpnILcB4wzrnRjagw1c15 yxcB5eZvDkTkwlSdaC2D8DER7LcDU63LA+nktvzzV+G4t7BcjOT1zq2mjxZhdtIOvS EgZTKJYTWQo/g== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36FF2CD98CC; Thu, 11 Jun 2026 10:21:36 +0000 (UTC) From: Roman Vivchar via B4 Relay Date: Thu, 11 Jun 2026 13:20:30 +0300 Subject: [PATCH 2/4] nvmem: add mt6323 PMIC EFUSE driver Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260611-mt6323-nvmem-v1-2-b5e1b9ce51f2@protonmail.com> References: <20260611-mt6323-nvmem-v1-0-b5e1b9ce51f2@protonmail.com> In-Reply-To: <20260611-mt6323-nvmem-v1-0-b5e1b9ce51f2@protonmail.com> To: Sen Chu , Sean Wang , Macpaul Lin , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Srinivas Kandagatla , Roman Vivchar Cc: Andy Shevchenko , Jonathan Cameron , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Ben Grisdale X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1781173294; l=4931; i=rva333@protonmail.com; s=20260510; h=from:subject:message-id; bh=KsbjEAloAAIy48Eb2U9z3icro5Exk+g8fJVk1pBv6/s=; b=laaj3PVYWZcdKVUQ7UO4TxWDG+BnFouTrAwl5FBrQsUNCO3+9zb/u0hOdKUkgOspg4oTVcq6q T9PohHxrpOeAby/TvfVmngT0CcxjqDr2V+Uio3Kph6StCLIeeJDxFgr X-Developer-Key: i=rva333@protonmail.com; a=ed25519; pk=zww/nWjBGoQ4POXCG0BV6fx2iuXK6jx77rsKPA5YK5Y= X-Endpoint-Received: by B4 Relay for rva333@protonmail.com/20260510 with auth_id=777 X-Original-From: Roman Vivchar Reply-To: rva333@protonmail.com From: Roman Vivchar Add support for the EFUSE controller found in the Mediatek MT6323 PMIC. The MT6323 EFUSE stores 24 bytes of hardware-related data, such as thermal sensor calibration values. Tested-by: Ben Grisdale # Amazon Echo Dot (2nd Generation) Signed-off-by: Roman Vivchar --- MAINTAINERS | 5 +++ drivers/nvmem/Kconfig | 11 ++++++ drivers/nvmem/Makefile | 2 ++ drivers/nvmem/mt6323-efuse.c | 85 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 103 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index d1cc0e12fe1f..910360f148c4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16256,6 +16256,11 @@ S: Maintained F: Documentation/devicetree/bindings/mmc/mtk-sd.yaml F: drivers/mmc/host/mtk-sd.c +MEDIATEK MT6323 PMIC NVMEM DRIVER +M: Roman Vivchar +S: Maintained +F: drivers/nvmem/mt6323-efuse.c + MEDIATEK MT6735 CLOCK & RESET DRIVERS M: Yassine Oudjana L: linux-clk@vger.kernel.org diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 74ddbd0f79b0..db248a3c4e87 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -227,6 +227,17 @@ config NVMEM_MTK_EFUSE This driver can also be built as a module. If so, the module will be called efuse-mtk. +config NVMEM_MT6323_EFUSE + tristate "Mediatek MT6323 PMIC EFUSE support" + depends on ARCH_MEDIATEK || COMPILE_TEST + depends on MFD_MT6397 + help + This is a driver to access hardware related data like sensor + calibration, etc. + + This driver can also be built as a module. If so, the module + will be called efuse-mt6323. + config NVMEM_MXS_OCOTP tristate "Freescale MXS On-Chip OTP Memory Support" depends on ARCH_MXS || COMPILE_TEST diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 7252b8ec88d4..0e2b73f42b25 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -48,6 +48,8 @@ obj-$(CONFIG_NVMEM_MICROCHIP_OTPC) += nvmem-microchip-otpc.o nvmem-microchip-otpc-y := microchip-otpc.o obj-$(CONFIG_NVMEM_MTK_EFUSE) += nvmem_mtk-efuse.o nvmem_mtk-efuse-y := mtk-efuse.o +obj-$(CONFIG_NVMEM_MT6323_EFUSE) += nvmem_mt6323-efuse.o +nvmem_mt6323-efuse-y := mt6323-efuse.o obj-$(CONFIG_NVMEM_MXS_OCOTP) += nvmem-mxs-ocotp.o nvmem-mxs-ocotp-y := mxs-ocotp.o obj-$(CONFIG_NVMEM_NINTENDO_OTP) += nvmem-nintendo-otp.o diff --git a/drivers/nvmem/mt6323-efuse.c b/drivers/nvmem/mt6323-efuse.c new file mode 100644 index 000000000000..c6fbfd96ac04 --- /dev/null +++ b/drivers/nvmem/mt6323-efuse.c @@ -0,0 +1,85 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2026 Roman Vivchar + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +#define MT6323_EFUSE_DOUT_BASE MT6323_EFUSE_DOUT_0_15 +#define MT6323_EFUSE_SIZE 24 + +static int mt6323_efuse_read(void *context, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *map = context; + u32 tmp; + u16 *buf = val; + int ret; + + /* + * A manual loop using regmap_read is required because PWRAP is not + * a continuous MMIO space, but rather a FSM that doesn't implement the + * necessary read callback for the regmap_read_raw and regmap_read_bulk + * functions. + */ + for (size_t i = 0; i < bytes; i += sizeof(*buf)) { + ret = regmap_read(map, MT6323_EFUSE_DOUT_BASE + offset + i, &tmp); + if (ret) + return ret; + + *buf++ = tmp; + } + + return 0; +} + +static int mt6323_efuse_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct nvmem_config config = { + .name = "mt6323-efuse", + .stride = 2, + .word_size = 2, + .size = MT6323_EFUSE_SIZE, + .reg_read = mt6323_efuse_read, + }; + struct nvmem_device *nvmem; + struct regmap *regmap; + + /* efuse -> mfd -> pwrap */ + regmap = dev_get_regmap(dev->parent->parent, NULL); + if (!regmap) + return dev_err_probe(dev, -ENODEV, "failed to get regmap\n"); + + config.dev = dev; + config.priv = regmap; + + nvmem = devm_nvmem_register(dev, &config); + return PTR_ERR_OR_ZERO(nvmem); +} + +static const struct of_device_id mt6323_efuse_of_match[] = { + { .compatible = "mediatek,mt6323-efuse" }, + { } +}; +MODULE_DEVICE_TABLE(of, mt6323_efuse_of_match); + +static struct platform_driver mt6323_efuse_driver = { + .probe = mt6323_efuse_probe, + .driver = { + .name = "mt6323-efuse", + .of_match_table = mt6323_efuse_of_match, + }, +}; +module_platform_driver(mt6323_efuse_driver); + +MODULE_DESCRIPTION("MediaTek MT6323 PMIC EFUSE driver"); +MODULE_LICENSE("GPL"); -- 2.54.0