From nobody Thu Oct 2 19:25:10 2025 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 59EBD3112C1 for ; Fri, 12 Sep 2025 13:14:27 +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=1757682867; cv=none; b=pMNZ2Hzt/hTIuon+X5lQMn7P83TXul7mQeHRNbe/BrIsOv1FrxfIG5Y2niOzXqzxY4pLCpHUKOcqUozmNkpqcQA+La4lquE8rt75CG+UWZPSibYIMZ+xVkbIRL2cBBJ4IVAgdjChnBG+VzVyJyU7I+jREQYzhC7mVJoUysmPYQM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757682867; c=relaxed/simple; bh=4jt0WH+ib9lMrNTRLeJ7mkZWBV7AKrfXxg/X9EzV/nY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aQEmfwk291+XKhs2Rrk8sMVHbHjHA9JiH8cdhZRoHrQ1XwFsxI4kWio6mhKgJrF+Ew+Ln/IoCyBC2REKR+S4KYQ5V4ST5pPYATieVocrUk3HMYQfPH1e39/poFgz9aX2gLvYqxCxNS0Tg+z3sO4gPNs+wOCItLFp2p/RmWW9Ra4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aZgusYff; 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="aZgusYff" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0D90CC4CEF7; Fri, 12 Sep 2025 13:14:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757682866; bh=4jt0WH+ib9lMrNTRLeJ7mkZWBV7AKrfXxg/X9EzV/nY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aZgusYffgwKndLCNjm033DHZPfxGStzMCI1RSzh4XssDJMSpnL11eMGeoZBVO3XCT 2zyazLtQJAXCk5multFrJozbGP5lB9Aq4GCVNyN8dp4sNDx1djFMyUJUIPkj3fzGkp Y8NYNOTl40Sz+JLnUD4WOxrVGr6EUCfnQ3yXYqJSZk0Po1xTjGWUEIzRVtft1pE3SA a2cevqr41+O6v2+wQtyXnKTT8yAWxYgar8+k+sh4vUww0C0Tdf8f3Iv77wuT4bhWrJ UvkGWCRAudn8ttRJQ2k935mDvKZDeuCjK1hoK1D3Hp0ZvV2pa0onYQIckN1Oo45JFD lXVoOo1cQzLgw== From: srini@kernel.org To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, Christian Marangi , Srinivas Kandagatla Subject: [PATCH 5/5] nvmem: an8855: Add support for Airoha AN8855 Switch EFUSE Date: Fri, 12 Sep 2025 14:14:15 +0100 Message-ID: <20250912131415.303407-6-srini@kernel.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250912131415.303407-1-srini@kernel.org> References: <20250912131415.303407-1-srini@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Christian Marangi Add support for Airoha AN8855 Switch EFUSE. These EFUSE might be used for calibration data for the internal switch PHYs. Signed-off-by: Christian Marangi Signed-off-by: Srinivas Kandagatla --- drivers/nvmem/Kconfig | 11 ++++++ drivers/nvmem/Makefile | 2 ++ drivers/nvmem/an8855-efuse.c | 68 ++++++++++++++++++++++++++++++++++++ 3 files changed, 81 insertions(+) create mode 100644 drivers/nvmem/an8855-efuse.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index f3b8ffa77528..e0d88d3199c1 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -28,6 +28,17 @@ source "drivers/nvmem/layouts/Kconfig" =20 # Devices =20 +config NVMEM_AN8855_EFUSE + tristate "Airoha AN8855 eFuse support" + depends on MFD_AIROHA_AN8855 || COMPILE_TEST + help + Say y here to enable support for reading eFuses on Airoha AN8855 + Switch. These are e.g. used to store factory programmed + calibration data required for the PHY. + + This driver can also be built as a module. If so, the module will + be called nvmem-an8855-efuse. + config NVMEM_APPLE_EFUSES tristate "Apple eFuse support" depends on ARCH_APPLE || COMPILE_TEST diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 5634945f8196..70a4464dcb1e 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -10,6 +10,8 @@ nvmem_layouts-y :=3D layouts.o obj-y +=3D layouts/ =20 # Devices +obj-$(CONFIG_NVMEM_AN8855_EFUSE) +=3D nvmem-an8855-efuse.o +nvmem-an8855-efuse-y :=3D an8855-efuse.o obj-$(CONFIG_NVMEM_APPLE_EFUSES) +=3D nvmem-apple-efuses.o nvmem-apple-efuses-y :=3D apple-efuses.o obj-$(CONFIG_NVMEM_APPLE_SPMI) +=3D apple_nvmem_spmi.o diff --git a/drivers/nvmem/an8855-efuse.c b/drivers/nvmem/an8855-efuse.c new file mode 100644 index 000000000000..d1afde6f623f --- /dev/null +++ b/drivers/nvmem/an8855-efuse.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Airoha AN8855 Switch EFUSE Driver + */ + +#include +#include +#include +#include +#include + +#define AN8855_EFUSE_CELL 50 + +#define AN8855_EFUSE_DATA0 0x1000a500 +#define AN8855_EFUSE_R50O GENMASK(30, 24) + +static int an8855_efuse_read(void *context, unsigned int offset, + void *val, size_t bytes) +{ + struct regmap *regmap =3D context; + + return regmap_bulk_read(regmap, AN8855_EFUSE_DATA0 + offset, + val, bytes / sizeof(u32)); +} + +static int an8855_efuse_probe(struct platform_device *pdev) +{ + struct nvmem_config an8855_nvmem_config =3D { + .name =3D "an8855-efuse", + .size =3D AN8855_EFUSE_CELL * sizeof(u32), + .stride =3D sizeof(u32), + .word_size =3D sizeof(u32), + .reg_read =3D an8855_efuse_read, + }; + struct device *dev =3D &pdev->dev; + struct nvmem_device *nvmem; + struct regmap *regmap; + + /* Assign NVMEM priv to MFD regmap */ + regmap =3D dev_get_regmap(dev->parent, NULL); + if (!regmap) + return -ENOENT; + + an8855_nvmem_config.priv =3D regmap; + an8855_nvmem_config.dev =3D dev; + nvmem =3D devm_nvmem_register(dev, &an8855_nvmem_config); + + return PTR_ERR_OR_ZERO(nvmem); +} + +static const struct of_device_id an8855_efuse_of_match[] =3D { + { .compatible =3D "airoha,an8855-efuse", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, an8855_efuse_of_match); + +static struct platform_driver an8855_efuse_driver =3D { + .probe =3D an8855_efuse_probe, + .driver =3D { + .name =3D "an8855-efuse", + .of_match_table =3D an8855_efuse_of_match, + }, +}; +module_platform_driver(an8855_efuse_driver); + +MODULE_AUTHOR("Christian Marangi "); +MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE"); +MODULE_LICENSE("GPL"); --=20 2.50.0