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[95.249.236.54]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-45decf8759esm13526385e9.23.2025.09.08.17.44.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Sep 2025 17:44:02 -0700 (PDT) From: Christian Marangi To: Christian Marangi , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vladimir Oltean , Srinivas Kandagatla , Heiner Kallweit , Russell King , "Chester A. Unal" , Daniel Golle , DENG Qingfang , Sean Wang , Simon Horman , Matthias Brugger , AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [net-next PATCH v16 05/10] nvmem: an8855: Add support for Airoha AN8855 Switch EFUSE Date: Tue, 9 Sep 2025 02:43:36 +0200 Message-ID: <20250909004343.18790-6-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250909004343.18790-1-ansuelsmth@gmail.com> References: <20250909004343.18790-1-ansuelsmth@gmail.com> 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" 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 --- 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 edd811444ce5..446818a875da 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 2021d59688db..5c9e6e450181 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 2.51.0