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[93.34.90.129]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-43d1fe0636dsm53464195e9.11.2025.03.15.08.44.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Mar 2025 08:44:58 -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 , Maxime Chevallier , 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, upstream@airoha.com Subject: [net-next PATCH v13 12/14] nvmem: an8855: Add support for Airoha AN8855 Switch EFUSE Date: Sat, 15 Mar 2025 16:43:52 +0100 Message-ID: <20250315154407.26304-13-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250315154407.26304-1-ansuelsmth@gmail.com> References: <20250315154407.26304-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org 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 --- MAINTAINERS | 1 + drivers/nvmem/Kconfig | 11 +++++++ drivers/nvmem/Makefile | 2 ++ drivers/nvmem/an8855-efuse.c | 63 ++++++++++++++++++++++++++++++++++++ 4 files changed, 77 insertions(+) create mode 100644 drivers/nvmem/an8855-efuse.c diff --git a/MAINTAINERS b/MAINTAINERS index f4c8054d3980..2cc8871186d5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -732,6 +732,7 @@ F: Documentation/devicetree/bindings/net/dsa/airoha,an8855-switch.yaml F: Documentation/devicetree/bindings/nvmem/airoha,an8855-efuse.yaml F: drivers/mfd/airoha-an8855.c F: drivers/net/mdio/mdio-an8855.c +F: drivers/nvmem/an8855-efuse.c AIROHA ETHERNET DRIVER M: Lorenzo Bianconi diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 8671b7c974b9..ca96c6ea685a 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -28,6 +28,17 @@ source "drivers/nvmem/layouts/Kconfig" # Devices +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 5b77bbb6488b..c732132c0e45 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -10,6 +10,8 @@ nvmem_layouts-y := layouts.o obj-y += layouts/ # Devices +obj-$(CONFIG_NVMEM_AN8855_EFUSE) += nvmem-an8855-efuse.o +nvmem-an8855-efuse-y := an8855-efuse.o obj-$(CONFIG_NVMEM_APPLE_EFUSES) += nvmem-apple-efuses.o nvmem-apple-efuses-y := apple-efuses.o obj-$(CONFIG_NVMEM_BCM_OCOTP) += nvmem-bcm-ocotp.o diff --git a/drivers/nvmem/an8855-efuse.c b/drivers/nvmem/an8855-efuse.c new file mode 100644 index 000000000000..cd1564379098 --- /dev/null +++ b/drivers/nvmem/an8855-efuse.c @@ -0,0 +1,63 @@ +// 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 = 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 = { + .name = "an8855-efuse", + .size = AN8855_EFUSE_CELL * sizeof(u32), + .stride = sizeof(u32), + .word_size = sizeof(u32), + .reg_read = an8855_efuse_read, + }; + struct device *dev = &pdev->dev; + struct nvmem_device *nvmem; + + /* Assign NVMEM priv to MFD regmap */ + an8855_nvmem_config.priv = dev_get_regmap(dev->parent, "switch"); + an8855_nvmem_config.dev = dev; + nvmem = devm_nvmem_register(dev, &an8855_nvmem_config); + + return PTR_ERR_OR_ZERO(nvmem); +} + +static const struct of_device_id an8855_efuse_of_match[] = { + { .compatible = "airoha,an8855-efuse", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, an8855_efuse_of_match); + +static struct platform_driver an8855_efuse_driver = { + .probe = an8855_efuse_probe, + .driver = { + .name = "an8855-efuse", + .of_match_table = an8855_efuse_of_match, + }, +}; +module_platform_driver(an8855_efuse_driver); + +MODULE_AUTHOR("Christian Marangi "); +MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE"); +MODULE_LICENSE("GPL");