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Message-ID: <20241209134459.27110-8-ansuelsmth@gmail.com>
Date: Mon, 9 Dec 2024 14:44:24 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Christian Marangi <ansuelsmth@...il.com>,
Lee Jones <lee@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Vladimir Oltean <olteanv@...il.com>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
netdev@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
upstream@...oha.com
Subject: [net-next PATCH v11 7/9] nvmem: an8855: Add support for Airoha AN8855 Switch EFUSE
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 <ansuelsmth@...il.com>
---
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 38c7b2362c92..a67d147276a1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -723,6 +723,7 @@ 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 <lorenzo@...nel.org>
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..7940453d6e58
--- /dev/null
+++ b/drivers/nvmem/an8855-efuse.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Airoha AN8855 Switch EFUSE Driver
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#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, NULL);
+ 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 <ansuelsmth@...il.com>");
+MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE");
+MODULE_LICENSE("GPL");
--
2.45.2
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