diff mbox series

[net-next,v13,11/14] net: mdio: Add Airoha AN8855 Switch MDIO Passtrough

Message ID 20250315154407.26304-12-ansuelsmth@gmail.com (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series net: dsa: Add Airoha AN8855 support | expand

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Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 1 maintainers not CCed: andrew@lunn.ch
netdev/build_clang success Errors and warnings before: 1 this patch: 1
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 4 this patch: 4
netdev/checkpatch warning WARNING: line length of 89 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest fail net-next-2025-03-15--21-00 (tests: 742)

Commit Message

Christian Marangi March 15, 2025, 3:43 p.m. UTC 
Add Airoha AN8855 Switch driver to register a MDIO passtrough as switch
address is shared with the internal PHYs and require additional page
handling.

This requires the upper Switch MFD to be probed and init to actually
work.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 MAINTAINERS                    |  1 +
 drivers/net/mdio/Kconfig       | 10 +++++++
 drivers/net/mdio/Makefile      |  1 +
 drivers/net/mdio/mdio-an8855.c | 49 ++++++++++++++++++++++++++++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 drivers/net/mdio/mdio-an8855.c
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index aec293953382..f4c8054d3980 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -731,6 +731,7 @@  F:	Documentation/devicetree/bindings/net/airoha,an8855-phy.yaml
 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
 
 AIROHA ETHERNET DRIVER
 M:	Lorenzo Bianconi <lorenzo@kernel.org>
diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig
index 4a7a303be2f7..e31a37064934 100644
--- a/drivers/net/mdio/Kconfig
+++ b/drivers/net/mdio/Kconfig
@@ -61,6 +61,16 @@  config MDIO_XGENE
 	  This module provides a driver for the MDIO busses found in the
 	  APM X-Gene SoC's.
 
+config MDIO_AN8855
+	tristate "Airoha AN8855 Switch MDIO bus controller"
+	depends on MFD_AIROHA_AN8855
+	depends on OF_MDIO
+	select MDIO_REGMAP
+	help
+	  This module provides a driver for the Airoha AN8855 Switch
+	  that requires a MDIO passtrough as switch address is shared
+	  with the internal PHYs and requires additional page handling.
+
 config MDIO_ASPEED
 	tristate "ASPEED MDIO bus controller"
 	depends on ARCH_ASPEED || COMPILE_TEST
diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile
index 1015f0db4531..546c4e55b475 100644
--- a/drivers/net/mdio/Makefile
+++ b/drivers/net/mdio/Makefile
@@ -5,6 +5,7 @@  obj-$(CONFIG_ACPI_MDIO)		+= acpi_mdio.o
 obj-$(CONFIG_FWNODE_MDIO)	+= fwnode_mdio.o
 obj-$(CONFIG_OF_MDIO)		+= of_mdio.o
 
+obj-$(CONFIG_MDIO_AN8855)		+= mdio-an8855.o
 obj-$(CONFIG_MDIO_ASPEED)		+= mdio-aspeed.o
 obj-$(CONFIG_MDIO_BCM_IPROC)		+= mdio-bcm-iproc.o
 obj-$(CONFIG_MDIO_BCM_UNIMAC)		+= mdio-bcm-unimac.o
diff --git a/drivers/net/mdio/mdio-an8855.c b/drivers/net/mdio/mdio-an8855.c
new file mode 100644
index 000000000000..22d199942f1c
--- /dev/null
+++ b/drivers/net/mdio/mdio-an8855.c
@@ -0,0 +1,49 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MDIO passthrough driver for Airoha AN8855 Switch
+ */
+
+#include <linux/mdio/mdio-regmap.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static int an8855_mdio_probe(struct platform_device *pdev)
+{
+	struct mdio_regmap_config mrc = { };
+	struct device *dev = &pdev->dev;
+	struct mii_bus *bus;
+
+	mrc.regmap = dev_get_regmap(dev->parent, "phy");
+	mrc.parent = dev;
+	mrc.valid_addr_mask = GENMASK(31, 0);
+	mrc.support_encoded_addr = true;
+	mrc.autoscan = true;
+	mrc.np = dev->of_node;
+	snprintf(mrc.name, MII_BUS_ID_SIZE, KBUILD_MODNAME);
+
+	bus = devm_mdio_regmap_register(dev, &mrc);
+	if (IS_ERR(bus))
+		return dev_err_probe(dev, PTR_ERR(bus), "failed to register MDIO bus\n");
+
+	return 0;
+}
+
+static const struct of_device_id an8855_mdio_of_match[] = {
+	{ .compatible = "airoha,an8855-mdio", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, an8855_mdio_of_match);
+
+static struct platform_driver an8855_mdio_driver = {
+	.probe	= an8855_mdio_probe,
+	.driver = {
+		.name = "an8855-mdio",
+		.of_match_table = an8855_mdio_of_match,
+	},
+};
+module_platform_driver(an8855_mdio_driver);
+
+MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
+MODULE_DESCRIPTION("Driver for AN8855 MDIO passthrough");
+MODULE_LICENSE("GPL");