[RFC v3 net-next 0/4] MT7530 interrupt support

[RFC v3 net-next 0/4] MT7530 interrupt support

[DENG Qingfang]

Add support for MT7530 interrupt controller.

DENG Qingfang (4):
  net: phy: add MediaTek PHY driver
  net: dsa: mt7530: add interrupt support
  dt-bindings: net: dsa: add MT7530 interrupt controller binding
  staging: mt7621-dts: enable MT7530 interrupt controller

 .../devicetree/bindings/net/dsa/mt7530.txt    |   5 +
 drivers/net/dsa/Kconfig                       |   1 +
 drivers/net/dsa/mt7530.c                      | 266 ++++++++++++++++--
 drivers/net/dsa/mt7530.h                      |  20 +-
 drivers/net/phy/Kconfig                       |   5 +
 drivers/net/phy/Makefile                      |   1 +
 drivers/net/phy/mediatek.c                    | 112 ++++++++
 drivers/staging/mt7621-dts/mt7621.dtsi        |   3 +
 8 files changed, 384 insertions(+), 29 deletions(-)
 create mode 100644 drivers/net/phy/mediatek.c

-- 
2.25.1

[RFC v3 net-next 1/4] net: phy: add MediaTek PHY driver

[DENG Qingfang]

Add support for MediaTek PHYs found in MT7530 and MT7531 switches.
The initialization procedure is from the vendor driver, but due to lack
of documentation, the function of some register values remains unknown.

Signed-off-by: DENG Qingfang <dqfext@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
RFC v2 -> RFC v3:
- No changes.

 drivers/net/phy/Kconfig    |   5 ++
 drivers/net/phy/Makefile   |   1 +
 drivers/net/phy/mediatek.c | 112 +++++++++++++++++++++++++++++++++++++
 3 files changed, 118 insertions(+)
 create mode 100644 drivers/net/phy/mediatek.c

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index a615b3660b05..edd858cec9ec 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -207,6 +207,11 @@ config MARVELL_88X2222_PHY
 	  Support for the Marvell 88X2222 Dual-port Multi-speed Ethernet
 	  Transceiver.
 
+config MEDIATEK_PHY
+	tristate "MediaTek PHYs"
+	help
+	  Supports the MediaTek switch integrated PHYs.
+
 config MICREL_PHY
 	tristate "Micrel PHYs"
 	help
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index de683e3abe63..9ed7dbab7770 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_LXT_PHY)		+= lxt.o
 obj-$(CONFIG_MARVELL_10G_PHY)	+= marvell10g.o
 obj-$(CONFIG_MARVELL_PHY)	+= marvell.o
 obj-$(CONFIG_MARVELL_88X2222_PHY)	+= marvell-88x2222.o
+obj-$(CONFIG_MEDIATEK_PHY)	+= mediatek.o
 obj-$(CONFIG_MESON_GXL_PHY)	+= meson-gxl.o
 obj-$(CONFIG_MICREL_KS8995MA)	+= spi_ks8995.o
 obj-$(CONFIG_MICREL_PHY)	+= micrel.o
diff --git a/drivers/net/phy/mediatek.c b/drivers/net/phy/mediatek.c
new file mode 100644
index 000000000000..1faed57e2ed9
--- /dev/null
+++ b/drivers/net/phy/mediatek.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/version.h>
+
+#define MTK_EXT_PAGE_ACCESS		0x1f
+#define MTK_PHY_PAGE_STANDARD		0x0000
+#define MTK_PHY_PAGE_EXTENDED		0x0001
+#define MTK_PHY_PAGE_EXTENDED_2		0x0002
+#define MTK_PHY_PAGE_EXTENDED_3		0x0003
+#define MTK_PHY_PAGE_EXTENDED_2A30	0x2a30
+#define MTK_PHY_PAGE_EXTENDED_52B5	0x52b5
+
+static int mtk_phy_read_page(struct phy_device *phydev)
+{
+	return __phy_read(phydev, MTK_EXT_PAGE_ACCESS);
+}
+
+static int mtk_phy_write_page(struct phy_device *phydev, int page)
+{
+	return __phy_write(phydev, MTK_EXT_PAGE_ACCESS, page);
+}
+
+static void mtk_phy_config_init(struct phy_device *phydev)
+{
+	/* Disable EEE */
+	phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, 0);
+
+	/* Enable HW auto downshift */
+	phy_modify_paged(phydev, MTK_PHY_PAGE_EXTENDED, 0x14, 0, BIT(4));
+
+	/* Increase SlvDPSready time */
+	phy_select_page(phydev, MTK_PHY_PAGE_EXTENDED_52B5);
+	__phy_write(phydev, 0x10, 0xafae);
+	__phy_write(phydev, 0x12, 0x2f);
+	__phy_write(phydev, 0x10, 0x8fae);
+	phy_restore_page(phydev, MTK_PHY_PAGE_STANDARD, 0);
+
+	/* Adjust 100_mse_threshold */
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x123, 0xffff);
+
+	/* Disable mcc */
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0xa6, 0x300);
+}
+
+static int mt7530_phy_config_init(struct phy_device *phydev)
+{
+	mtk_phy_config_init(phydev);
+
+	/* Increase post_update_timer */
+	phy_write_paged(phydev, MTK_PHY_PAGE_EXTENDED_3, 0x11, 0x4b);
+
+	return 0;
+}
+
+static int mt7531_phy_config_init(struct phy_device *phydev)
+{
+	if (phydev->interface != PHY_INTERFACE_MODE_INTERNAL)
+		return -EINVAL;
+
+	mtk_phy_config_init(phydev);
+
+	/* PHY link down power saving enable */
+	phy_set_bits(phydev, 0x17, BIT(4));
+	phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1, 0xc6, 0x300);
+
+	/* Set TX Pair delay selection */
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x13, 0x404);
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x14, 0x404);
+
+	return 0;
+}
+
+static struct phy_driver mtk_phy_driver[] = {
+	{
+		PHY_ID_MATCH_EXACT(0x03a29412),
+		.name		= "MediaTek MT7530 PHY",
+		.config_init	= mt7530_phy_config_init,
+		/* Interrupts are handled by the switch, not the PHY
+		 * itself.
+		 */
+		.config_intr	= genphy_no_config_intr,
+		.handle_interrupt = genphy_handle_interrupt_no_ack,
+		.read_page	= mtk_phy_read_page,
+		.write_page	= mtk_phy_write_page,
+	},
+	{
+		PHY_ID_MATCH_EXACT(0x03a29441),
+		.name		= "MediaTek MT7531 PHY",
+		.config_init	= mt7531_phy_config_init,
+		/* Interrupts are handled by the switch, not the PHY
+		 * itself.
+		 */
+		.config_intr	= genphy_no_config_intr,
+		.handle_interrupt = genphy_handle_interrupt_no_ack,
+		.read_page	= mtk_phy_read_page,
+		.write_page	= mtk_phy_write_page,
+	},
+};
+
+module_phy_driver(mtk_phy_driver);
+
+static struct mdio_device_id __maybe_unused mtk_phy_tbl[] = {
+	{ PHY_ID_MATCH_VENDOR(0x03a29400) },
+	{ }
+};
+
+MODULE_DESCRIPTION("MediaTek switch integrated PHY driver");
+MODULE_AUTHOR("DENG, Qingfang <dqfext@gmail.com>");
+MODULE_LICENSE("GPL");
+
+MODULE_DEVICE_TABLE(mdio, mtk_phy_tbl);
-- 
2.25.1

[RFC v3 net-next 2/4] net: dsa: mt7530: add interrupt support

[DENG Qingfang]

Add support for MT7530 interrupt controller to handle internal PHYs.
In order to assign an IRQ number to each PHY, the registration of MDIO bus
is also done in this driver.

Signed-off-by: DENG Qingfang <dqfext@gmail.com>
---
RFC v2 -> RFC v3:
- Rework IRQ request and free procedure.
- Add irq_set_nested_thread.
- Move mt753x_phy_{read,write} functions.

 drivers/net/dsa/Kconfig  |   1 +
 drivers/net/dsa/mt7530.c | 266 +++++++++++++++++++++++++++++++++++----
 drivers/net/dsa/mt7530.h |  20 ++-
 3 files changed, 258 insertions(+), 29 deletions(-)

diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index a5f1aa911fe2..264384449f09 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -36,6 +36,7 @@ config NET_DSA_LANTIQ_GSWIP
 config NET_DSA_MT7530
 	tristate "MediaTek MT753x and MT7621 Ethernet switch support"
 	select NET_DSA_TAG_MTK
+	select MEDIATEK_PHY
 	help
 	  This enables support for the MediaTek MT7530, MT7531, and MT7621
 	  Ethernet switch chips.
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 2bd1bab71497..da033004a74d 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -10,6 +10,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
+#include <linux/of_irq.h>
 #include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <linux/of_platform.h>
@@ -596,18 +597,14 @@ mt7530_mib_reset(struct dsa_switch *ds)
 	mt7530_write(priv, MT7530_MIB_CCR, CCR_MIB_ACTIVATE);
 }
 
-static int mt7530_phy_read(struct dsa_switch *ds, int port, int regnum)
+static int mt7530_phy_read(struct mt7530_priv *priv, int port, int regnum)
 {
-	struct mt7530_priv *priv = ds->priv;
-
 	return mdiobus_read_nested(priv->bus, port, regnum);
 }
 
-static int mt7530_phy_write(struct dsa_switch *ds, int port, int regnum,
+static int mt7530_phy_write(struct mt7530_priv *priv, int port, int regnum,
 			    u16 val)
 {
-	struct mt7530_priv *priv = ds->priv;
-
 	return mdiobus_write_nested(priv->bus, port, regnum, val);
 }
 
@@ -785,9 +782,8 @@ mt7531_ind_c22_phy_write(struct mt7530_priv *priv, int port, int regnum,
 }
 
 static int
-mt7531_ind_phy_read(struct dsa_switch *ds, int port, int regnum)
+mt7531_ind_phy_read(struct mt7530_priv *priv, int port, int regnum)
 {
-	struct mt7530_priv *priv = ds->priv;
 	int devad;
 	int ret;
 
@@ -803,10 +799,9 @@ mt7531_ind_phy_read(struct dsa_switch *ds, int port, int regnum)
 }
 
 static int
-mt7531_ind_phy_write(struct dsa_switch *ds, int port, int regnum,
+mt7531_ind_phy_write(struct mt7530_priv *priv, int port, int regnum,
 		     u16 data)
 {
-	struct mt7530_priv *priv = ds->priv;
 	int devad;
 	int ret;
 
@@ -822,6 +817,22 @@ mt7531_ind_phy_write(struct dsa_switch *ds, int port, int regnum,
 	return ret;
 }
 
+static int
+mt753x_phy_read(struct mii_bus *bus, int port, int regnum)
+{
+	struct mt7530_priv *priv = bus->priv;
+
+	return priv->info->phy_read(priv, port, regnum);
+}
+
+static int
+mt753x_phy_write(struct mii_bus *bus, int port, int regnum, u16 val)
+{
+	struct mt7530_priv *priv = bus->priv;
+
+	return priv->info->phy_write(priv, port, regnum, val);
+}
+
 static void
 mt7530_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 		   uint8_t *data)
@@ -1828,6 +1839,211 @@ mt7530_setup_gpio(struct mt7530_priv *priv)
 }
 #endif /* CONFIG_GPIOLIB */
 
+static irqreturn_t
+mt7530_irq_thread_fn(int irq, void *dev_id)
+{
+	struct mt7530_priv *priv = dev_id;
+	bool handled = false;
+	u32 val;
+	int p;
+
+	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+	val = mt7530_mii_read(priv, MT7530_SYS_INT_STS);
+	mt7530_mii_write(priv, MT7530_SYS_INT_STS, val);
+	mutex_unlock(&priv->bus->mdio_lock);
+
+	for (p = 0; p < MT7530_NUM_PHYS; p++) {
+		if (BIT(p) & val) {
+			unsigned int irq;
+
+			irq = irq_find_mapping(priv->irq_domain, p);
+			handle_nested_irq(irq);
+			handled = true;
+		}
+	}
+
+	return IRQ_RETVAL(handled);
+}
+
+static void
+mt7530_irq_mask(struct irq_data *d)
+{
+	struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
+
+	priv->irq_enable &= ~BIT(d->hwirq);
+}
+
+static void
+mt7530_irq_unmask(struct irq_data *d)
+{
+	struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
+
+	priv->irq_enable |= BIT(d->hwirq);
+}
+
+static void
+mt7530_irq_bus_lock(struct irq_data *d)
+{
+	struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
+
+	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+}
+
+static void
+mt7530_irq_bus_sync_unlock(struct irq_data *d)
+{
+	struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
+
+	mt7530_mii_write(priv, MT7530_SYS_INT_EN, priv->irq_enable);
+	mutex_unlock(&priv->bus->mdio_lock);
+}
+
+static struct irq_chip mt7530_irq_chip = {
+	.name = KBUILD_MODNAME,
+	.irq_mask = mt7530_irq_mask,
+	.irq_unmask = mt7530_irq_unmask,
+	.irq_bus_lock = mt7530_irq_bus_lock,
+	.irq_bus_sync_unlock = mt7530_irq_bus_sync_unlock,
+};
+
+static int
+mt7530_irq_map(struct irq_domain *domain, unsigned int irq,
+	       irq_hw_number_t hwirq)
+{
+	irq_set_chip_data(irq, domain->host_data);
+	irq_set_chip_and_handler(irq, &mt7530_irq_chip, handle_simple_irq);
+	irq_set_nested_thread(irq, true);
+	irq_set_noprobe(irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops mt7530_irq_domain_ops = {
+	.map = mt7530_irq_map,
+	.xlate = irq_domain_xlate_onecell,
+};
+
+static void
+mt7530_setup_mdio_irq(struct mt7530_priv *priv)
+{
+	struct dsa_switch *ds = priv->ds;
+	int p;
+
+	for (p = 0; p < MT7530_NUM_PHYS; p++) {
+		if (BIT(p) & ds->phys_mii_mask) {
+			unsigned int irq;
+
+			irq = irq_create_mapping(priv->irq_domain, p);
+			ds->slave_mii_bus->irq[p] = irq;
+		}
+	}
+}
+
+static int
+mt7530_setup_irq(struct mt7530_priv *priv)
+{
+	struct device *dev = priv->dev;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	if (!of_property_read_bool(np, "interrupt-controller")) {
+		dev_info(dev, "no interrupt support\n");
+		return 0;
+	}
+
+	priv->irq = of_irq_get(np, 0);
+	if (priv->irq <= 0) {
+		dev_err(dev, "failed to get parent IRQ: %d\n", priv->irq);
+		return priv->irq ? : -EINVAL;
+	}
+
+	priv->irq_domain = irq_domain_add_linear(np, MT7530_NUM_PHYS,
+						&mt7530_irq_domain_ops, priv);
+	if (!priv->irq_domain) {
+		dev_err(dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	/* This register must be set for MT7530 to properly fire interrupts */
+	if (priv->id != ID_MT7531)
+		mt7530_set(priv, MT7530_TOP_SIG_CTRL, TOP_SIG_CTRL_NORMAL);
+
+	ret = request_threaded_irq(priv->irq, NULL, mt7530_irq_thread_fn,
+				   IRQF_ONESHOT, KBUILD_MODNAME, priv);
+	if (ret) {
+		irq_domain_remove(priv->irq_domain);
+		dev_err(dev, "failed to request IRQ: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void
+mt7530_free_mdio_irq(struct mt7530_priv *priv)
+{
+	int p;
+
+	for (p = 0; p < MT7530_NUM_PHYS; p++) {
+		if (BIT(p) & priv->ds->phys_mii_mask) {
+			unsigned int irq;
+
+			irq = irq_find_mapping(priv->irq_domain, p);
+			irq_dispose_mapping(irq);
+		}
+	}
+}
+
+
+static void
+mt7530_free_irq_common(struct mt7530_priv *priv)
+{
+	free_irq(priv->irq, priv);
+	irq_domain_remove(priv->irq_domain);
+}
+
+static void
+mt7530_free_irq(struct mt7530_priv *priv)
+{
+	mt7530_free_mdio_irq(priv);
+	mt7530_free_irq_common(priv);
+}
+
+static int
+mt7530_setup_mdio(struct mt7530_priv *priv)
+{
+	struct dsa_switch *ds = priv->ds;
+	struct device *dev = priv->dev;
+	struct mii_bus *bus;
+	static int idx;
+	int ret;
+
+	bus = devm_mdiobus_alloc(dev);
+	if (!bus)
+		return -ENOMEM;
+
+	ds->slave_mii_bus = bus;
+	bus->priv = priv;
+	bus->name = KBUILD_MODNAME "-mii";
+	snprintf(bus->id, MII_BUS_ID_SIZE, KBUILD_MODNAME "-%d", idx++);
+	bus->read = mt753x_phy_read;
+	bus->write = mt753x_phy_write;
+	bus->parent = dev;
+	bus->phy_mask = ~ds->phys_mii_mask;
+
+	if (priv->irq)
+		mt7530_setup_mdio_irq(priv);
+
+	ret = mdiobus_register(bus);
+	if (ret) {
+		dev_err(dev, "failed to register MDIO bus: %d\n", ret);
+		if (priv->irq)
+			mt7530_free_mdio_irq(priv);
+	}
+
+	return ret;
+}
+
 static int
 mt7530_setup(struct dsa_switch *ds)
 {
@@ -2780,32 +2996,25 @@ static int
 mt753x_setup(struct dsa_switch *ds)
 {
 	struct mt7530_priv *priv = ds->priv;
+	int ret = priv->info->sw_setup(ds);
+	if (ret)
+		return ret;
 
-	return priv->info->sw_setup(ds);
-}
-
-static int
-mt753x_phy_read(struct dsa_switch *ds, int port, int regnum)
-{
-	struct mt7530_priv *priv = ds->priv;
-
-	return priv->info->phy_read(ds, port, regnum);
-}
+	ret = mt7530_setup_irq(priv);
+	if (ret)
+		return ret;
 
-static int
-mt753x_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
-{
-	struct mt7530_priv *priv = ds->priv;
+	ret = mt7530_setup_mdio(priv);
+	if (ret && priv->irq)
+		mt7530_free_irq_common(priv);
 
-	return priv->info->phy_write(ds, port, regnum, val);
+	return ret;
 }
 
 static const struct dsa_switch_ops mt7530_switch_ops = {
 	.get_tag_protocol	= mtk_get_tag_protocol,
 	.setup			= mt753x_setup,
 	.get_strings		= mt7530_get_strings,
-	.phy_read		= mt753x_phy_read,
-	.phy_write		= mt753x_phy_write,
 	.get_ethtool_stats	= mt7530_get_ethtool_stats,
 	.get_sset_count		= mt7530_get_sset_count,
 	.set_ageing_time	= mt7530_set_ageing_time,
@@ -2986,6 +3195,9 @@ mt7530_remove(struct mdio_device *mdiodev)
 		dev_err(priv->dev, "Failed to disable io pwr: %d\n",
 			ret);
 
+	if (priv->irq)
+		mt7530_free_irq(priv);
+
 	dsa_unregister_switch(priv->ds);
 	mutex_destroy(&priv->reg_mutex);
 }
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index ec36ea5dfd57..62fcaabefba1 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -7,6 +7,7 @@
 #define __MT7530_H
 
 #define MT7530_NUM_PORTS		7
+#define MT7530_NUM_PHYS			5
 #define MT7530_CPU_PORT			6
 #define MT7530_NUM_FDB_RECORDS		2048
 #define MT7530_ALL_MEMBERS		0xff
@@ -381,6 +382,12 @@ enum mt7531_sgmii_force_duplex {
 #define  SYS_CTRL_SW_RST		BIT(1)
 #define  SYS_CTRL_REG_RST		BIT(0)
 
+/* Register for system interrupt */
+#define MT7530_SYS_INT_EN		0x7008
+
+/* Register for system interrupt status */
+#define MT7530_SYS_INT_STS		0x700c
+
 /* Register for PHY Indirect Access Control */
 #define MT7531_PHY_IAC			0x701C
 #define  MT7531_PHY_ACS_ST		BIT(31)
@@ -702,6 +709,8 @@ static const char *p5_intf_modes(unsigned int p5_interface)
 	}
 }
 
+struct mt7530_priv;
+
 /* struct mt753x_info -	This is the main data structure for holding the specific
  *			part for each supported device
  * @sw_setup:		Holding the handler to a device initialization
@@ -726,8 +735,8 @@ struct mt753x_info {
 	enum mt753x_id id;
 
 	int (*sw_setup)(struct dsa_switch *ds);
-	int (*phy_read)(struct dsa_switch *ds, int port, int regnum);
-	int (*phy_write)(struct dsa_switch *ds, int port, int regnum, u16 val);
+	int (*phy_read)(struct mt7530_priv *priv, int port, int regnum);
+	int (*phy_write)(struct mt7530_priv *priv, int port, int regnum, u16 val);
 	int (*pad_setup)(struct dsa_switch *ds, phy_interface_t interface);
 	int (*cpu_port_config)(struct dsa_switch *ds, int port);
 	bool (*phy_mode_supported)(struct dsa_switch *ds, int port,
@@ -761,6 +770,10 @@ struct mt753x_info {
  *			registers
  * @p6_interface	Holding the current port 6 interface
  * @p5_intf_sel:	Holding the current port 5 interface select
+ *
+ * @irq:		IRQ number of the switch
+ * @irq_domain:		IRQ domain of the switch irq_chip
+ * @irq_enable:		IRQ enable bits, synced to SYS_INT_EN
  */
 struct mt7530_priv {
 	struct device		*dev;
@@ -782,6 +795,9 @@ struct mt7530_priv {
 	struct mt7530_port	ports[MT7530_NUM_PORTS];
 	/* protect among processes for registers access*/
 	struct mutex reg_mutex;
+	int irq;
+	struct irq_domain *irq_domain;
+	u32 irq_enable;
 };
 
 struct mt7530_hw_vlan_entry {
-- 
2.25.1

[RFC v3 net-next 3/4] dt-bindings: net: dsa: add MT7530 interrupt controller binding

[DENG Qingfang]

Add device tree binding to support MT7530 interrupt controller.

Signed-off-by: DENG Qingfang <dqfext@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
RFC v2 -> RFC v3:
- No changes.

 Documentation/devicetree/bindings/net/dsa/mt7530.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/mt7530.txt b/Documentation/devicetree/bindings/net/dsa/mt7530.txt
index de04626a8e9d..26b34888eb62 100644
--- a/Documentation/devicetree/bindings/net/dsa/mt7530.txt
+++ b/Documentation/devicetree/bindings/net/dsa/mt7530.txt
@@ -81,6 +81,11 @@ Optional properties:
 - gpio-controller: Boolean; if defined, MT7530's LED controller will run on
 	GPIO mode.
 - #gpio-cells: Must be 2 if gpio-controller is defined.
+- interrupt-controller: Boolean; Enables the internal interrupt controller.
+
+If interrupt-controller is defined, the following property is required.
+
+- interrupts: Parent interrupt for the interrupt controller.
 
 See Documentation/devicetree/bindings/net/dsa/dsa.txt for a list of additional
 required, optional properties and how the integrated switch subnodes must
-- 
2.25.1

[RFC v3 net-next 4/4] staging: mt7621-dts: enable MT7530 interrupt controller

[DENG Qingfang]

Enable MT7530 interrupt controller in the MT7621 SoC.

Signed-off-by: DENG Qingfang <dqfext@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
RFC v2 -> RFC v3:
- No changes.

 drivers/staging/mt7621-dts/mt7621.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/mt7621-dts/mt7621.dtsi b/drivers/staging/mt7621-dts/mt7621.dtsi
index 16fc94f65486..ebf8b0633e88 100644
--- a/drivers/staging/mt7621-dts/mt7621.dtsi
+++ b/drivers/staging/mt7621-dts/mt7621.dtsi
@@ -447,6 +447,9 @@ switch0: switch0@0 {
 				mediatek,mcm;
 				resets = <&rstctrl 2>;
 				reset-names = "mcm";
+				interrupt-controller;
+				interrupt-parent = <&gic>;
+				interrupts = <GIC_SHARED 23 IRQ_TYPE_LEVEL_HIGH>;
 
 				ports {
 					#address-cells = <1>;
-- 
2.25.1

Re: [RFC v3 net-next 0/4] MT7530 interrupt support

[René van Dorst]

Quoting DENG Qingfang <dqfext@gmail.com>:

> Add support for MT7530 interrupt controller.
>
> DENG Qingfang (4):
>   net: phy: add MediaTek PHY driver
>   net: dsa: mt7530: add interrupt support
>   dt-bindings: net: dsa: add MT7530 interrupt controller binding
>   staging: mt7621-dts: enable MT7530 interrupt controller
>
>  .../devicetree/bindings/net/dsa/mt7530.txt    |   5 +
>  drivers/net/dsa/Kconfig                       |   1 +
>  drivers/net/dsa/mt7530.c                      | 266 ++++++++++++++++--
>  drivers/net/dsa/mt7530.h                      |  20 +-
>  drivers/net/phy/Kconfig                       |   5 +
>  drivers/net/phy/Makefile                      |   1 +
>  drivers/net/phy/mediatek.c                    | 112 ++++++++
>  drivers/staging/mt7621-dts/mt7621.dtsi        |   3 +
>  8 files changed, 384 insertions(+), 29 deletions(-)
>  create mode 100644 drivers/net/phy/mediatek.c
>
> --
> 2.25.1

I already tested v2 which works fine.
v3 works too.

Tested on Ubiquiti ER-X-SFP (MT7621) with 1 external phy which uses irq=POLL.

See dmesg log:

[   12.045645] mt7530 mdio-bus:1f eth0 (uninitialized): PHY  
[mt7530-0:00] driver [MediaTek MT7530 PHY] (irq=24)
[   12.425643] mt7530 mdio-bus:1f eth1 (uninitialized): PHY  
[mt7530-0:01] driver [MediaTek MT7530 PHY] (irq=25)
[   12.745642] mt7530 mdio-bus:1f eth2 (uninitialized): PHY  
[mt7530-0:02] driver [MediaTek MT7530 PHY] (irq=26)
[   13.065656] mt7530 mdio-bus:1f eth3 (uninitialized): PHY  
[mt7530-0:03] driver [MediaTek MT7530 PHY] (irq=27)
[   13.445657] mt7530 mdio-bus:1f eth4 (uninitialized): PHY  
[mt7530-0:04] driver [MediaTek MT7530 PHY] (irq=28)
[   13.785656] mt7530 mdio-bus:1f eth5 (uninitialized): PHY  
[mdio-bus:07] driver [Qualcomm Atheros AR8031/AR8033] (irq=POLL)

Tested-by: René van Dorst <opensource@vdorst.com>

Greats,

René

Re: [RFC v3 net-next 0/4] MT7530 interrupt support

[DENG Qingfang]

Hi René,

On Thu, Apr 8, 2021 at 10:02 PM René van Dorst <opensource@vdorst.com> wrote:
>
> Tested on Ubiquiti ER-X-SFP (MT7621) with 1 external phy which uses irq=POLL.
>

I wonder if the external PHY's IRQ can be registered in the devicetree.
Change MT7530_NUM_PHYS to 6, and add the following to ER-X-SFP dts PHY node:

interrupt-parent = <&switch0>;
interrupts = <5>;

Re: [RFC v3 net-next 0/4] MT7530 interrupt support

[Andrew Lunn]

On Thu, Apr 08, 2021 at 11:00:08PM +0800, DENG Qingfang wrote:
> Hi René,
> 
> On Thu, Apr 8, 2021 at 10:02 PM René van Dorst <opensource@vdorst.com> wrote:
> >
> > Tested on Ubiquiti ER-X-SFP (MT7621) with 1 external phy which uses irq=POLL.
> >
> 
> I wonder if the external PHY's IRQ can be registered in the devicetree.
> Change MT7530_NUM_PHYS to 6, and add the following to ER-X-SFP dts PHY node:

I don't know this platform. What is the PHYs interrupt pin connected
to? A SoC GPIO? There is a generic mechanism to describe PHY
interrupts in DT. That should be used, if it is a GPIO.

	   Andrew

Re: [RFC v3 net-next 0/4] MT7530 interrupt support

[René van Dorst]

Quoting Andrew Lunn <andrew@lunn.ch>:

> On Thu, Apr 08, 2021 at 11:00:08PM +0800, DENG Qingfang wrote:
>> Hi René,
>>
>> On Thu, Apr 8, 2021 at 10:02 PM René van Dorst  
>> <opensource@vdorst.com> wrote:
>> >
>> > Tested on Ubiquiti ER-X-SFP (MT7621) with 1 external phy which  
>> uses irq=POLL.
>> >
>>
>> I wonder if the external PHY's IRQ can be registered in the devicetree.
>> Change MT7530_NUM_PHYS to 6, and add the following to ER-X-SFP dts PHY node:
>
> I don't know this platform. What is the PHYs interrupt pin connected
> to? A SoC GPIO? There is a generic mechanism to describe PHY
> interrupts in DT. That should be used, if it is a GPIO.
>
> 	   Andrew

Quoting Andrew Lunn <andrew@lunn.ch>:

> On Thu, Apr 08, 2021 at 11:00:08PM +0800, DENG Qingfang wrote:
>> Hi René,
>>
>> On Thu, Apr 8, 2021 at 10:02 PM René van Dorst  
>> <opensource@vdorst.com> wrote:
>> >
>> > Tested on Ubiquiti ER-X-SFP (MT7621) with 1 external phy which  
>> uses irq=POLL.
>> >
>>
>> I wonder if the external PHY's IRQ can be registered in the devicetree.
>> Change MT7530_NUM_PHYS to 6, and add the following to ER-X-SFP dts PHY node:
>
> I don't know this platform. What is the PHYs interrupt pin connected
> to? A SoC GPIO? There is a generic mechanism to describe PHY
> interrupts in DT. That should be used, if it is a GPIO.
>
> 	   Andrew


Hi Andrew,

I couldn't find if the external phy IRQ is connected to any gpio of the SOC.
So External PHY IRQ can't be sensed via a gpio.


The patch used the MT7530 link change interrupt and flags.
Maybe the patch is misusing the these flags as an interrupt?
The same MT7530 register also has the interrupt flags for the internal phys.
But in the MT7531 datasheet they don't describe them.

On the other hand I don't have any information about the internal PHY  
or register settings.
So enabling the interrupt on the PHY is currently not possible.

I also forced enabled all the MT7530 PHY interrupts and PHY link  
change interrupts.
I print the interrupt status mt7530.
I don't see any MT7530 interrupt fired when link changing the port  
5/external phy.
Which was of course as expected. We only have 5 internal phy's for the  
port 0 to 4.
Port 5 and 6 is only have a MAC that is connected to the SOC of an  
external PHY.

Greats,

René