Merge branch 'stmmac-mdio-compat'

Merge branch 'stmmac-mdio-compat'

Phil Reid says:

====================
stmmac: create of compatible mdio bus for stmacc driver

Provide ability to specify a fixed phy in the device tree and
retain the mdio bus if no phy is found. This is needed where
a dsa is connected via a fixed phy and uses the mdio bus for config.
Fixed ptp ref clock calculatins for the stmmac when ptp ref clock
is running at <= 50Mhz. Also add device tree setting to config
ptp clk source on socfpga platforms.

Changes from V5:
- Restore behaviour of unregister mdio bus when no phys found
  if there is no device tree node create the bus.
- Modify condition to allocate mdio_base_data conditional
  on fixed phy presece as well. Maintains existing behaviour
  in conditions where a fixed phy is not present.

Changes from V4:
- Restore #ifdef CONFIG_OF around setting of reset_gpio.
  Member doesn't exist when this isn't defined.

Changes from V3:
- Use if (IS_ENABLED(CONFIG_OF)) instead of #if.
  Reorder some code to reduce if statements.
- of_mdiobus_register already falls back to mdiobus_register
- Tested on system with CONFIG_OF

Changes from V2:
- Formatting, spaces & lines > 80 chars. Using checkpatch
- Drop PTP register debugfs patch.

Changes from V1:
- Fixed mismatch doc / code for ptp_ref_clk dt node.
- Remove unit address from doc example.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 48 insertions, 19 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index f4518bc2cd28..1e19c8fd8b82 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -439,7 +439,7 @@ struct stmmac_ops {
 /* PTP and HW Timer helpers */
 struct stmmac_hwtimestamp {
 	void (*config_hw_tstamping) (void __iomem *ioaddr, u32 data);
-	void (*config_sub_second_increment) (void __iomem *ioaddr);
+	u32 (*config_sub_second_increment) (void __iomem *ioaddr, u32 clk_rate);
 	int (*init_systime) (void __iomem *ioaddr, u32 sec, u32 nsec);
 	int (*config_addend) (void __iomem *ioaddr, u32 addend);
 	int (*adjust_systime) (void __iomem *ioaddr, u32 sec, u32 nsec,
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
index 401383b252a8..f0d797ab74d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -32,6 +32,7 @@
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK 0x00000003
+#define SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000010
 
 #define EMAC_SPLITTER_CTRL_REG			0x0
 #define EMAC_SPLITTER_CTRL_SPEED_MASK		0x3
@@ -47,6 +48,7 @@ struct socfpga_dwmac {
 	struct regmap *sys_mgr_base_addr;
 	struct reset_control *stmmac_rst;
 	void __iomem *splitter_base;
+	bool f2h_ptp_ref_clk;
 };
 
 static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
@@ -116,6 +118,8 @@ static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *
 		return -EINVAL;
 	}
 
+	dwmac->f2h_ptp_ref_clk = of_property_read_bool(np, "altr,f2h_ptp_ref_clk");
+
 	np_splitter = of_parse_phandle(np, "altr,emac-splitter", 0);
 	if (np_splitter) {
 		if (of_address_to_resource(np_splitter, 0, &res_splitter)) {
@@ -171,6 +175,11 @@ static int socfpga_dwmac_setup(struct socfpga_dwmac *dwmac)
 	ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
 	ctrl |= val << reg_shift;
 
+	if (dwmac->f2h_ptp_ref_clk)
+		ctrl |= SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2);
+	else
+		ctrl &= ~(SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2));
+
 	regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
 	return 0;
 }
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
index 76ad214b4036..a77f68918010 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
@@ -33,22 +33,25 @@ static void stmmac_config_hw_tstamping(void __iomem *ioaddr, u32 data)
 	writel(data, ioaddr + PTP_TCR);
 }
 
-static void stmmac_config_sub_second_increment(void __iomem *ioaddr)
+static u32 stmmac_config_sub_second_increment(void __iomem *ioaddr,
+					      u32 ptp_clock)
 {
 	u32 value = readl(ioaddr + PTP_TCR);
 	unsigned long data;
 
 	/* Convert the ptp_clock to nano second
-	 * formula = (1/ptp_clock) * 1000000000
+	 * formula = (2/ptp_clock) * 1000000000
 	 * where, ptp_clock = 50MHz.
 	 */
-	data = (1000000000ULL / 50000000);
+	data = (2000000000ULL / ptp_clock);
 
 	/* 0.465ns accuracy */
 	if (!(value & PTP_TCR_TSCTRLSSR))
 		data = (data * 1000) / 465;
 
 	writel(data, ioaddr + PTP_SSIR);
+
+	return data;
 }
 
 static int stmmac_init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 0b0fea73a7a7..6d4c33a7f0b4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -53,6 +53,7 @@
 #include "stmmac.h"
 #include <linux/reset.h>
 #include <linux/of_mdio.h>
+#include "dwmac1000.h"
 
 #define STMMAC_ALIGN(x)	L1_CACHE_ALIGN(x)
 
@@ -185,7 +186,7 @@ static void stmmac_clk_csr_set(struct stmmac_priv *priv)
 			priv->clk_csr = STMMAC_CSR_100_150M;
 		else if ((clk_rate >= CSR_F_150M) && (clk_rate < CSR_F_250M))
 			priv->clk_csr = STMMAC_CSR_150_250M;
-		else if ((clk_rate >= CSR_F_250M) && (clk_rate <= CSR_F_300M))
+		else if ((clk_rate >= CSR_F_250M) && (clk_rate < CSR_F_300M))
 			priv->clk_csr = STMMAC_CSR_250_300M;
 	}
 }
@@ -435,6 +436,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 	u32 ts_master_en = 0;
 	u32 ts_event_en = 0;
 	u32 value = 0;
+	u32 sec_inc;
 
 	if (!(priv->dma_cap.time_stamp || priv->adv_ts)) {
 		netdev_alert(priv->dev, "No support for HW time stamping\n");
@@ -598,24 +600,19 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 			 tstamp_all | ptp_v2 | ptp_over_ethernet |
 			 ptp_over_ipv6_udp | ptp_over_ipv4_udp | ts_event_en |
 			 ts_master_en | snap_type_sel);
-
 		priv->hw->ptp->config_hw_tstamping(priv->ioaddr, value);
 
 		/* program Sub Second Increment reg */
-		priv->hw->ptp->config_sub_second_increment(priv->ioaddr);
+		sec_inc = priv->hw->ptp->config_sub_second_increment(
+			priv->ioaddr, priv->clk_ptp_rate);
+		temp = div_u64(1000000000ULL, sec_inc);
 
 		/* calculate default added value:
 		 * formula is :
 		 * addend = (2^32)/freq_div_ratio;
-		 * where, freq_div_ratio = clk_ptp_ref_i/50MHz
-		 * hence, addend = ((2^32) * 50MHz)/clk_ptp_ref_i;
-		 * NOTE: clk_ptp_ref_i should be >= 50MHz to
-		 *       achieve 20ns accuracy.
-		 *
-		 * 2^x * y == (y << x), hence
-		 * 2^32 * 50000000 ==> (50000000 << 32)
+		 * where, freq_div_ratio = 1e9ns/sec_inc
 		 */
-		temp = (u64) (50000000ULL << 32);
+		temp = (u64)(temp << 32);
 		priv->default_addend = div_u64(temp, priv->clk_ptp_rate);
 		priv->hw->ptp->config_addend(priv->ioaddr,
 					     priv->default_addend);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index bba670c42e37..16c85ccd1762 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -29,7 +29,7 @@
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
-
+#include <linux/of_mdio.h>
 #include <asm/io.h>
 
 #include "stmmac.h"
@@ -200,10 +200,29 @@ int stmmac_mdio_register(struct net_device *ndev)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
 	int addr, found;
+	struct device_node *mdio_node = NULL;
+	struct device_node *child_node = NULL;
 
 	if (!mdio_bus_data)
 		return 0;
 
+	if (IS_ENABLED(CONFIG_OF)) {
+		for_each_child_of_node(priv->device->of_node, child_node) {
+			if (of_device_is_compatible(child_node,
+						    "snps,dwmac-mdio")) {
+				mdio_node = child_node;
+				break;
+			}
+		}
+
+		if (mdio_node) {
+			netdev_dbg(ndev, "FOUND MDIO subnode\n");
+		} else {
+			netdev_err(ndev, "NO MDIO subnode\n");
+			return 0;
+		}
+	}
+
 	new_bus = mdiobus_alloc();
 	if (new_bus == NULL)
 		return -ENOMEM;
@@ -231,7 +250,8 @@ int stmmac_mdio_register(struct net_device *ndev)
 	new_bus->irq = irqlist;
 	new_bus->phy_mask = mdio_bus_data->phy_mask;
 	new_bus->parent = priv->device;
-	err = mdiobus_register(new_bus);
+
+	err = of_mdiobus_register(new_bus, mdio_node);
 	if (err != 0) {
 		pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
 		goto bus_register_fail;
@@ -284,7 +304,7 @@ int stmmac_mdio_register(struct net_device *ndev)
 		}
 	}
 
-	if (!found) {
+	if (!found && !mdio_node) {
 		pr_warn("%s: No PHY found\n", ndev->name);
 		mdiobus_unregister(new_bus);
 		mdiobus_free(new_bus);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index d02691ba3d7f..6a52fa18cbf2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -146,7 +146,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 	if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 		dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 
-	if (plat->phy_node || plat->phy_bus_name)
+	if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
 		plat->mdio_bus_data = NULL;
 	else
 		plat->mdio_bus_data =