[PATCH net-next v3 2/8] net: stmmac: Add support for optional reset control

[Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>]

The DWMAC has a reset assert line, which is used on some SoCs. Add an
optional reset control to stmmac driver core.

To support reset control deferred probing, this patch changes the driver
probe function to return the actual error, instead of just -EINVAL.

Signed-off-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
---
 Documentation/devicetree/bindings/net/stmmac.txt      |  3 +++
 drivers/net/ethernet/stmicro/stmmac/Kconfig           |  1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac.h          |  2 ++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     | 19 ++++++++++++++++++-
 drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c      |  4 ++--
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c |  4 ++--
 6 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index eba0e5e..d132513 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -30,6 +30,9 @@ Required properties:
 
 Optional properties:
 - mac-address: 6 bytes, mac address
+- resets: Should contain a phandle to the STMMAC reset signal, if any
+- reset-names: Should contain the reset signal name "stmmaceth", if a
+	reset phandle is given
 
 Examples:
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 6e52c0f..b59d1ef 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -5,6 +5,7 @@ config STMMAC_ETH
 	select PHYLIB
 	select CRC32
 	select PTP_1588_CLOCK
+	select RESET_CONTROLLER
 	---help---
 	  This is the driver for the Ethernet IPs are built around a
 	  Synopsys IP Core and only tested on the STMicroelectronics
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 73709e9..c1c141f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -32,6 +32,7 @@
 #include <linux/pci.h>
 #include "common.h"
 #include <linux/ptp_clock_kernel.h>
+#include <linux/reset.h>
 
 struct stmmac_priv {
 	/* Frequently used values are kept adjacent for cache effect */
@@ -91,6 +92,7 @@ struct stmmac_priv {
 	int wolopts;
 	int wol_irq;
 	struct clk *stmmac_clk;
+	struct reset_control *stmmac_rst;
 	int clk_csr;
 	struct timer_list eee_ctrl_timer;
 	int lpi_irq;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 0d2c4cb..0c5c120 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -51,6 +51,7 @@
 #include <linux/net_tstamp.h>
 #include "stmmac_ptp.h"
 #include "stmmac.h"
+#include <linux/reset.h>
 
 #define STMMAC_ALIGN(x)	L1_CACHE_ALIGN(x)
 #define JUMBO_LEN	9000
@@ -2728,10 +2729,24 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
 	if (IS_ERR(priv->stmmac_clk)) {
 		dev_warn(priv->device, "%s: warning: cannot get CSR clock\n",
 			 __func__);
+		ret = PTR_ERR(priv->stmmac_clk);
 		goto error_clk_get;
 	}
 	clk_prepare_enable(priv->stmmac_clk);
 
+	priv->stmmac_rst = devm_reset_control_get(priv->device,
+						  STMMAC_RESOURCE_NAME);
+	if (IS_ERR(priv->stmmac_rst)) {
+		if (PTR_ERR(priv->stmmac_rst) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto error_hw_init;
+		}
+		dev_info(priv->device, "no reset control found\n");
+		priv->stmmac_rst = NULL;
+	}
+	if (priv->stmmac_rst)
+		reset_control_deassert(priv->stmmac_rst);
+
 	/* Init MAC and get the capabilities */
 	ret = stmmac_hw_init(priv);
 	if (ret)
@@ -2808,7 +2823,7 @@ error_hw_init:
 error_clk_get:
 	free_netdev(ndev);
 
-	return NULL;
+	return ERR_PTR(ret);
 }
 
 /**
@@ -2832,6 +2847,8 @@ int stmmac_dvr_remove(struct net_device *ndev)
 		stmmac_mdio_unregister(ndev);
 	netif_carrier_off(ndev);
 	unregister_netdev(ndev);
+	if (priv->stmmac_rst)
+		reset_control_assert(priv->stmmac_rst);
 	clk_disable_unprepare(priv->stmmac_clk);
 	free_netdev(ndev);
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
index 37ba2e0..2916089 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
@@ -100,9 +100,9 @@ static int stmmac_pci_probe(struct pci_dev *pdev,
 	stmmac_default_data();
 
 	priv = stmmac_dvr_probe(&(pdev->dev), &plat_dat, addr);
-	if (!priv) {
+	if (IS_ERR(priv)) {
 		pr_err("%s: main driver probe failed", __func__);
-		ret = -ENODEV;
+		ret = PTR_ERR(priv);
 		goto err_out;
 	}
 	priv->dev->irq = pdev->irq;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 6d0bf22..cc6b89a7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -152,9 +152,9 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
 	}
 
 	priv = stmmac_dvr_probe(&(pdev->dev), plat_dat, addr);
-	if (!priv) {
+	if (IS_ERR(priv)) {
 		pr_err("%s: main driver probe failed", __func__);
-		return -ENODEV;
+		return PTR_ERR(priv);
 	}
 
 	/* Get MAC address if available (DT) */
-- 
1.8.5.2