@@ -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:
@@ -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;
@@ -50,6 +50,7 @@
#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
@@ -2683,10 +2684,24 @@ 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)
@@ -2763,7 +2778,7 @@ error_hw_init:
error_clk_get:
free_netdev(ndev);
- return NULL;
+ return ERR_PTR(ret);
}
/**
@@ -2787,6 +2802,8 @@ 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);
@@ -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;
@@ -148,9 +148,9 @@ 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) */
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@csie.org> --- Documentation/devicetree/bindings/net/stmmac.txt | 3 +++ 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 ++-- 5 files changed, 27 insertions(+), 5 deletions(-)