net: ti: am65-cpsw-nuss: Add logic to support MDIO reset
Enhance the AM65 CPSW NUSS driver to perform a MDIO reset using a GPIO
line. Logic is also added to perform a pre and post delay around reset
using the optional 'reset-delay-us' and 'reset-post-delay-us' properties.
This is similar to the reset being performed in the Linux kernel. The
reset is done once when the CPSW MDIO bus is being initialized.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
diff --git a/drivers/net/ti/am65-cpsw-nuss.c b/drivers/net/ti/am65-cpsw-nuss.c
index 456c3eb..f4e5809 100644
--- a/drivers/net/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ti/am65-cpsw-nuss.c
@@ -9,6 +9,7 @@
#include <common.h>
#include <malloc.h>
#include <asm/cache.h>
+#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <clk.h>
@@ -26,6 +27,7 @@
#include <soc.h>
#include <syscon.h>
#include <linux/bitops.h>
+#include <linux/delay.h>
#include <linux/soc/ti/ti-udma.h>
#include "cpsw_mdio.h"
@@ -96,6 +98,8 @@
#define AM65_CPSW_CPPI_PKT_TYPE 0x7
+#define DEFAULT_GPIO_RESET_DELAY 10
+
struct am65_cpsw_port {
fdt_addr_t port_base;
fdt_addr_t port_sgmii_base;
@@ -120,6 +124,10 @@
struct mii_dev *bus;
u32 bus_freq;
+ struct gpio_desc mdio_gpio_reset;
+ u32 reset_delay_us;
+ u32 reset_post_delay_us;
+
struct dma dma_tx;
struct dma dma_rx;
u32 rx_next;
@@ -679,6 +687,16 @@
if (!priv->has_phy || cpsw_common->bus)
return 0;
+ if (IS_ENABLED(CONFIG_DM_GPIO)) {
+ if (dm_gpio_is_valid(&cpsw_common->mdio_gpio_reset)) {
+ dm_gpio_set_value(&cpsw_common->mdio_gpio_reset, 1);
+ udelay(cpsw_common->reset_delay_us);
+ dm_gpio_set_value(&cpsw_common->mdio_gpio_reset, 0);
+ if (cpsw_common->reset_post_delay_us > 0)
+ udelay(cpsw_common->reset_post_delay_us);
+ }
+ }
+
ret = am65_cpsw_mdio_setup(dev);
if (ret)
return ret;
@@ -818,7 +836,7 @@
static int am65_cpsw_probe_nuss(struct udevice *dev)
{
struct am65_cpsw_common *cpsw_common = dev_get_priv(dev);
- ofnode ports_np, node;
+ ofnode ports_np, node, mdio_np;
int ret, i;
struct udevice *port_dev;
@@ -845,6 +863,24 @@
AM65_CPSW_CPSW_NU_ALE_BASE;
cpsw_common->mdio_base = cpsw_common->ss_base + AM65_CPSW_MDIO_BASE;
+ if (IS_ENABLED(CONFIG_DM_GPIO)) {
+ /* get bus level PHY reset GPIO details */
+ mdio_np = dev_read_subnode(dev, "mdio");
+ if (!ofnode_valid(mdio_np)) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ cpsw_common->reset_delay_us = ofnode_read_u32_default(mdio_np, "reset-delay-us",
+ DEFAULT_GPIO_RESET_DELAY);
+ cpsw_common->reset_post_delay_us = ofnode_read_u32_default(mdio_np,
+ "reset-post-delay-us",
+ 0);
+ ret = gpio_request_by_name_nodev(mdio_np, "reset-gpios", 0,
+ &cpsw_common->mdio_gpio_reset,
+ GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+ }
+
ports_np = dev_read_subnode(dev, "ethernet-ports");
if (!ofnode_valid(ports_np)) {
ret = -ENOENT;