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Date: Tue, 24 Oct 2023 17:58:04 -0300
From: Luiz Angelo Daros de Luca <luizluca@...il.com>
To: netdev@...r.kernel.org
Cc: linus.walleij@...aro.org,
alsi@...g-olufsen.dk,
andrew@...n.ch,
vivien.didelot@...il.com,
f.fainelli@...il.com,
olteanv@...il.com,
davem@...emloft.net,
kuba@...nel.org,
pabeni@...hat.com,
robh+dt@...nel.org,
krzk+dt@...nel.org,
arinc.unal@...nc9.com,
Luiz Angelo Daros de Luca <luizluca@...il.com>
Subject: [PATCH net-next 1/2] net: dsa: realtek: support reset controller
The 'reset-gpios' will not work when the switch reset is controlled by a
reset controller.
Although the reset is optional and the driver performs a soft reset
during setup, if the initial reset state was asserted, the driver will
not detect it.
This is an example of how to use the reset controller:
switch {
compatible = "realtek,rtl8366rb";
resets = <&rst 8>;
reset-names = "switch";
...
}
The reset controller will take precedence over the reset GPIO.
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
---
drivers/net/dsa/realtek/realtek-mdio.c | 36 +++++++++++++++++++++-----
drivers/net/dsa/realtek/realtek-smi.c | 34 +++++++++++++++++++-----
drivers/net/dsa/realtek/realtek.h | 6 +++++
3 files changed, 63 insertions(+), 13 deletions(-)
diff --git a/drivers/net/dsa/realtek/realtek-mdio.c b/drivers/net/dsa/realtek/realtek-mdio.c
index 292e6d087e8b..600124c58c00 100644
--- a/drivers/net/dsa/realtek/realtek-mdio.c
+++ b/drivers/net/dsa/realtek/realtek-mdio.c
@@ -140,6 +140,23 @@ static const struct regmap_config realtek_mdio_nolock_regmap_config = {
.disable_locking = true,
};
+static int realtek_mdio_hwreset(struct realtek_priv *priv, bool active)
+{
+#ifdef CONFIG_RESET_CONTROLLER
+ if (priv->reset_ctl) {
+ if (active)
+ return reset_control_assert(priv->reset_ctl);
+ else
+ return reset_control_deassert(priv->reset_ctl);
+ }
+#endif
+
+ if (priv->reset)
+ gpiod_set_value(priv->reset, active);
+
+ return 0;
+}
+
static int realtek_mdio_probe(struct mdio_device *mdiodev)
{
struct realtek_priv *priv;
@@ -194,20 +211,26 @@ static int realtek_mdio_probe(struct mdio_device *mdiodev)
dev_set_drvdata(dev, priv);
- /* TODO: if power is software controlled, set up any regulators here */
priv->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");
+#ifdef CONFIG_RESET_CONTROLLER
+ priv->reset_ctl = devm_reset_control_get(dev, "switch");
+ if (IS_ERR(priv->reset_ctl)) {
+ dev_err(dev, "failed to get switch reset control\n");
+ return PTR_ERR(priv->reset_ctl);
+ }
+#endif
+
priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(priv->reset)) {
dev_err(dev, "failed to get RESET GPIO\n");
return PTR_ERR(priv->reset);
}
-
- if (priv->reset) {
- gpiod_set_value(priv->reset, 1);
+ if (priv->reset_ctl || priv->reset) {
+ realtek_mdio_hwreset(priv, 1);
dev_dbg(dev, "asserted RESET\n");
msleep(REALTEK_HW_STOP_DELAY);
- gpiod_set_value(priv->reset, 0);
+ realtek_mdio_hwreset(priv, 0);
msleep(REALTEK_HW_START_DELAY);
dev_dbg(dev, "deasserted RESET\n");
}
@@ -246,8 +269,7 @@ static void realtek_mdio_remove(struct mdio_device *mdiodev)
dsa_unregister_switch(priv->ds);
/* leave the device reset asserted */
- if (priv->reset)
- gpiod_set_value(priv->reset, 1);
+ realtek_mdio_hwreset(priv, 1);
}
static void realtek_mdio_shutdown(struct mdio_device *mdiodev)
diff --git a/drivers/net/dsa/realtek/realtek-smi.c b/drivers/net/dsa/realtek/realtek-smi.c
index bfd11591faf4..751159d71223 100644
--- a/drivers/net/dsa/realtek/realtek-smi.c
+++ b/drivers/net/dsa/realtek/realtek-smi.c
@@ -408,6 +408,23 @@ static int realtek_smi_setup_mdio(struct dsa_switch *ds)
return ret;
}
+static int realtek_smi_hwreset(struct realtek_priv *priv, bool active)
+{
+#ifdef CONFIG_RESET_CONTROLLER
+ if (priv->reset_ctl) {
+ if (active)
+ return reset_control_assert(priv->reset_ctl);
+ else
+ return reset_control_deassert(priv->reset_ctl);
+ }
+#endif
+
+ if (priv->reset)
+ gpiod_set_value(priv->reset, active);
+
+ return 0;
+}
+
static int realtek_smi_probe(struct platform_device *pdev)
{
const struct realtek_variant *var;
@@ -457,18 +474,24 @@ static int realtek_smi_probe(struct platform_device *pdev)
dev_set_drvdata(dev, priv);
spin_lock_init(&priv->lock);
- /* TODO: if power is software controlled, set up any regulators here */
+#ifdef CONFIG_RESET_CONTROLLER
+ priv->reset_ctl = devm_reset_control_get(dev, "switch");
+ if (IS_ERR(priv->reset_ctl)) {
+ dev_err(dev, "failed to get switch reset control\n");
+ return PTR_ERR(priv->reset_ctl);
+ }
+#endif
priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(priv->reset)) {
dev_err(dev, "failed to get RESET GPIO\n");
return PTR_ERR(priv->reset);
}
- if (priv->reset) {
- gpiod_set_value(priv->reset, 1);
+ if (priv->reset_ctl || priv->reset) {
+ realtek_smi_hwreset(priv, 1);
dev_dbg(dev, "asserted RESET\n");
msleep(REALTEK_HW_STOP_DELAY);
- gpiod_set_value(priv->reset, 0);
+ realtek_smi_hwreset(priv, 0);
msleep(REALTEK_HW_START_DELAY);
dev_dbg(dev, "deasserted RESET\n");
}
@@ -518,8 +541,7 @@ static void realtek_smi_remove(struct platform_device *pdev)
of_node_put(priv->slave_mii_bus->dev.of_node);
/* leave the device reset asserted */
- if (priv->reset)
- gpiod_set_value(priv->reset, 1);
+ realtek_smi_hwreset(priv, 1);
}
static void realtek_smi_shutdown(struct platform_device *pdev)
diff --git a/drivers/net/dsa/realtek/realtek.h b/drivers/net/dsa/realtek/realtek.h
index 4fa7c6ba874a..ad61e5c13f96 100644
--- a/drivers/net/dsa/realtek/realtek.h
+++ b/drivers/net/dsa/realtek/realtek.h
@@ -12,6 +12,9 @@
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <net/dsa.h>
+#ifdef CONFIG_RESET_CONTROLLER
+#include <linux/reset.h>
+#endif
#define REALTEK_HW_STOP_DELAY 25 /* msecs */
#define REALTEK_HW_START_DELAY 100 /* msecs */
@@ -48,6 +51,9 @@ struct rtl8366_vlan_4k {
struct realtek_priv {
struct device *dev;
+#ifdef CONFIG_RESET_CONTROLLER
+ struct reset_control *reset_ctl;
+#endif
struct gpio_desc *reset;
struct gpio_desc *mdc;
struct gpio_desc *mdio;
--
2.42.0
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