[PATCH net-next v3 2/2] net: mdio: mscc-miim: Handle the switch reset

Herve Codina
2024-06-20T12:01:52Z

The mscc-miim device can be impacted by the switch reset, at least when
this device is part of the LAN966x PCI device.

Handle this newly added (optional) resets property.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/mdio/mdio-mscc-miim.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index c29377c85307..62c47e0dd142 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -19,6 +19,7 @@
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
+#include <linux/reset.h>

#define MSCC_MIIM_REG_STATUS 0x0
#define MSCC_MIIM_STATUS_STAT_PENDING BIT(2)
@@ -271,10 +272,17 @@ static int mscc_miim_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct regmap *mii_regmap, *phy_regmap;
struct device *dev = &pdev->dev;
+ struct reset_control *reset;
struct mscc_miim_dev *miim;
struct mii_bus *bus;
int ret;

+ reset = devm_reset_control_get_optional_shared(dev, "switch");
+ if (IS_ERR(reset))
+ return dev_err_probe(dev, PTR_ERR(reset), "Failed to get reset\n");
+
+ reset_control_reset(reset);
+
mii_regmap = ocelot_regmap_from_resource(pdev, 0,
&mscc_miim_regmap_config);
if (IS_ERR(mii_regmap))
--
2.45.0