[PATCH net-next 2/2] net: ethernet: microchip: lan865x: add reset-gpios support
From: Alessandro Zini <hidden>
Date: 2026-09-09 12:54:24
Also in:
linux-devicetree, lkml
Subsystem:
microchip lan8650/1 10base-t1s macphy ethernet driver, networking drivers, the rest · Maintainers:
Parthiban Veerasooran, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Add support for an optional reset GPIO. If specified, assert the hardware reset line for 10 us (datasheet specifies min 5 us) and allow 1 ms settle time for crystal oscillator startup before starting OA TC6 communication. Signed-off-by: Alessandro Zini <redacted> --- .../net/ethernet/microchip/lan865x/lan865x.c | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/net/ethernet/microchip/lan865x/lan865x.c b/drivers/net/ethernet/microchip/lan865x/lan865x.c
index 26a2761332a5a..62abc577be90d 100644
--- a/drivers/net/ethernet/microchip/lan865x/lan865x.c
+++ b/drivers/net/ethernet/microchip/lan865x/lan865x.c@@ -9,6 +9,8 @@ #include <linux/kernel.h> #include <linux/phy.h> #include <linux/oa_tc6.h> +#include <linux/gpio/consumer.h> +#include <linux/delay.h> #define DRV_NAME "lan8650"
@@ -41,6 +43,7 @@ struct lan865x_priv { struct net_device *netdev; struct spi_device *spi; struct oa_tc6 *tc6; + struct gpio_desc *reset_gpio; }; static int lan865x_set_hw_macaddr_low_bytes(struct oa_tc6 *tc6, const u8 *mac)
@@ -346,6 +349,24 @@ static int lan865x_probe(struct spi_device *spi) spi_set_drvdata(spi, priv); INIT_WORK(&priv->multicast_work, lan865x_multicast_work_handler); + priv->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(priv->reset_gpio)) { + ret = dev_err_probe(&spi->dev, PTR_ERR(priv->reset_gpio), + "Failed to get reset GPIO\n"); + goto free_netdev; + } + + if (priv->reset_gpio) { + /* Assert hardware reset for 10 us (datasheet specifies min 5 us) + * and allow 1 ms settle time for crystal oscillator startup. + */ + gpiod_set_value_cansleep(priv->reset_gpio, 1); + fsleep(10); + gpiod_set_value_cansleep(priv->reset_gpio, 0); + fsleep(1000); + } + priv->tc6 = oa_tc6_init(spi, netdev, NULL); if (!priv->tc6) { ret = -ENODEV;
--
2.55.0