From 36934cac7aaffaf11cb8fad1e828dd61708d9b89 Mon Sep 17 00:00:00 2001 From: Alexandru Tachici Date: Wed, 19 Oct 2022 20:13:13 +0300 Subject: [PATCH] net: ethernet: adi: adin1110: add reset GPIO Add an optional GPIO to be used for a hardware reset of the IC. Signed-off-by: Alexandru Tachici Signed-off-by: David S. Miller --- drivers/net/ethernet/adi/adin1110.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/net/ethernet/adi/adin1110.c b/drivers/net/ethernet/adi/adin1110.c index 086aa9c96b31d..1c0015b55993b 100644 --- a/drivers/net/ethernet/adi/adin1110.c +++ b/drivers/net/ethernet/adi/adin1110.c @@ -1082,9 +1082,30 @@ static void adin1110_adjust_link(struct net_device *dev) */ static int adin1110_check_spi(struct adin1110_priv *priv) { + struct gpio_desc *reset_gpio; int ret; u32 val; + reset_gpio = devm_gpiod_get_optional(&priv->spidev->dev, "reset", + GPIOD_OUT_LOW); + if (reset_gpio) { + /* MISO pin is used for internal configuration, can't have + * anyone else disturbing the SDO line. + */ + spi_bus_lock(priv->spidev->controller); + + gpiod_set_value(reset_gpio, 1); + fsleep(10000); + gpiod_set_value(reset_gpio, 0); + + /* Need to wait 90 ms before interacting with + * the MAC after a HW reset. + */ + fsleep(90000); + + spi_bus_unlock(priv->spidev->controller); + } + ret = adin1110_read_reg(priv, ADIN1110_PHY_ID, &val); if (ret < 0) return ret;