[PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: 2021-09-22 15:10:46
The driver only needs the reset GPIO for a very brief period, so instead of using devres and keeping the descriptor pointer inside priv, just use that descriptor inside the sja1105_hw_reset function and then let go of it. Also use gpiod_get_optional while at it, and error out on real errors (bad flags etc). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> --- drivers/net/dsa/sja1105/sja1105.h | 1 - drivers/net/dsa/sja1105/sja1105_main.c | 29 ++++++++++++++++++-------- 2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/net/dsa/sja1105/sja1105.h b/drivers/net/dsa/sja1105/sja1105.h
index b83a5114348c..618c8d6a8be1 100644
--- a/drivers/net/dsa/sja1105/sja1105.h
+++ b/drivers/net/dsa/sja1105/sja1105.h@@ -230,7 +230,6 @@ struct sja1105_private { unsigned long bcast_egress_floods; const struct sja1105_info *info; size_t max_xfer_len; - struct gpio_desc *reset_gpio; struct spi_device *spidev; struct dsa_switch *ds; u16 bridge_pvid[SJA1105_MAX_NUM_PORTS];
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 22f39c35f53f..741e965f6068 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c@@ -27,15 +27,29 @@ #define SJA1105_UNKNOWN_MULTICAST 0x010000000000ull -static void sja1105_hw_reset(struct gpio_desc *gpio, unsigned int pulse_len, - unsigned int startup_delay) +/* Configure the optional reset pin and bring up switch */ +static int sja1105_hw_reset(struct device *dev, unsigned int pulse_len, + unsigned int startup_delay) { + struct gpio_desc *gpio; + + gpio = gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + + if (!gpio) + return 0; + gpiod_set_value_cansleep(gpio, 1); /* Wait for minimum reset pulse length */ msleep(pulse_len); gpiod_set_value_cansleep(gpio, 0); /* Wait until chip is ready after reset */ msleep(startup_delay); + + gpiod_put(gpio); + + return 0; } static void
@@ -3224,17 +3238,14 @@ static int sja1105_probe(struct spi_device *spi) return -EINVAL; } + rc = sja1105_hw_reset(dev, 1, 1); + if (rc) + return rc; + priv = devm_kzalloc(dev, sizeof(struct sja1105_private), GFP_KERNEL); if (!priv) return -ENOMEM; - /* Configure the optional reset pin and bring up switch */ - priv->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); - if (IS_ERR(priv->reset_gpio)) - dev_dbg(dev, "reset-gpios not defined, ignoring\n"); - else - sja1105_hw_reset(priv->reset_gpio, 1, 1); - /* Populate our driver private structure (priv) based on * the device tree node that was probed (spi) */
--
2.25.1