This patch make the reset pin optionally. Some devices like the atben
from qi-hardware don't have a reset pin externally. The usually way is
to turn power off/on for the atben device to initiate a device reset.
Signed-off-by: Alexander Aring <alex.ar...@gmail.com>
---
drivers/net/ieee802154/at86rf230.c | 34 +++++++++++++++++++++-------------
1 file changed, 21 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ieee802154/at86rf230.c
b/drivers/net/ieee802154/at86rf230.c
index 3744240..47677e3f9 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -1059,9 +1059,11 @@ static int at86rf230_probe(struct spi_device *spi)
return -EINVAL;
}
- rc = gpio_request(pdata->rstn, "rstn");
- if (rc)
- return rc;
+ if (gpio_is_valid(pdata->rstn)) {
+ rc = gpio_request(pdata->rstn, "rstn");
+ if (rc)
+ return rc;
+ }
if (gpio_is_valid(pdata->slp_tr)) {
rc = gpio_request(pdata->slp_tr, "slp_tr");
@@ -1069,9 +1071,11 @@ static int at86rf230_probe(struct spi_device *spi)
goto err_slp_tr;
}
- rc = gpio_direction_output(pdata->rstn, 1);
- if (rc)
- goto err_gpio_dir;
+ if (gpio_is_valid(pdata->rstn)) {
+ rc = gpio_direction_output(pdata->rstn, 1);
+ if (rc)
+ goto err_gpio_dir;
+ }
if (gpio_is_valid(pdata->slp_tr)) {
rc = gpio_direction_output(pdata->slp_tr, 0);
@@ -1080,11 +1084,13 @@ static int at86rf230_probe(struct spi_device *spi)
}
/* Reset */
- udelay(1);
- gpio_set_value(pdata->rstn, 0);
- udelay(1);
- gpio_set_value(pdata->rstn, 1);
- usleep_range(120, 240);
+ if (gpio_is_valid(pdata->rstn)) {
+ udelay(1);
+ gpio_set_value(pdata->rstn, 0);
+ udelay(1);
+ gpio_set_value(pdata->rstn, 1);
+ usleep_range(120, 240);
+ }
rc = __at86rf230_detect_device(spi, &man_id, &part, &version);
if (rc < 0)
@@ -1198,7 +1204,8 @@ err_gpio_dir:
if (gpio_is_valid(pdata->slp_tr))
gpio_free(pdata->slp_tr);
err_slp_tr:
- gpio_free(pdata->rstn);
+ if (gpio_is_valid(pdata->rstn))
+ gpio_free(pdata->rstn);
return rc;
}
@@ -1214,7 +1221,8 @@ static int at86rf230_remove(struct spi_device *spi)
if (gpio_is_valid(pdata->slp_tr))
gpio_free(pdata->slp_tr);
- gpio_free(pdata->rstn);
+ if (gpio_is_valid(pdata->rstn))
+ gpio_free(pdata->rstn);
mutex_destroy(&lp->bmux);
ieee802154_free_device(lp->dev);
--
1.9.0
------------------------------------------------------------------------------
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