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at86rf230: make reset pin optionally 

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.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Aring 2014-03-15 09:29:06 +01:00 committed by David S. Miller
parent 56f023fbe8
commit 3fa2757124
1 changed files with 21 additions and 13 deletions
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34
drivers/net/ieee802154/at86rf230.c
View File

@ -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);