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net: ks8851: Add optional vdd_io regulator and reset gpio

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Allow the ks8851 driver to enable an optional 1.8V vdd_io
regulator and assert the reset pin to the phy if a reset gpio is
present in device tree.

Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Boyd 2014-05-23 12:57:19 -07:00 committed by David S. Miller
parent c78dbad8c4
commit 73fdeb82e9
1 changed files with 53 additions and 1 deletions
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54
drivers/net/ethernet/micrel/ks8851.c
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@ -26,6 +26,8 @@
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include "ks8851.h"
@ -85,6 +87,8 @@ union ks8851_tx_hdr {
* @eeprom_size: Companion eeprom size in Bytes, 0 if no eeprom
* @eeprom: 93CX6 EEPROM state for accessing on-board EEPROM.
* @vdd_reg: Optional regulator supplying the chip
* @vdd_io: Optional digital power supply for IO
* @gpio: Optional reset_n gpio
*
* The @lock ensures that the chip is protected when certain operations are
* in progress. When the read or write packet transfer is in progress, most
@ -133,6 +137,8 @@ struct ks8851_net {
struct eeprom_93cx6 eeprom;
struct regulator *vdd_reg;
struct regulator *vdd_io;
int gpio;
};
static int msg_enable;
@ -1404,6 +1410,7 @@ static int ks8851_probe(struct spi_device *spi)
struct ks8851_net *ks;
int ret;
unsigned cider;
int gpio;
ndev = alloc_etherdev(sizeof(struct ks8851_net));
if (!ndev)
@ -1417,6 +1424,37 @@ static int ks8851_probe(struct spi_device *spi)
ks->spidev = spi;
ks->tx_space = 6144;
gpio = of_get_named_gpio_flags(spi->dev.of_node, "reset-gpios",
0, NULL);
if (gpio == -EPROBE_DEFER) {
ret = gpio;
goto err_gpio;
}
ks->gpio = gpio;
if (gpio_is_valid(gpio)) {
ret = devm_gpio_request_one(&spi->dev, gpio,
GPIOF_OUT_INIT_LOW, "ks8851_rst_n");
if (ret) {
dev_err(&spi->dev, "reset gpio request failed\n");
goto err_gpio;
}
}
ks->vdd_io = devm_regulator_get_optional(&spi->dev, "vdd-io");
if (IS_ERR(ks->vdd_io)) {
ret = PTR_ERR(ks->vdd_io);
if (ret == -EPROBE_DEFER)
goto err_reg_io;
} else {
ret = regulator_enable(ks->vdd_io);
if (ret) {
dev_err(&spi->dev, "regulator vdd_io enable fail: %d\n",
ret);
goto err_reg_io;
}
}
ks->vdd_reg = devm_regulator_get_optional(&spi->dev, "vdd");
if (IS_ERR(ks->vdd_reg)) {
ret = PTR_ERR(ks->vdd_reg);
@ -1425,12 +1463,16 @@ static int ks8851_probe(struct spi_device *spi)
} else {
ret = regulator_enable(ks->vdd_reg);
if (ret) {
dev_err(&spi->dev, "regulator enable fail: %d\n",
dev_err(&spi->dev, "regulator vdd enable fail: %d\n",
ret);
goto err_reg;
}
}
if (gpio_is_valid(gpio)) {
usleep_range(10000, 11000);
gpio_set_value(gpio, 1);
}
mutex_init(&ks->lock);
spin_lock_init(&ks->statelock);
@ -1527,10 +1569,16 @@ err_netdev:
free_irq(ndev->irq, ks);
err_irq:
if (gpio_is_valid(gpio))
gpio_set_value(gpio, 0);
err_id:
if (!IS_ERR(ks->vdd_reg))
regulator_disable(ks->vdd_reg);
err_reg:
if (!IS_ERR(ks->vdd_io))
regulator_disable(ks->vdd_io);
err_reg_io:
err_gpio:
free_netdev(ndev);
return ret;
}
@ -1544,8 +1592,12 @@ static int ks8851_remove(struct spi_device *spi)
unregister_netdev(priv->netdev);
free_irq(spi->irq, priv);
if (gpio_is_valid(priv->gpio))
gpio_set_value(priv->gpio, 0);
if (!IS_ERR(priv->vdd_reg))
regulator_disable(priv->vdd_reg);
if (!IS_ERR(priv->vdd_io))
regulator_disable(priv->vdd_io);
free_netdev(priv->netdev);
return 0;