diff options
author | Stephen Boyd <sboyd@codeaurora.org> | 2014-05-23 12:57:19 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-05-24 14:03:21 -0400 |
commit | 73fdeb82e963a0e0f7f2781560b43655ab0b40d5 (patch) | |
tree | ea4728e5079e513e830ef655247e47bfa8a54974 /drivers/net/ethernet/micrel | |
parent | c78dbad8c441af4815cd660587470b78552ecfd8 (diff) | |
download | op-kernel-dev-73fdeb82e963a0e0f7f2781560b43655ab0b40d5.zip op-kernel-dev-73fdeb82e963a0e0f7f2781560b43655ab0b40d5.tar.gz |
net: ks8851: Add optional vdd_io regulator and reset gpio
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>
Diffstat (limited to 'drivers/net/ethernet/micrel')
-rw-r--r-- | drivers/net/ethernet/micrel/ks8851.c | 54 |
1 files changed, 53 insertions, 1 deletions
diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c index f2bfc70..3a322da 100644 --- a/drivers/net/ethernet/micrel/ks8851.c +++ b/drivers/net/ethernet/micrel/ks8851.c @@ -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; |