diff options
Diffstat (limited to 'drivers/net/phy/spi_ks8995.c')
| -rw-r--r-- | drivers/net/phy/spi_ks8995.c | 71 |
1 files changed, 62 insertions, 9 deletions
diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c index 5e66d4bd7325..8258c166a767 100644 --- a/drivers/net/phy/spi_ks8995.c +++ b/drivers/net/phy/spi_ks8995.c @@ -18,6 +18,9 @@ #include <linux/module.h> #include <linux/delay.h> #include <linux/device.h> +#include <linux/of.h> +#include <linux/gpio.h> +#include <linux/of_gpio.h> #include <linux/spi/spi.h> @@ -120,7 +123,8 @@ static const struct ks8995_chip_params ks8995_chip[] = { }; struct ks8995_pdata { - /* not yet implemented */ + int reset_gpio; + enum of_gpio_flags reset_gpio_flags; }; struct ks8995_switch { @@ -339,6 +343,24 @@ err_out: return err; } +/* ks8995_parse_dt - setup platform data from devicetree + * @ks: pointer to switch instance + * + * Parses supported DT properties and sets up platform data + * accordingly. + */ +static void ks8995_parse_dt(struct ks8995_switch *ks) +{ + struct device_node *np = ks->spi->dev.of_node; + struct ks8995_pdata *pdata = ks->pdata; + + if (!np) + return; + + pdata->reset_gpio = of_get_named_gpio_flags(np, "reset-gpios", 0, + &pdata->reset_gpio_flags); +} + static const struct bin_attribute ks8995_registers_attr = { .attr = { .name = "registers", @@ -352,14 +374,10 @@ static const struct bin_attribute ks8995_registers_attr = { /* ------------------------------------------------------------------------ */ static int ks8995_probe(struct spi_device *spi) { - struct ks8995_switch *ks; - struct ks8995_pdata *pdata; - int err; + struct ks8995_switch *ks; + int err; int variant = spi_get_device_id(spi)->driver_data; - /* Chip description */ - pdata = spi->dev.platform_data; - if (variant >= max_variant) { dev_err(&spi->dev, "bad chip variant %d\n", variant); return -ENODEV; @@ -370,10 +388,42 @@ static int ks8995_probe(struct spi_device *spi) return -ENOMEM; mutex_init(&ks->lock); - ks->pdata = pdata; ks->spi = spi_dev_get(spi); ks->chip = &ks8995_chip[variant]; + if (ks->spi->dev.of_node) { + ks->pdata = devm_kzalloc(&spi->dev, sizeof(*ks->pdata), + GFP_KERNEL); + if (!ks->pdata) + return -ENOMEM; + + ks->pdata->reset_gpio = -1; + + ks8995_parse_dt(ks); + } + + if (!ks->pdata) + ks->pdata = spi->dev.platform_data; + + /* de-assert switch reset */ + if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio)) { + unsigned long flags; + + flags = (ks->pdata->reset_gpio_flags == OF_GPIO_ACTIVE_LOW ? + GPIOF_ACTIVE_LOW : 0); + + err = devm_gpio_request_one(&spi->dev, + ks->pdata->reset_gpio, + flags, "switch-reset"); + if (err) { + dev_err(&spi->dev, + "failed to get reset-gpios: %d\n", err); + return -EIO; + } + + gpiod_set_value(gpio_to_desc(ks->pdata->reset_gpio), 0); + } + spi_set_drvdata(spi, ks); spi->mode = SPI_MODE_0; @@ -414,11 +464,14 @@ static int ks8995_remove(struct spi_device *spi) sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr); + /* assert reset */ + if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio)) + gpiod_set_value(gpio_to_desc(ks->pdata->reset_gpio), 1); + return 0; } /* ------------------------------------------------------------------------ */ - static struct spi_driver ks8995_driver = { .driver = { .name = "spi-ks8995", |