[PATCH 4/7] net: phy: spi_ks8995: add support for resetting switch using GPIO
From: Helmut Buchsbaum <hidden>
Date: 2016-02-07 22:39:59
Subsystem:
ethernet phy library, networking drivers, the rest · Maintainers:
Andrew Lunn, Heiner Kallweit, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
When using device tree it is no more possible to reset the PHY at board level. Furthermore, doing in the driver allows to power down the switch when the it is not used any more. The patch introduces a new optional property "reset-gpios" denoting an appropriate GPIO handle, e.g.: reset-gpios = <&gpio0 46 1> Signed-off-by: Helmut Buchsbaum <redacted> --- drivers/net/phy/spi_ks8995.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c
index d50f091..60479c4 100644
--- a/drivers/net/phy/spi_ks8995.c
+++ b/drivers/net/phy/spi_ks8995.c@@ -19,6 +19,8 @@ #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>
@@ -127,6 +129,7 @@ struct ks8995_pdata { int mask; } *settings; int nsettings; + int reset_gpio; }; struct ks8995_switch {
@@ -406,6 +409,8 @@ static int ks8995_parse_dt(struct ks8995_switch *ks) if (!np) return 0; + pdata->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); + /* we have something like: * settings = <0x22 0x80 0xF0>; * ^ ^ ^
@@ -484,6 +489,8 @@ static int ks8995_probe(struct spi_device *spi) if (!ks->pdata) return -ENOMEM; + ks->pdata->reset_gpio = -1; + err = ks8995_parse_dt(ks); if (err) { dev_err(&ks->spi->dev, "bad data DT data\n");
@@ -494,6 +501,18 @@ static int ks8995_probe(struct spi_device *spi) if (!ks->pdata) ks->pdata = spi->dev.platform_data; + if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio)) { + err = devm_gpio_request_one(&spi->dev, + ks->pdata->reset_gpio, + GPIOF_OUT_INIT_HIGH, + "switch-reset"); + if (err) { + dev_err(&spi->dev, + "failed to get reset-gpios: %d\n", err); + return -EIO; + } + } + spi_set_drvdata(spi, ks); spi->mode = SPI_MODE_0;
@@ -534,11 +553,13 @@ static int ks8995_remove(struct spi_device *spi) sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr); + if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio)) + gpio_set_value(ks->pdata->reset_gpio, 0); + return 0; } /* ------------------------------------------------------------------------ */ - static struct spi_driver ks8995_driver = { .driver = { .name = "spi-ks8995",
--
2.1.4