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dm9000: Add regulator and reset support to dm9000 

In boards, the dm9000 chip's power and reset can be controlled by gpio.

It makes sense to add them to the dm9000 driver and let dt be used to
enable power and reset the phy.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zubair Lutfullah Kakakhel 2015-01-15 10:12:26 +00:00 committed by David S. Miller
parent 7eb35b1483
commit 7994fe55a4
2 changed files with 44 additions and 0 deletions
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4
Documentation/devicetree/bindings/net/davicom-dm9000.txt
View File

@ -11,6 +11,8 @@ Required properties:
Optional properties:
- davicom,no-eeprom : Configuration EEPROM is not available
- davicom,ext-phy : Use external PHY
- reset-gpios : phandle of gpio that will be used to reset chip during probe
- vcc-supply : phandle of regulator that will be used to enable power to chip
Example:
@ -21,4 +23,6 @@ Example:
interrupts = <7 4>;
local-mac-address = [00 00 de ad be ef];
davicom,no-eeprom;
reset-gpios = <&gpf 12 GPIO_ACTIVE_LOW>;
vcc-supply = <&eth0_power>;
};

40
drivers/net/ethernet/davicom/dm9000.c
View File

@ -36,6 +36,9 @@
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <asm/delay.h>
#include <asm/irq.h>
@ -1426,11 +1429,48 @@ dm9000_probe(struct platform_device *pdev)
struct dm9000_plat_data *pdata = dev_get_platdata(&pdev->dev);
struct board_info *db; /* Point a board information structure */
struct net_device *ndev;
struct device *dev = &pdev->dev;
const unsigned char *mac_src;
int ret = 0;
int iosize;
int i;
u32 id_val;
int reset_gpios;
enum of_gpio_flags flags;
struct regulator *power;
power = devm_regulator_get(dev, "vcc");
if (IS_ERR(power)) {
if (PTR_ERR(power) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_dbg(dev, "no regulator provided\n");
} else {
ret = regulator_enable(power);
if (ret != 0) {
dev_err(dev,
"Failed to enable power regulator: %d\n", ret);
return ret;
}
dev_dbg(dev, "regulator enabled\n");
}
reset_gpios = of_get_named_gpio_flags(dev->of_node, "reset-gpios", 0,
&flags);
if (gpio_is_valid(reset_gpios)) {
ret = devm_gpio_request_one(dev, reset_gpios, flags,
"dm9000_reset");
if (ret) {
dev_err(dev, "failed to request reset gpio %d: %d\n",
reset_gpios, ret);
return -ENODEV;
}
/* According to manual PWRST# Low Period Min 1ms */
msleep(2);
gpio_set_value(reset_gpios, 1);
/* Needs 3ms to read eeprom when PWRST is deasserted */
msleep(4);
}
if (!pdata) {
pdata = dm9000_parse_dt(&pdev->dev);