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gpio: wm8994: use the new open drain callback 

The WM8994 GPIOs clearly have a dedicated open drain control
register. Implement support for controlling this from GPIO
descriptor tables or other hardware descriptions such as
device tree by implementing the .set_single_ended() callback.

Before this patch, lines requesting open drain will just be
switched to input mode by the framework, thus emulating open
drain. But the hardware can do the real thing, so let's
support that.

As part of this, rename the debugfs string for output mode
from "CMOS" to "push-pull" because it is the term used in
the framework to signify a tomem-pole CMOS output.

Cc: patches@opensource.wolfsonmicro.com
Cc: Mark Brown <broonie@kernel.org>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-04-10 15:07:23 +02:00
parent 51c27da19d
commit 190ea4344b
1 changed files with 24 additions and 1 deletions
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25
drivers/gpio/gpio-wm8994.c
View File

@ -103,6 +103,28 @@ static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
}
static int wm8994_gpio_set_single_ended(struct gpio_chip *chip,
unsigned int offset,
enum single_ended_mode mode)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
struct wm8994 *wm8994 = wm8994_gpio->wm8994;
switch (mode) {
case LINE_MODE_OPEN_DRAIN:
return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
WM8994_GPN_OP_CFG_MASK,
WM8994_GPN_OP_CFG);
case LINE_MODE_PUSH_PULL:
return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
WM8994_GPN_OP_CFG_MASK, 0);
default:
break;
}
return -ENOTSUPP;
}
static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
@ -217,7 +239,7 @@ static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
if (reg & WM8994_GPN_OP_CFG)
seq_printf(s, "open drain ");
else
seq_printf(s, "CMOS ");
seq_printf(s, "push-pull ");
seq_printf(s, "%s (%x)\n",
wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
@ -235,6 +257,7 @@ static struct gpio_chip template_chip = {
.get = wm8994_gpio_get,
.direction_output = wm8994_gpio_direction_out,
.set = wm8994_gpio_set,
.set_single_ended = wm8994_gpio_set_single_ended,
.to_irq = wm8994_gpio_to_irq,
.dbg_show = wm8994_gpio_dbg_show,
.can_sleep = true,