redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

gpio: tps65218: use the new open drain callback 

The TPS65218 supports open drain mode on its three pins,
with one of them configurable also as push-pull. Use the
new .set_single_ended() callback to set this up properly
from the core, so the core actually see it can drive the
pin(s) as open drain, and does not attempt to emulate
open drain by switching the pin to an input.

Acked-by: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Linus Walleij 2016-04-08 14:13:53 +02:00
parent dfbd379ba9
commit f30e49f129
1 changed files with 35 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/gpio/gpio-tps65218.c
View File

@ -101,16 +101,6 @@ static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
break;
case 1:
/* GP02 is push-pull by default, can be set as open drain. */
if (gpiochip_line_is_open_drain(gc, offset)) {
ret = tps65218_clear_bits(tps65218,
TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_GPO2_BUF,
TPS65218_PROTECT_L1);
if (ret)
return ret;
}
/* Setup GPO2 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_IO1_SEL,
@ -148,6 +138,40 @@ static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
return 0;
}
static int tps65218_gpio_set_single_ended(struct gpio_chip *gc,
unsigned offset,
enum single_ended_mode mode)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
switch (offset) {
case 0:
case 2:
/* GPO1 is hardwired to be open drain */
if (mode == LINE_MODE_OPEN_DRAIN)
return 0;
return -ENOTSUPP;
case 1:
/* GPO2 is push-pull by default, can be set as open drain. */
if (mode == LINE_MODE_OPEN_DRAIN)
return tps65218_clear_bits(tps65218,
TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_GPO2_BUF,
TPS65218_PROTECT_L1);
if (mode == LINE_MODE_PUSH_PULL)
return tps65218_set_bits(tps65218,
TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_GPO2_BUF,
TPS65218_CONFIG1_GPO2_BUF,
TPS65218_PROTECT_L1);
return -ENOTSUPP;
default:
break;
}
return -ENOTSUPP;
}
static struct gpio_chip template_chip = {
.label = "gpio-tps65218",
.owner = THIS_MODULE,
@ -156,6 +180,7 @@ static struct gpio_chip template_chip = {
.direction_input = tps65218_gpio_input,
.get = tps65218_gpio_get,
.set = tps65218_gpio_set,
.set_single_ended = tps65218_gpio_set_single_ended,
.can_sleep = true,
.ngpio = 3,
.base = -1,