| Message ID | 20161111095036.11803-2-wens@csie.org |
|---|---|
| State | New |
| Headers | show |
On Fri, Nov 11, 2016 at 10:50 AM, Chen-Yu Tsai <wens@csie.org> wrote: > According to pinconf-generic.h, the argument for > PIN_CONFIG_BIAS_PULL_{DOWN,UP} is non-zero if the bias is enabled > with a pull up/down resistor, zero if it is directly connected > to VDD or ground. > > Since Allwinner hardware uses a weak pull resistor internally, > the argument should be 1. > > Signed-off-by: Chen-Yu Tsai <wens@csie.org> > Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Applied this v3 rather than the v2. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c index e199d95af8c0..e04edda8629d 100644 --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c @@ -291,12 +291,16 @@ static unsigned long *sunxi_pctrl_build_pin_config(struct device_node *node, if (sunxi_pctrl_has_bias_prop(node)) { int pull = sunxi_pctrl_parse_bias_prop(node); + int arg = 0; if (pull < 0) { ret = pull; goto err_free; } - pinconfig[idx++] = pinconf_to_config_packed(pull, 0); + if (pull != PIN_CONFIG_BIAS_DISABLE) + arg = 1; /* hardware uses weak pull resistors */ + + pinconfig[idx++] = pinconf_to_config_packed(pull, arg); }
According to pinconf-generic.h, the argument for PIN_CONFIG_BIAS_PULL_{DOWN,UP} is non-zero if the bias is enabled with a pull up/down resistor, zero if it is directly connected to VDD or ground. Since Allwinner hardware uses a weak pull resistor internally, the argument should be 1. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> --- drivers/pinctrl/sunxi/pinctrl-sunxi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)