Commit a502b343 authored Jul 25, 2019 by Alexandre Torgue Committed by Linus Walleij Aug 05, 2019

pinctrl: stmfx: update pinconf settings



According to the following tab (coming from STMFX datasheet), updates
have to done in stmfx_pinconf_set function:

-"type" has to be set when "bias" is configured as "pull-up or pull-down"
-PIN_CONFIG_DRIVE_PUSH_PULL should only be used when gpio is configured as
 output. There is so no need to check direction.

DIR | TYPE | PUPD | MFX GPIO configuration
----|------|------|---------------------------------------------------
1   | 1    | 1    | OUTPUT open drain with internal pull-up resistor
----|------|------|---------------------------------------------------
1   | 1    | 0    | OUTPUT open drain with internal pull-down resistor
----|------|------|---------------------------------------------------
1   | 0    | 0/1  | OUTPUT push pull no pull
----|------|------|---------------------------------------------------
0   | 1    | 1    | INPUT with internal pull-up resistor
----|------|------|---------------------------------------------------
0   | 1    | 0    | INPUT with internal pull-down resistor
----|------|------|---------------------------------------------------
0   | 0    | 1    | INPUT floating
----|------|------|---------------------------------------------------
0   | 0    | 0    | analog (GPIO not used, default setting)

Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Link: https://lore.kernel.org/r/1564053416-32192-1-git-send-email-amelie.delaunay@st.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

parent 2f22e202

drivers/pinctrl/pinctrl-stmfx.c

+12 −12

Original line number	Original line	Diff line number	Diff line
	@@ -296,28 +296,28 @@ static int stmfx_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
	switch (param) {		switch (param) {
	case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:		case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
	case PIN_CONFIG_BIAS_DISABLE:		case PIN_CONFIG_BIAS_DISABLE:
			case PIN_CONFIG_DRIVE_PUSH_PULL:
			ret = stmfx_pinconf_set_type(pctl, pin, 0);
			if (ret)
			return ret;
			break;
	case PIN_CONFIG_BIAS_PULL_DOWN:		case PIN_CONFIG_BIAS_PULL_DOWN:
			ret = stmfx_pinconf_set_type(pctl, pin, 1);
			if (ret)
			return ret;
	ret = stmfx_pinconf_set_pupd(pctl, pin, 0);		ret = stmfx_pinconf_set_pupd(pctl, pin, 0);
	if (ret)		if (ret)
	return ret;		return ret;
	break;		break;
	case PIN_CONFIG_BIAS_PULL_UP:		case PIN_CONFIG_BIAS_PULL_UP:
	ret = stmfx_pinconf_set_pupd(pctl, pin, 1);		ret = stmfx_pinconf_set_type(pctl, pin, 1);
	if (ret)		if (ret)
	return ret;		return ret;
	break;		ret = stmfx_pinconf_set_pupd(pctl, pin, 1);
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	if (!dir)
	ret = stmfx_pinconf_set_type(pctl, pin, 1);
	else
	ret = stmfx_pinconf_set_type(pctl, pin, 0);
	if (ret)		if (ret)
	return ret;		return ret;
	break;		break;
	case PIN_CONFIG_DRIVE_PUSH_PULL:		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	if (!dir)
	ret = stmfx_pinconf_set_type(pctl, pin, 0);
	else
	ret = stmfx_pinconf_set_type(pctl, pin, 1);		ret = stmfx_pinconf_set_type(pctl, pin, 1);
	if (ret)		if (ret)
	return ret;		return ret;