arm64: a37xx: pinctrl: Implement gpio_request_enable for gpio functionality
To automatically enable GPIO functionality of some MPP pin, it is required
to implement .gpio_request_enable and .gpio_disable_free callbacks in
pinctrl driver and set .request and .rfree callbacks in GPIO driver to
pinctrl_gpio_request / pinctrl_gpio_free functions.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
index d2abe67..74d9159 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -280,12 +280,13 @@
static int armada_37xx_pmx_set_by_name(struct udevice *dev,
const char *name,
- struct armada_37xx_pin_group *grp)
+ struct armada_37xx_pin_group *grp,
+ bool warn_on_change)
{
struct armada_37xx_pinctrl *info = dev_get_priv(dev);
unsigned int reg = SELECTION;
unsigned int mask = grp->reg_mask;
- int func, val;
+ int func, val, old_func;
dev_dbg(info->dev, "enable function %s group %s\n",
name, grp->name);
@@ -297,6 +298,18 @@
val = grp->val[func];
+ if (warn_on_change && val != (readl(info->base + reg) & mask)) {
+ for (old_func = 0; (old_func < NB_FUNCS) && grp->funcs[old_func]; old_func++) {
+ if (grp->val[old_func] == val)
+ break;
+ }
+ dev_warn(info->dev, "Warning: Changing MPPs %u-%u function from %s to %s...\n",
+ grp->start_pin, grp->start_pin + grp->npins - 1,
+ ((old_func < NB_FUNCS && grp->funcs[old_func]) ?
+ grp->funcs[old_func] : "unknown"),
+ name);
+ }
+
clrsetbits_le32(info->base + reg, mask, val);
return 0;
@@ -310,7 +323,34 @@
struct armada_37xx_pin_group *grp = &info->data->groups[group_selector];
const char *name = info->funcs[func_selector].name;
+ return armada_37xx_pmx_set_by_name(dev, name, grp, false);
+}
+
- return armada_37xx_pmx_set_by_name(dev, name, grp);
+static int armada_37xx_pmx_gpio_request_enable(struct udevice *dev, unsigned int selector)
+{
+ struct armada_37xx_pinctrl *info = dev_get_priv(dev);
+ int ret = -ENOTSUPP;
+ int n;
+
+ /* Find all groups where is requested selector pin and set each group to gpio function */
+ for (n = 0; n < info->data->ngroups; n++) {
+ struct armada_37xx_pin_group *grp = &info->data->groups[n];
+
+ if ((selector >= grp->start_pin && selector < grp->start_pin + grp->npins) ||
+ (selector >= grp->extra_pin && selector < grp->extra_pin + grp->extra_npins)) {
+ ret = armada_37xx_pmx_set_by_name(dev, "gpio", grp, true);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return ret;
+}
+
+static int armada_37xx_pmx_gpio_disable_free(struct udevice *dev, unsigned int selector)
+{
+ /* nothing to do */
+ return 0;
}
/**
@@ -520,6 +560,8 @@
}
static const struct dm_gpio_ops armada_37xx_gpio_ops = {
+ .request = pinctrl_gpio_request,
+ .rfree = pinctrl_gpio_free,
.set_value = armada_37xx_gpio_set,
.get_value = armada_37xx_gpio_get,
.get_function = armada_37xx_gpio_get_direction,
@@ -578,6 +620,8 @@
.get_functions_count = armada_37xx_pmx_get_funcs_count,
.get_function_name = armada_37xx_pmx_get_func_name,
.pinmux_group_set = armada_37xx_pmx_group_set,
+ .gpio_request_enable = armada_37xx_pmx_gpio_request_enable,
+ .gpio_disable_free = armada_37xx_pmx_gpio_disable_free,
.set_state = pinctrl_generic_set_state,
};