pinctrl: pinconf: remove checks on ops->pin_config_get

ops->pin_config_get() is only used in one specific path that will only be taken
for generic pinconf drivers (ops->is_generic == true) when dumping the pinconf
by using debugfs.

By removing the check in pinconf_check_ops(), let's stop pressuring people to
write a pin_config_get() function that will never be used and so will probably
never be tested.

Removing the check in pinconf_pins_show() allows driver to not implement
pin_config_get() but still get a dump of the pinconf in debugfs by implementing
pin_config_dbg_show().

Finally, not implementing pin_config_get() now results in returning -ENOTSUPP
instead of -EINVAL. While this doesn't have any real impact for now, this feels
more right.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index b8fcc38c0d116a97cf2b6f4142b026f8b8f94afb..4187fe58794d7d68807eced6615ac58dc7734b00 100644 (file)
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -28,12 +28,6 @@ int pinconf_check_ops(struct pinctrl_dev *pctldev)
 {
        const struct pinconf_ops *ops = pctldev->desc->confops;
 
-       /* We must be able to read out pin status */
-       if (!ops->pin_config_get && !ops->pin_config_group_get) {
-               dev_err(pctldev->dev,
-                       "pinconf must be able to read out pin status\n");
-               return -EINVAL;
-       }
        /* We have to be able to config the pins in SOME way */
        if (!ops->pin_config_set && !ops->pin_config_group_set) {
                dev_err(pctldev->dev,
@@ -67,9 +61,9 @@ int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
        const struct pinconf_ops *ops = pctldev->desc->confops;
 
        if (!ops || !ops->pin_config_get) {
-               dev_err(pctldev->dev, "cannot get pin configuration, missing "
+               dev_dbg(pctldev->dev, "cannot get pin configuration, missing "
                        "pin_config_get() function in driver\n");
-               return -EINVAL;
+               return -ENOTSUPP;
        }
 
        return ops->pin_config_get(pctldev, pin, config);
@@ -93,10 +87,10 @@ int pin_config_group_get(const char *dev_name, const char *pin_group,
        ops = pctldev->desc->confops;
 
        if (!ops || !ops->pin_config_group_get) {
-               dev_err(pctldev->dev, "cannot get configuration for pin "
+               dev_dbg(pctldev->dev, "cannot get configuration for pin "
                        "group, missing group config get function in "
                        "driver\n");
-               ret = -EINVAL;
+               ret = -ENOTSUPP;
                goto unlock;
        }
 
@@ -305,9 +299,6 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
        const struct pinconf_ops *ops = pctldev->desc->confops;
        unsigned i, pin;
 
-       if (!ops || !ops->pin_config_get)
-               return 0;
-
        seq_puts(s, "Pin config settings per pin\n");
        seq_puts(s, "Format: pin (name): configs\n");
 
@@ -356,9 +347,6 @@ static int pinconf_groups_show(struct seq_file *s, void *what)
        unsigned ngroups = pctlops->get_groups_count(pctldev);
        unsigned selector = 0;
 
-       if (!ops || !ops->pin_config_group_get)
-               return 0;
-
        seq_puts(s, "Pin config settings per pin group\n");
        seq_puts(s, "Format: group (name): configs\n");