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pinctrl: allows not to define the get_group_pins operation
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When using a group only pinctrl driver, which does not have any
information on the pins it is useless to define a get_group_pins
always returning an empty list of pins.

When not using get_group_pin[1], a driver must implement it so
pins = NULL and num_pins = 0. This patch makes it the default
behaviour if not defined in the pinctrl driver when used in
pinmux enable and disable funtions and in pinctrl_groups_show.

It also adds a check in pinctrl_get_group_pins and return -EINVAL if
not defined. This function is called in the gpiolib when adding when
pingroup range. It cannot be used if no group is defined, so this seams
reasonable.

[1] get_group_pin(struct pinctrl_dev *pctldev,
		  unsigned selector,
		  const unsigned **pins,
		  unsigned *num_pins);

Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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atenart authored and linusw committed Apr 22, 2014
1 parent eb171a9 commit e5b3b2d
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Showing 2 changed files with 23 additions and 17 deletions.
17 changes: 10 additions & 7 deletions drivers/pinctrl/core.c
Original file line number Diff line number Diff line change
Expand Up @@ -468,6 +468,9 @@ int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
int gs;

if (!pctlops->get_group_pins)
return -EINVAL;

gs = pinctrl_get_group_selector(pctldev, pin_group);
if (gs < 0)
return gs;
Expand Down Expand Up @@ -1362,15 +1365,16 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)

seq_puts(s, "registered pin groups:\n");
while (selector < ngroups) {
const unsigned *pins;
unsigned num_pins;
const unsigned *pins = NULL;
unsigned num_pins = 0;
const char *gname = ops->get_group_name(pctldev, selector);
const char *pname;
int ret;
int ret = 0;
int i;

ret = ops->get_group_pins(pctldev, selector,
&pins, &num_pins);
if (ops->get_group_pins)
ret = ops->get_group_pins(pctldev, selector,
&pins, &num_pins);
if (ret)
seq_printf(s, "%s [ERROR GETTING PINS]\n",
gname);
Expand Down Expand Up @@ -1694,8 +1698,7 @@ static int pinctrl_check_ops(struct pinctrl_dev *pctldev)

if (!ops ||
!ops->get_groups_count ||
!ops->get_group_name ||
!ops->get_group_pins)
!ops->get_group_name)
return -EINVAL;

if (ops->dt_node_to_map && !ops->dt_free_map)
Expand Down
23 changes: 13 additions & 10 deletions drivers/pinctrl/pinmux.c
Original file line number Diff line number Diff line change
Expand Up @@ -391,14 +391,16 @@ int pinmux_enable_setting(struct pinctrl_setting const *setting)
struct pinctrl_dev *pctldev = setting->pctldev;
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
const struct pinmux_ops *ops = pctldev->desc->pmxops;
int ret;
const unsigned *pins;
unsigned num_pins;
int ret = 0;
const unsigned *pins = NULL;
unsigned num_pins = 0;
int i;
struct pin_desc *desc;

ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
&pins, &num_pins);
if (pctlops->get_group_pins)
ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
&pins, &num_pins);

if (ret) {
const char *gname;

Expand Down Expand Up @@ -470,14 +472,15 @@ void pinmux_disable_setting(struct pinctrl_setting const *setting)
struct pinctrl_dev *pctldev = setting->pctldev;
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
const struct pinmux_ops *ops = pctldev->desc->pmxops;
int ret;
const unsigned *pins;
unsigned num_pins;
int ret = 0;
const unsigned *pins = NULL;
unsigned num_pins = 0;
int i;
struct pin_desc *desc;

ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
&pins, &num_pins);
if (pctlops->get_group_pins)
ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
&pins, &num_pins);
if (ret) {
const char *gname;

Expand Down

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