diff options
Diffstat (limited to 'Documentation/pinctrl.txt')
| -rw-r--r-- | Documentation/pinctrl.txt | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt index b8f2147b96dd..0df872a41053 100644 --- a/Documentation/pinctrl.txt +++ b/Documentation/pinctrl.txt @@ -72,7 +72,6 @@ static struct pinctrl_desc foo_desc = { .name = "foo", .pins = foo_pins, .npins = ARRAY_SIZE(foo_pins), - .maxpin = 63, .owner = THIS_MODULE, }; @@ -164,8 +163,8 @@ static const char *foo_get_group_name(struct pinctrl_dev *pctldev, } static int foo_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector, - unsigned ** const pins, - unsigned * const num_pins) + const unsigned **pins, + unsigned *num_pins) { *pins = (unsigned *) foo_groups[selector].pins; *num_pins = foo_groups[selector].num_pins; @@ -570,9 +569,8 @@ is possible to perform the requested mux setting, poke the hardware so that this happens. Pinmux drivers are required to supply a few callback functions, some are -optional. Usually the enable() and disable() functions are implemented, -writing values into some certain registers to activate a certain mux setting -for a certain pin. +optional. Usually the set_mux() function is implemented, writing values into +some certain registers to activate a certain mux setting for a certain pin. A simple driver for the above example will work by setting bits 0, 1, 2, 3 or 4 into some register named MUX to select a certain function with a certain @@ -1266,7 +1264,7 @@ The semantics of the pinctrl APIs are: Usually the pin control core handled the get/put pair and call out to the device drivers bookkeeping operations, like checking available functions and -the associated pins, whereas the enable/disable pass on to the pin controller +the associated pins, whereas select_state pass on to the pin controller driver which takes care of activating and/or deactivating the mux setting by quickly poking some registers. @@ -1363,8 +1361,9 @@ function, but with different named in the mapping as described under "Advanced mapping" above. So that for an SPI device, we have two states named "pos-A" and "pos-B". -This snippet first muxes the function in the pins defined by group A, enables -it, disables and releases it, and muxes it in on the pins defined by group B: +This snippet first initializes a state object for both groups (in foo_probe()), +then muxes the function in the pins defined by group A, and finally muxes it in +on the pins defined by group B: #include <linux/pinctrl/consumer.h> |