diff options
Diffstat (limited to 'Documentation/pinctrl.txt')
-rw-r--r-- | Documentation/pinctrl.txt | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt index ee3266b948e7..fa9163af34f6 100644 --- a/Documentation/pinctrl.txt +++ b/Documentation/pinctrl.txt | |||
@@ -494,14 +494,10 @@ Definitions: | |||
494 | {"map-i2c0", i2c0, pinctrl0, fi2c0, gi2c0} | 494 | {"map-i2c0", i2c0, pinctrl0, fi2c0, gi2c0} |
495 | } | 495 | } |
496 | 496 | ||
497 | Every map must be assigned a symbolic name, pin controller and function. | 497 | Every map must be assigned a state name, pin controller, device and |
498 | The group is not compulsory - if it is omitted the first group presented by | 498 | function. The group is not compulsory - if it is omitted the first group |
499 | the driver as applicable for the function will be selected, which is | 499 | presented by the driver as applicable for the function will be selected, |
500 | useful for simple cases. | 500 | which is useful for simple cases. |
501 | |||
502 | The device name is present in map entries tied to specific devices. Maps | ||
503 | without device names are referred to as SYSTEM pinmuxes, such as can be taken | ||
504 | by the machine implementation on boot and not tied to any specific device. | ||
505 | 501 | ||
506 | It is possible to map several groups to the same combination of device, | 502 | It is possible to map several groups to the same combination of device, |
507 | pin controller and function. This is for cases where a certain function on | 503 | pin controller and function. This is for cases where a certain function on |
@@ -983,8 +979,7 @@ after this you should be able to see this in the debugfs listing of all pins. | |||
983 | System pin control hogging | 979 | System pin control hogging |
984 | ========================== | 980 | ========================== |
985 | 981 | ||
986 | A system pin control map entry, i.e. a pin control setting that does not have | 982 | Pin control map entries can be hogged by the core when the pin controller |
987 | a device associated with it, can be hogged by the core when the pin controller | ||
988 | is registered. This means that the core will attempt to call pinctrl_get() and | 983 | is registered. This means that the core will attempt to call pinctrl_get() and |
989 | pinctrl_enable() on it immediately after the pin control device has been | 984 | pinctrl_enable() on it immediately after the pin control device has been |
990 | registered. | 985 | registered. |