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| author |   Stephen Warren <swarren@nvidia.com> | 2012-02-22 14:25:58 -0700 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2012-02-24 06:24:52 +0100 |
| commit | 1681f5ae4ca25bddb6f7b6d4f463cc83e3d1ad01 (patch) | |
| tree | fc37580130beadbc5e0898ddb9b5fec32b662859 /Documentation/pinctrl.txt | |
| parent | pinctrl: fix pinconf_groups_show() to emit newline (diff) | |
| download | linux-dev-1681f5ae4ca25bddb6f7b6d4f463cc83e3d1ad01.tar.xz linux-dev-1681f5ae4ca25bddb6f7b6d4f463cc83e3d1ad01.zip | |
pinctrl: disallow map table entries with NULL dev_name field
Hog entries are mapping table entries with .ctrl_dev_name == .dev_name.
All other mapping table entries need .dev_name set so that they will
match some pinctrl_get() call. All extant PIN_MAP*() macros set
.dev_name.
So, there is no reason to allow mapping table entries without .dev_name
set. Update the code and documentation to disallow this.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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: {"map-i2c0", i2c0, pinctrl0, fi2c0, gi2c0} } - Every map must be assigned a symbolic name, pin controller and function. - The group is not compulsory - if it is omitted the first group presented by - the driver as applicable for the function will be selected, which is - useful for simple cases. - - The device name is present in map entries tied to specific devices. Maps - without device names are referred to as SYSTEM pinmuxes, such as can be taken - by the machine implementation on boot and not tied to any specific device. + Every map must be assigned a state name, pin controller, device and + function. The group is not compulsory - if it is omitted the first group + presented by the driver as applicable for the function will be selected, + which is useful for simple cases. It is possible to map several groups to the same combination of device, 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. System pin control hogging ========================== -A system pin control map entry, i.e. a pin control setting that does not have -a device associated with it, can be hogged by the core when the pin controller +Pin control map entries can be hogged by the core when the pin controller is registered. This means that the core will attempt to call pinctrl_get() and pinctrl_enable() on it immediately after the pin control device has been registered. |