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authorJacopo Mondi <jacopo+renesas@jmondi.org>2017-06-22 12:00:58 +0200
committerLinus Walleij <linus.walleij@linaro.org>2017-06-29 14:30:49 +0200
commit425562429d4f3b134c7390249c23a3f647aad199 (patch)
tree2756f507c79f1bc5806386795121f575ed27ab3d /include/linux/pinctrl
parent61830619675b97d3da34c59c71ae51646a205e2c (diff)
pinctrl: generic: Add output-enable property
Add output-enable generic pin configuration property. This properties allows enabling/disabling pin's output capabilities without actually driving any value on the line. Acked-by: Rob Herring <robh@kernel.org> [Added inline elaborations on buffer enabling/disabling] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/pinctrl')
-rw-r--r--include/linux/pinctrl/pinconf-generic.h15
1 files changed, 11 insertions, 4 deletions
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index 7620eb127cff..231d3075815a 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -73,10 +73,16 @@
* operation, if several modes of operation are supported these can be
* passed in the argument on a custom form, else just use argument 1
* to indicate low power mode, argument 0 turns low power mode off.
- * @PIN_CONFIG_OUTPUT: this will configure the pin as an output. Use argument
- * 1 to indicate high level, argument 0 to indicate low level. (Please
- * see Documentation/pinctrl.txt, section "GPIO mode pitfalls" for a
- * discussion around this parameter.)
+ * @PIN_CONFIG_OUTPUT_ENABLE: this will enable the pin's output mode
+ * without driving a value there. For most platforms this reduces to
+ * enable the output buffers and then let the pin controller current
+ * configuration (eg. the currently selected mux function) drive values on
+ * the line. Use argument 1 to enable output mode, argument 0 to disable
+ * it.
+ * @PIN_CONFIG_OUTPUT: this will configure the pin as an output and drive a
+ * value on the line. Use argument 1 to indicate high level, argument 0 to
+ * indicate low level. (Please see Documentation/pinctrl.txt, section
+ * "GPIO mode pitfalls" for a discussion around this parameter.)
* @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power
* supplies, the argument to this parameter (on a custom format) tells
* the driver which alternative power source to use.
@@ -105,6 +111,7 @@ enum pin_config_param {
PIN_CONFIG_INPUT_SCHMITT,
PIN_CONFIG_INPUT_SCHMITT_ENABLE,
PIN_CONFIG_LOW_POWER_MODE,
+ PIN_CONFIG_OUTPUT_ENABLE,
PIN_CONFIG_OUTPUT,
PIN_CONFIG_POWER_SOURCE,
PIN_CONFIG_SLEW_RATE,