diff options
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/feature-removal-schedule.txt | 8 | ||||
-rw-r--r-- | Documentation/gpio.txt | 5 |
2 files changed, 12 insertions, 1 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index c3b1430cf60..0bc8b0b2e10 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt | |||
@@ -316,3 +316,11 @@ Why: The option/code is | |||
316 | Who: Johannes Berg <johannes@sipsolutions.net> | 316 | Who: Johannes Berg <johannes@sipsolutions.net> |
317 | 317 | ||
318 | --------------------------- | 318 | --------------------------- |
319 | |||
320 | What: i8xx_tco watchdog driver | ||
321 | When: in 2.6.22 | ||
322 | Why: the i8xx_tco watchdog driver has been replaced by the iTCO_wdt | ||
323 | watchdog driver. | ||
324 | Who: Wim Van Sebroeck <wim@iguana.be> | ||
325 | |||
326 | --------------------------- | ||
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 576ce463cf4..989f1130f4f 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt | |||
@@ -105,12 +105,15 @@ setting up a platform_device using the GPIO, is mark its direction: | |||
105 | 105 | ||
106 | /* set as input or output, returning 0 or negative errno */ | 106 | /* set as input or output, returning 0 or negative errno */ |
107 | int gpio_direction_input(unsigned gpio); | 107 | int gpio_direction_input(unsigned gpio); |
108 | int gpio_direction_output(unsigned gpio); | 108 | int gpio_direction_output(unsigned gpio, int value); |
109 | 109 | ||
110 | The return value is zero for success, else a negative errno. It should | 110 | The return value is zero for success, else a negative errno. It should |
111 | be checked, since the get/set calls don't have error returns and since | 111 | be checked, since the get/set calls don't have error returns and since |
112 | misconfiguration is possible. (These calls could sleep.) | 112 | misconfiguration is possible. (These calls could sleep.) |
113 | 113 | ||
114 | For output GPIOs, the value provided becomes the initial output value. | ||
115 | This helps avoid signal glitching during system startup. | ||
116 | |||
114 | Setting the direction can fail if the GPIO number is invalid, or when | 117 | Setting the direction can fail if the GPIO number is invalid, or when |
115 | that particular GPIO can't be used in that mode. It's generally a bad | 118 | that particular GPIO can't be used in that mode. It's generally a bad |
116 | idea to rely on boot firmware to have set the direction correctly, since | 119 | idea to rely on boot firmware to have set the direction correctly, since |