diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/gpio.txt | 5 | ||||
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | Documentation/sound/alsa/ALSA-Configuration.txt | 4 |
3 files changed, 13 insertions, 2 deletions
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: /* set as input or output, returning 0 or negative errno */ int gpio_direction_input(unsigned gpio); - int gpio_direction_output(unsigned gpio); + int gpio_direction_output(unsigned gpio, int value); The return value is zero for success, else a negative errno. It should be checked, since the get/set calls don't have error returns and since misconfiguration is possible. (These calls could sleep.) +For output GPIOs, the value provided becomes the initial output value. +This helps avoid signal glitching during system startup. + Setting the direction can fail if the GPIO number is invalid, or when that particular GPIO can't be used in that mode. It's generally a bad idea to rely on boot firmware to have set the direction correctly, since diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 856c8b114e7..f0b7a5e5740 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -138,6 +138,12 @@ and is between 256 and 4096 characters. It is defined in the file See also Documentation/pm.txt, pci=noacpi + acpi_apic_instance= [ACPI, IOAPIC] + Format: <int> + 2: use 2nd APIC table, if available + 1,0: use 1st APIC table + default: 2 + acpi_sleep= [HW,ACPI] Sleep options Format: { s3_bios, s3_mode } See Documentation/power/video.txt diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index db398a6441c..73e9a174b64 100644 --- a/Documentation/sound/alsa/ALSA-Configuration.txt +++ b/Documentation/sound/alsa/ALSA-Configuration.txt @@ -866,6 +866,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. basic 3-jack (default) hp HP nx6320 thinkpad Lenovo Thinkpad T60/X60/Z60 + toshiba Toshiba U205 AD1986A 6stack 6-jack, separate surrounds (default) @@ -906,7 +907,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. 5stack D945 5stack + SPDIF macmini Intel Mac Mini macbook Intel Mac Book - macbook-pro Intel Mac Book Pro + macbook-pro-v1 Intel Mac Book Pro 1st generation + macbook-pro Intel Mac Book Pro 2nd generation STAC9202/9250/9251 ref Reference board, base config |