diff options
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/driver-model/devres.rst | 14 | ||||
| -rw-r--r-- | Documentation/driver-api/pps.rst | 16 | ||||
| -rw-r--r-- | Documentation/driver-api/pwm.rst | 6 |
3 files changed, 24 insertions, 12 deletions
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index 8be086b3f829..c5f99d834ec5 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -322,10 +322,8 @@ IOMAP devm_platform_ioremap_resource_byname() devm_platform_get_and_ioremap_resource() devm_iounmap() - pcim_iomap() - pcim_iomap_regions() : do request_region() and iomap() on multiple BARs - pcim_iomap_table() : array of mapped addresses indexed by BAR - pcim_iounmap() + + Note: For the PCI devices the specific pcim_*() functions may be used, see below. IRQ devm_free_irq() @@ -392,8 +390,16 @@ PCI devm_pci_alloc_host_bridge() : managed PCI host bridge allocation devm_pci_remap_cfgspace() : ioremap PCI configuration space devm_pci_remap_cfg_resource() : ioremap PCI configuration space resource + pcim_enable_device() : after success, all PCI ops become managed + pcim_iomap() : do iomap() on a single BAR + pcim_iomap_regions() : do request_region() and iomap() on multiple BARs + pcim_iomap_regions_request_all() : do request_region() on all and iomap() on multiple BARs + pcim_iomap_table() : array of mapped addresses indexed by BAR + pcim_iounmap() : do iounmap() on a single BAR + pcim_iounmap_regions() : do iounmap() and release_region() on multiple BARs pcim_pin_device() : keep PCI device enabled after release + pcim_set_mwi() : enable Memory-Write-Invalidate PCI transaction PHY devm_usb_get_phy() diff --git a/Documentation/driver-api/pps.rst b/Documentation/driver-api/pps.rst index 2d6b99766ee8..78dded03e5d8 100644 --- a/Documentation/driver-api/pps.rst +++ b/Documentation/driver-api/pps.rst @@ -200,11 +200,17 @@ Generators Sometimes one needs to be able not only to catch PPS signals but to produce them also. For example, running a distributed simulation, which requires -computers' clock to be synchronized very tightly. One way to do this is to -invent some complicated hardware solutions but it may be neither necessary -nor affordable. The cheap way is to load a PPS generator on one of the -computers (master) and PPS clients on others (slaves), and use very simple -cables to deliver signals using parallel ports, for example. +computers' clock to be synchronized very tightly. + + +Parallel port generator +------------------------ + +One way to do this is to invent some complicated hardware solutions but it +may be neither necessary nor affordable. The cheap way is to load a PPS +generator on one of the computers (master) and PPS clients on others +(slaves), and use very simple cables to deliver signals using parallel +ports, for example. Parallel port cable pinout:: diff --git a/Documentation/driver-api/pwm.rst b/Documentation/driver-api/pwm.rst index 3fdc95f7a1d1..bb264490a87a 100644 --- a/Documentation/driver-api/pwm.rst +++ b/Documentation/driver-api/pwm.rst @@ -111,13 +111,13 @@ channel that was exported. The following properties will then be available: duty_cycle The active time of the PWM signal (read/write). - Value is in nanoseconds and must be less than the period. + Value is in nanoseconds and must be less than or equal to the period. polarity Changes the polarity of the PWM signal (read/write). Writes to this property only work if the PWM chip supports changing - the polarity. The polarity can only be changed if the PWM is not - enabled. Value is the string "normal" or "inversed". + the polarity. + Value is the string "normal" or "inversed". enable Enable/disable the PWM signal (read/write). |