6b6d6c4437
in the clocks=<...> properties of their FDT data. The clock properties consist of 2-cell tuples, each containing a clock device node reference and a clock number. A clock device driver can register itself as providing this interface, then other drivers can turn the FDT clock node reference into the corresponding device_t so that they can use the interface to query and manipulate their clocks. This provides convenience functions to enable or disable all the clocks listed in the properties for a device, so most drivers will be able to manage their clocks with a single call to fdt_clock_enable_all(dev).
82 lines
2.3 KiB
Objective-C
82 lines
2.3 KiB
Objective-C
#-
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# Copyright (c) 2014 Ian Lepore
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/types.h>
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#
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# This is the interface that fdt_clock drivers provide to other drivers.
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# In this context, clock refers to a clock signal provided to some other
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# hardware component within the system. They are most often found within
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# embedded processors that have on-chip IO controllers.
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#
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INTERFACE fdt_clock;
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HEADER {
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enum {
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FDT_CIFLAG_RUNNING = 0x01,
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};
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struct fdt_clock_info {
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device_t provider;
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uint32_t index;
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const char * name; /* May be "", will not be NULL. */
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uint32_t flags;
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uint64_t frequency; /* In Hz. */
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};
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}
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#
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# Enable the specified clock.
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# Returns 0 on success or a standard errno value.
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#
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METHOD int enable {
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device_t provider;
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int index;
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};
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#
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# Disable the specified clock.
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# Returns 0 on success or a standard errno value.
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#
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METHOD int disable {
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device_t provider;
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int index;
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};
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#
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# Returns information about the current operational state of specified clock.
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#
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METHOD int get_info {
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device_t provider;
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int index;
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struct fdt_clock_info *info;
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};
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