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Add fdtbus_todr_attach.

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The kernel will only ever use the first RTC driver to call todr_attach.
When drivers use fdtbus_todr_attach, if an "rtc0" alias exists in the
devicetree, ensure that only that device node calls todr_attach.
This commit is contained in:
jmcneill 2017-04-22 13:24:20 +00:00
parent 3f471a638f
commit f57a76a7d7
3 changed files with 65 additions and 2 deletions
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58
sys/dev/fdt/fdt_rtc.c Normal file
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@ -0,0 +1,58 @@
/* $NetBSD: fdt_rtc.c,v 1.1 2017/04/22 13:24:20 jmcneill Exp $ */
/*-
* Copyright (c) 2017 Jared D. McNeill <jmcneill@invisible.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fdt_rtc.c,v 1.1 2017/04/22 13:24:20 jmcneill Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <libfdt.h>
#include <dev/fdt/fdtvar.h>
int
fdtbus_todr_attach(device_t dev, int phandle, todr_chip_handle_t tch)
{
const char *prop;
/*
* The kernel will only use the first device to register with
* todr_attach. If we have an "rtc0" alias, ensure that it matches
* this phandle and ignore all other RTC devices.
*/
prop = fdt_get_alias(fdtbus_get_data(), "rtc0");
if (prop != NULL && OF_finddevice(prop) != phandle) {
device_printf(dev, "disabled\n");
return EINVAL;
}
todr_attach(tch);
return 0;
}

6
sys/dev/fdt/fdtvar.h
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@ -1,4 +1,4 @@
/* $NetBSD: fdtvar.h,v 1.10 2017/04/21 23:35:01 jmcneill Exp $ */
/* $NetBSD: fdtvar.h,v 1.11 2017/04/22 13:24:20 jmcneill Exp $ */
/*-
* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
@ -35,6 +35,8 @@
#include <dev/i2c/i2cvar.h>
#include <dev/clk/clk.h>
#include <dev/clock_subr.h>
#include <dev/ofw/openfirm.h>
struct fdt_attach_args {
@ -159,6 +161,8 @@ void fdtbus_reset_put(struct fdtbus_reset *);
int fdtbus_reset_assert(struct fdtbus_reset *);
int fdtbus_reset_deassert(struct fdtbus_reset *);
int fdtbus_todr_attach(device_t, int, todr_chip_handle_t);
bool fdtbus_set_data(const void *);
const void * fdtbus_get_data(void);
int fdtbus_phandle2offset(int);

3
sys/dev/fdt/files.fdt
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@ -1,4 +1,4 @@
# $NetBSD: files.fdt,v 1.9 2017/04/16 12:29:20 jmcneill Exp $
# $NetBSD: files.fdt,v 1.10 2017/04/22 13:24:20 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@ -30,4 +30,5 @@ file dev/fdt/fdt_i2c.c fdtbus
file dev/fdt/fdt_intr.c fdtbus
file dev/fdt/fdt_regulator.c fdtbus
file dev/fdt/fdt_reset.c fdtbus
file dev/fdt/fdt_rtc.c fdtbus
file dev/fdt/fdt_pinctrl.c fdtbus