93ab471889
In order to use the RTC CMOS driver, each architecture must register a platform device for the RTC. This creates a function to register the platform device based on the RTC device node and verifies that the RTC port against the hard-coded value in asm/mc146818rtc.h. Signed-off-by: Wade Farnsworth <wfarnsworth@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/*
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* Setup code for PC-style Real-Time Clock.
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*
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* Author: Wade Farnsworth <wfarnsworth@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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#include <asm/prom.h>
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static int __init add_rtc(void)
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{
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struct device_node *np;
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struct platform_device *pd;
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struct resource res;
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int ret;
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np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
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if (!np)
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return -ENODEV;
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ret = of_address_to_resource(np, 0, &res);
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of_node_put(np);
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if (ret)
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return ret;
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/*
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* RTC_PORT(x) is hardcoded in asm/mc146818rtc.h. Verify that the
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* address provided by the device node matches.
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*/
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if (res.start != RTC_PORT(0))
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return -EINVAL;
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pd = platform_device_register_simple("rtc_cmos", -1,
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&res, 1);
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if (IS_ERR(pd))
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return PTR_ERR(pd);
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return 0;
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}
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fs_initcall(add_rtc);
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