Commit 3bcbaf6e authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
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rtc: cmos: Add OF bindings 



This allows to load the OF driver based informations from the device
tree. Systems without BIOS may need to perform some initialization.
PowerPC creates a PNP device from the OF information and performs this
kind of initialization in their private PCI quirk. This looks more
generic.

This patch also avoids registering the platform RTC driver on X86 if
we have a device tree blob. Otherwise we would setup the device based
on the hardcoded information in arch/x86 rather than the device tree
based one.

[ tglx: Changed "int of_have_populated_dt()" to bool as recommended by
        Grant ]

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarDirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Cc: sodaville@linutronix.de
Cc: devicetree-discuss@lists.ozlabs.org
Cc: rtc-linux@googlegroups.com
Cc: Alessandro Zummo <a.zummo@towertech.it>
LKML-Reference: <1298405266-1624-12-git-send-email-bigeasy@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 1fa4163b

Documentation/devicetree/bindings/rtc/rtc-cmos.txt

0 → 100644
+28 −0
Original line number Diff line number Diff line 
 Motorola mc146818 compatible RTC

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Required properties:

  - compatible : "motorola,mc146818"

  - reg : should contain registers location and length.



Optional properties:

  - interrupts : should contain interrupt.

  - interrupt-parent : interrupt source phandle.

  - ctrl-reg : Contains the initial value of the control register also

    called "Register B".

  - freq-reg : Contains the initial value of the frequency register also

    called "Regsiter A".



"Register A" and "B" are usually initialized by the firmware (BIOS for

instance). If this is not done, it can be performed by the driver.



ISA Example:



	rtc@70 {

	         compatible = "motorola,mc146818";

	         interrupts = <8 3>;

	         interrupt-parent = <&ioapic1>;

	         ctrl-reg = <2>;

	         freq-reg = <0x26>;

	         reg = <1 0x70 2>;

	 };

arch/x86/kernel/rtc.c

+3 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#include <linux/acpi.h>

#include <linux/bcd.h>

#include <linux/pnp.h>

#include <linux/of.h>



#include <asm/vsyscall.h>

#include <asm/x86_init.h>
@@ -236,6 +237,8 @@ static __init int add_rtc_cmos(void) 
		}

	}

#endif

	if (of_have_populated_dt())

		return 0;



	platform_device_register(&rtc_device);

	dev_info(&rtc_device.dev,

drivers/rtc/rtc-cmos.c

+45 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ 
#include <linux/mod_devicetable.h>

#include <linux/log2.h>

#include <linux/pm.h>

#include <linux/of.h>

#include <linux/of_platform.h>



/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */

#include <asm-generic/rtc.h>
@@ -1123,6 +1125,47 @@ static struct pnp_driver cmos_pnp_driver = { 


#endif	/* CONFIG_PNP */



#ifdef CONFIG_OF

static const struct of_device_id of_cmos_match[] = {

	{

		.compatible = "motorola,mc146818",

	},

	{ },

};

MODULE_DEVICE_TABLE(of, of_cmos_match);



static __init void cmos_of_init(struct platform_device *pdev)

{

	struct device_node *node = pdev->dev.of_node;

	struct rtc_time time;

	int ret;

	const __be32 *val;



	if (!node)

		return;



	val = of_get_property(node, "ctrl-reg", NULL);

	if (val)

		CMOS_WRITE(be32_to_cpup(val), RTC_CONTROL);



	val = of_get_property(node, "freq-reg", NULL);

	if (val)

		CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT);



	get_rtc_time(&time);

	ret = rtc_valid_tm(&time);

	if (ret) {

		struct rtc_time def_time = {

			.tm_year = 1,

			.tm_mday = 1,

		};

		set_rtc_time(&def_time);

	}

}

#else

static inline void cmos_of_init(struct platform_device *pdev) {}

#define of_cmos_match NULL

#endif

/*----------------------------------------------------------------*/



/* Platform setup should have set up an RTC device, when PNP is
@@ -1131,6 +1174,7 @@ static struct pnp_driver cmos_pnp_driver = { 


static int __init cmos_platform_probe(struct platform_device *pdev)

{

	cmos_of_init(pdev);

	cmos_wake_setup(&pdev->dev);

	return cmos_do_probe(&pdev->dev,

			platform_get_resource(pdev, IORESOURCE_IO, 0),
@@ -1162,6 +1206,7 @@ static struct platform_driver cmos_platform_driver = { 
#ifdef CONFIG_PM

		.pm		= &cmos_pm_ops,

#endif

		.of_match_table = of_cmos_match,

	}

};

include/linux/of.h

+12 −0
Original line number Diff line number Diff line
@@ -70,6 +70,11 @@ extern struct device_node *allnodes; 
extern struct device_node *of_chosen;

extern rwlock_t devtree_lock;



static inline bool of_have_populated_dt(void)

{

	return allnodes != NULL;

}



static inline bool of_node_is_root(const struct device_node *node)

{

	return node && (node->parent == NULL);
@@ -222,5 +227,12 @@ extern void of_attach_node(struct device_node *); 
extern void of_detach_node(struct device_node *);

#endif



#else



static inline bool of_have_populated_dt(void)

{

	return false;

}



#endif /* CONFIG_OF */

#endif /* _LINUX_OF_H */

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