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. Without it we end up with of this devices. It is in this hunk in order to remain bisectable.
Cc: [email protected] Cc: Alessandro Zummo <[email protected]> Cc: [email protected] Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Dirk Brandewie <[email protected]> --- Documentation/devicetree/bindings/rtc/rtc-cmos.txt | 28 ++++++++++++ arch/x86/kernel/rtc.c | 3 + drivers/rtc/rtc-cmos.c | 45 ++++++++++++++++++++ include/linux/of.h | 12 +++++ 4 files changed, 88 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/rtc/rtc-cmos.txt diff --git a/Documentation/devicetree/bindings/rtc/rtc-cmos.txt b/Documentation/devicetree/bindings/rtc/rtc-cmos.txt new file mode 100644 index 0000000..7382989 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/rtc-cmos.txt @@ -0,0 +1,28 @@ + 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>; + }; diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c index 6f39cab..3f2ad26 100644 --- a/arch/x86/kernel/rtc.c +++ b/arch/x86/kernel/rtc.c @@ -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, diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index c7ff8df..159b95e 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -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, } }; diff --git a/include/linux/of.h b/include/linux/of.h index d9dd664..8de7c29 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -70,6 +70,11 @@ extern struct device_node *allnodes; extern struct device_node *of_chosen; extern rwlock_t devtree_lock; +static inline int 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 int of_have_populated_dt(void) +{ + return 0; +} + #endif /* CONFIG_OF */ #endif /* _LINUX_OF_H */ -- 1.7.4 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
