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authorLinus Walleij <linus.walleij@linaro.org>2019-01-27 14:06:56 +0100
committerLinus Walleij <linus.walleij@linaro.org>2019-04-23 16:02:14 +0200
commit40df14cc5cc0e7c35366eb70dc2c80dd04cc5fbe (patch)
tree9aa6a3384f34362a6b1602ff3596c7bcfa353857 /drivers/clocksource/timer-ixp4xx.c
parent7c23b0e1d4d32f1d1a96730ff1abb8b6cc681cfc (diff)
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clocksource/drivers/ixp4xx: Add OF initialization support
This adds support for setting up the IXP4xx timer driver from device tree. Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/clocksource/timer-ixp4xx.c')
-rw-r--r--drivers/clocksource/timer-ixp4xx.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/clocksource/timer-ixp4xx.c b/drivers/clocksource/timer-ixp4xx.c
index fa78f80792db..404445bc11ea 100644
--- a/drivers/clocksource/timer-ixp4xx.c
+++ b/drivers/clocksource/timer-ixp4xx.c
@@ -16,6 +16,8 @@
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/delay.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
/* Goes away with OF conversion */
#include <linux/platform_data/timer-ixp4xx.h>
@@ -247,3 +249,36 @@ void __init ixp4xx_timer_setup(resource_size_t timerbase,
ixp4xx_timer_register(base, timer_irq, timer_freq);
}
EXPORT_SYMBOL_GPL(ixp4xx_timer_setup);
+
+#ifdef CONFIG_OF
+static __init int ixp4xx_of_timer_init(struct device_node *np)
+{
+ void __iomem *base;
+ int irq;
+ int ret;
+
+ base = of_iomap(np, 0);
+ if (!base) {
+ pr_crit("IXP4xx: can't remap timer\n");
+ return -ENODEV;
+ }
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (irq <= 0) {
+ pr_err("Can't parse IRQ\n");
+ ret = -EINVAL;
+ goto out_unmap;
+ }
+
+ /* TODO: get some fixed clocks into the device tree */
+ ret = ixp4xx_timer_register(base, irq, 66666000);
+ if (ret)
+ goto out_unmap;
+ return 0;
+
+out_unmap:
+ iounmap(base);
+ return ret;
+}
+TIMER_OF_DECLARE(ixp4xx, "intel,ixp4xx-timer", ixp4xx_of_timer_init);
+#endif