Hi Marc,
On 10/06/2015 05:10 PM, Marc Gonzalez wrote:
Date: Tue, 6 Oct 2015 16:49:28 +0200
Subject: [PATCH] clocksource: Sigma Designs Tango 27 MHz xtal
Fix the patch format.
Subject is clocksource/drivers/tango_xtal: Add new timer ...
Sigma Designs Tango platforms provide a 27 MHz crystal oscillator.
Use it for clocksource, sched_clock, and delay_timer.
Signed-off-by: Marc Gonzalez <[email protected]>
---
drivers/clocksource/Makefile | 1 +
drivers/clocksource/tango_xtal.c | 46 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
create mode 100644 drivers/clocksource/tango_xtal.c
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index f228354961ca..46e405673d75 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_ARCH_CLPS711X) += clps711x-timer.o
obj-$(CONFIG_ARCH_ATLAS7) += timer-atlas7.o
obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o
obj-$(CONFIG_ARCH_MXS) += mxs_timer.o
+obj-$(CONFIG_ARCH_TANGOX) += tango_xtal.o
Please use the following scheme:
Add in the clocksource's Kconfig an entry:
config CLKSRC_TANGO_XTAL
bool "bla bla" if COMPILE_TEST
select CLKSRC_OF
and then in the arch's Kconfig:
select CLKSRC_TANGO_XTAL
obj-$(CONFIG_CLKSRC_PXA) += pxa_timer.o
obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o
obj-$(CONFIG_ARCH_U300) += timer-u300.o
diff --git a/drivers/clocksource/tango_xtal.c b/drivers/clocksource/tango_xtal.c
new file mode 100644
index 000000000000..0f2fb293ab75
--- /dev/null
+++ b/drivers/clocksource/tango_xtal.c
@@ -0,0 +1,46 @@
+#include <linux/clocksource.h>
+#include <linux/sched_clock.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
#include <linux/init.h> is missing.
+
+static void __iomem *xtal_in_cnt;
+static struct delay_timer delay_timer;
+
+static unsigned long read_xtal_counter(void)
+{
+ return readl_relaxed(xtal_in_cnt);
+}
+
+static u64 read_sched_clock(void)
+{
+ return read_xtal_counter();
+}
static u64 *notrace* read_sched_clock(void)
+static cycle_t read_clocksource(struct clocksource *cs)
+{
+ return read_xtal_counter();
+}
+
+static struct clocksource tango_xtal = {
+ .name = "tango-xtal",
+ .rating = 350,
+ .read = read_clocksource,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static void __init tango_clocksource_init(struct device_node *np)
+{
+ struct clk *clk = of_clk_get(np, 0);
+ unsigned int xtal_freq = clk_get_rate(clk);
+ xtal_in_cnt = of_iomap(np, 0);
check return code.
+ delay_timer.freq = xtal_freq;
+ delay_timer.read_current_timer = read_xtal_counter;
+ register_current_timer_delay(&delay_timer);
+ sched_clock_register(read_sched_clock, 32, xtal_freq);
+ clocksource_register_hz(&tango_xtal, xtal_freq);
check return code.
+}
+
+CLOCKSOURCE_OF_DECLARE(tango, "sigma,tick-counter", tango_clocksource_init);
--
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