Hello everyone,
On 07/10/2015 01:09, Daniel Lezcano wrote:
> 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.
OK.
> Subject is clocksource/drivers/tango_xtal: Add new timer ...
OK.
(84583983c319 didn't seem to follow that convention)
>> Sigma Designs Tango platforms provide a 27 MHz crystal oscillator.
>> Use it for clocksource, sched_clock, and delay_timer.
>>
>> Signed-off-by: Marc Gonzalez <marc_gonza...@sigmadesigns.com>
>> ---
>> 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-$(CONFIG_ARCH_TANGOX) += tango_xtal.o
>
> Please use the following scheme:
>
> Add in the clocksource's Kconfig an entry:
>
> config CLKSRC_TANGO_XTAL
> bool "bla bla" if COMPILE_TEST
> select CLKSRC_OF
>
> and then in the arch's Kconfig:
>
> select CLKSRC_TANGO_XTAL
OK.
>> obj-$(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.
For my education: this header is already indirectly included;
The directive should be explicit to prevent breakage in case
other (implicit) includes are reorganized?
>> +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)
What about read_clocksource? and read_xtal_counter?
>> +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.
OK.
>> + 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.
OK.
New patch coming up.
Regards.
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