The DS1307 has a square wave output pin, which can be used to output a
clock signal from the DS1307. Additionally, the DS1308 supports
configuring this pin as an input from an external clock source to
which it should sync itself.
Add support with OF device tree properties to configure these
settings. Supported features are using the clock pin as an output, an
input, the rate of the pin, and if it should be enabled on battery
backup power.
The driver does not check that the selected features are supported by
the clock chip being used. It is the designer's responsibility to
create a valid device tree node; the bootloader does not attempt to be
a device tree validator.
Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
As far as the driver is concerned, it's the same as a 1338. It's too
bad the i2c drivers can't make use of OF compatible properties with a
list of compatible devices.
Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Empirical observations show that configuring INTCN=1, ECLK=0, EGFIL=0,
DOSF=1 on DS1341 put the chip in the mode where it draws the least
amount fo current.
Add code to configure DS1341 in such a way in case Barebox is the last
code that runs on the processor before being shut down.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Check obtianed time for validity before returning it to the caller
the same way other RTC drivers do.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
RTC drivers rely on rtc_valid_tm() in order to make sure that no bogus
values from uninitialized HW registers get passed to the uppper layers.
A somewhat contrived way to reproduce this problem with DS1307 RTC
would be to do the following:
> i2c_write -b <bus> -a <addr> -r 3 0x00
> hwclock
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Several failure paths would result in control being transfered to
'exit' label, so instead of just returning error codes in those cases
we also need to free the memory allocated for 'ds1307'
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Port DS1337 specific bits from corresponding Linux driver and add
small changes needed for DS1341.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This patch adds support for the Abracon ab-rtcmc-32.768khz-eoz9-s3
RTC. The driver can probably support other Abracon RTCs aswell, but this
hasn't been verified.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Some rtcs store the weekday. Make sure it's filled in correctly before
passinf the time to the driver. This is easily done by converting it to
seconds-since-epoch and back to struct rtc_time.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Since 2011 barebox' of_device_id struct uses unsigned long type for data field:
struct of_device_id {
char *compatible;
unsigned long data;
};
Almost always struct of_device_id.data field are used as pointer
and need 'unsigned long' casting.
E.g. see 'git grep -A 4 of_device_id drivers/' output:
drivers/ata/sata-imx.c:static __maybe_unused struct of_device_id imx_sata_dt_ids[] = {
drivers/ata/sata-imx.c- {
drivers/ata/sata-imx.c- .compatible = "fsl,imx6q-ahci",
drivers/ata/sata-imx.c- .data = (unsigned long)&data_imx6,
drivers/ata/sata-imx.c- }, {
Here is of_device_id struct in linux kernel v4.0:
struct of_device_id {
char name[32];
char type[32];
char compatible[128];
const void *data;
};
Changing of_device_id.data type to 'const void *data' will increase
barebox' linux kernel compatibility and decrease number of 'unsigned
long' casts.
Part of the patch was done using the 'coccinelle' tool with the
following semantic patch:
@rule1@
identifier dev;
identifier type;
identifier func;
@@
func(...) {
<...
- dev_get_drvdata(dev, (unsigned long *)&type)
+ dev_get_drvdata(dev, (const void **)&type)
...>
}
@rule2@
identifier dev;
identifier type;
identifier func;
identifier data;
@@
func(...) {
<...
- dev_get_drvdata(dev, (unsigned long *)&type->data)
+ dev_get_drvdata(dev, (const void **)&type->data)
...>
}
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Add support for the RTC unit on Ingenic JZ4740, JZ475x and JZ477x SoCs.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Current ds1307 rtc driver supports only ds1307 and ds1338 chips;
it has no nvram support at the moment.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Trent Piepho
Andrey Smirnov
Sascha Hauer
Antony Pavlov
Lucas Stach
Sascha Hauer