rtc-twlcore.c does initialisation of the msecure gpio pin.
Board files indicate msecure gpio line through twl4030 platform data.
twl4030-core.c passes this information to RTC driver.
Board files does msecure gpio mux configuration.
Signed-off-by: Charulatha V <ch...@ti.com>
---
drivers/rtc/rtc-twl4030.c | 38 +++++++++++++++++++++++++++++++++++++-
1 files changed, 37 insertions(+), 1 deletions(-)
diff --git a/drivers/rtc/rtc-twl4030.c b/drivers/rtc/rtc-twl4030.c
index 9c8c70c..be72253 100644
--- a/drivers/rtc/rtc-twl4030.c
+++ b/drivers/rtc/rtc-twl4030.c
@@ -29,7 +29,7 @@
#include <linux/interrupt.h>
#include <linux/i2c/twl4030.h>
-
+#include <linux/gpio.h>
/*
* RTC block register offsets (use TWL_MODULE_RTC)
@@ -86,6 +86,37 @@
/*----------------------------------------------------------------------*/
/*
+ * msecure line initialisation for TWL4030 RTC registers write access
+ */
+static int msecure_init(struct twl4030_rtc_platform_data *pdata)
+{
+ int ret = 0;
+ if (pdata == NULL)
+ goto out;
+
+ ret = gpio_request(pdata->msecure_gpio, "msecure");
+ if (ret) {
+ pr_err("twl4030_rtc: can't reserve msecure GPIO:%d !\n"
+ "RTC functionality will not be available\n",
+ pdata->msecure_gpio);
+ goto out;
+ }
+ /*
+ * TWL4030 will be in secure mode if msecure line from OMAP is low.
+ * Make msecure line high in order to change the TWL4030 RTC time
+ * and calender registers.
+ */
+ ret = gpio_direction_output(pdata->msecure_gpio, 1);
+ if (ret)
+ pr_err("twl4030_rtc: can't set msecure GPIO direction:%d !\n"
+ "RTC functionality will not be available\n",
+ pdata->msecure_gpio);
+
+out:
+ return ret;
+}
+
+/*
* Supports 1 byte read from TWL4030 RTC register.
*/
static int twl4030_rtc_read_u8(u8 *data, u8 reg)
@@ -390,6 +421,7 @@ static struct rtc_class_ops twl4030_rtc_ops = {
static int __devinit twl4030_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
+ struct twl4030_rtc_platform_data *pdata = pdev->dev.platform_data;
int ret = 0;
int irq = platform_get_irq(pdev, 0);
u8 rd_reg;
@@ -397,6 +429,10 @@ static int __devinit twl4030_rtc_probe(struct
platform_device *pdev)
if (irq <= 0)
return -EINVAL;
+ ret = msecure_init(pdata);
+ if (ret)
+ goto out0;
+
rtc = rtc_device_register(pdev->name,
&pdev->dev, &twl4030_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc)) {
--
1.6.0.4
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