On Wed, Jan 11, 2017 at 01:48:25PM +0100, Amelie Delaunay wrote:

This patch adds support for the STM32 RTC.

Signed-off-by: Amelie Delaunay <redacted>
---
 drivers/rtc/Kconfig     |  11 +
 drivers/rtc/Makefile    |   1 +
 drivers/rtc/rtc-stm32.c | 727 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 739 insertions(+)
 create mode 100644 drivers/rtc/rtc-stm32.c

[...]

+/* STM32_PWR_CR */
+#define PWR_CR				0x00
+/* STM32_PWR_CR bit field */
+#define PWR_CR_DBP			BIT(8)
+
+static struct regmap *dbp;

Hello

Why using a global static struct ?
You could alloc a private structure in probe for storing it and use platform_set_drvdata()

Regards