[PATCHv4 3/8] rtc: add STM32 RTC driver

[Corentin Labbe]

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 <amelie.delaunay at st.com>
> ---
>  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