[PATCH v3 0/4] rtc: add mxc driver for i.MX53 SRTC

[<linux-kernel-dev-QonKdJ6Bx35Wk0Htik3J/w@public.gmane.org>]

From: Patrick Bruenn <p.bruenn-QonKdJ6Bx35Wk0Htik3J/w@public.gmane.org>

Neither rtc-imxdi, rtc-mxc nor rtc-snvs are compatible with i.MX53.

This is driver enables support for the low power domain SRTC features:
- 32-bit MSB of non-rollover time counter
- 32-bit alarm register

Select the new config option RTC_DRV_MXC_V2 to build this driver

Based on:
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/drivers/rtc/rtc-mxc_v2.c?h=imx_2.6.35_11.09.01

Signed-off-by: Patrick Bruenn <p.bruenn-QonKdJ6Bx35Wk0Htik3J/w@public.gmane.org>

---

Open issue:
- naming of the device tree node "rtc" vs. "srtc"

v3:
- introduce new config option with the same patch, which adds the driver
- call rtc_update_irq() only if necessary
- merge mxc_rtc_write_alarm_locked() with mxc_rtc_set_alarm()
- only use clk_enable/disable (without "prepare") during operation
- rebase on v4.15-rc3
- consistently use rtc_tm_to_time64() and time64_t
- refactor mxc_rtc_read_time(): don't lock for readl() only;
  don't rtc_valid_tm(); use time64_t
- check returncode of mxc_rtc_wait_for_flag()
- restructure mxc_rtc_sync_lp_locked() to replace pr_err() with
  dev_err_once(); remove explicit 'inline'
- don't touch imx_v4_v5_defconfig, instead add to imx_v6_v7_defconfig

v2:
- have seperate patches for dt-binding, CONFIG option, imx53.dtsi and driver
- add SPDX-License-Identifier and cleanup copyright notice
- replace __raw_readl/writel() with readl/writel()
- fix PM_SLEEP callbacks
- add CONFIG_RTC_DRV_MXC_V2 to build rtc-mxc_v2.c
- remove misleading or obvious comments and fix style of the remaining
- avoid endless loop while waiting for hw
- implement consistent locking; make spinlock a member of dev struct
- enable clk only for register accesses
- remove all udelay() calls since they are obsolete or redundant
  (we are already waiting for register flags to change)
- init platform_data before registering irq callback
- let set_time() fail, when 32 bit rtc counter exceeded
- make names more consistent
- cleanup and reorder includes
- cleanup and remove unused defines

To: Alessandro Zummo <a.zummo-BfzFCNDTiLLj+vYz1yj4TQ@public.gmane.org>
Cc: Alexandre Belloni <alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org> (maintainer:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
Cc: linux-rtc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org (open list:REAL TIME CLOCK (RTC) SUBSYSTEM)
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org (open list)
Cc: Fabio Estevam <fabio.estevam-3arQi8VN3Tc@public.gmane.org>
Cc: Juergen Borleis <jbe-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: Noel Vellemans <Noel.Vellemans-8UENEgx6w+makBO8gow8eQ@public.gmane.org>
Cc: Shawn Guo <shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> (maintainer:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE)
Cc: Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org> (maintainer:ARM PORT)
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org (moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE)

Cc: Philippe Ombredanne <pombredanne-od1rfyK75/E@public.gmane.org>
Cc: Lothar Waßmann <LW-bxm8fMRDkQLDiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>

Patrick Bruenn (4):
  dt-bindings: rtc: add bindings for i.MX53 SRTC
  ARM: dts: imx53: add srtc node
  rtc: add mxc driver for i.MX53 SRTC
  ARM: imx_v6_v7_defconfig: enable RTC_DRV_MXC_V2

 .../devicetree/bindings/rtc/rtc-mxc_v2.txt         |  17 +
 arch/arm/boot/dts/imx53.dtsi                       |   7 +
 arch/arm/configs/imx_v6_v7_defconfig               |   1 +
 drivers/rtc/Kconfig                                |  10 +
 drivers/rtc/Makefile                               |   1 +
 drivers/rtc/rtc-mxc_v2.c                           | 422 +++++++++++++++++++++
 6 files changed, 458 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/rtc-mxc_v2.txt
 create mode 100644 drivers/rtc/rtc-mxc_v2.c

-- 
2.11.0
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html