[PATCH v4 0/4] rtc: add mxc driver for i.MX53 SRTC

From: linux-kernel-dev
Date: Mon Dec 18 2017 - 06:51:51 EST

From: Patrick Bruenn <p.bruenn@xxxxxxxxxxxx>

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:

Signed-off-by: Patrick Bruenn <p.bruenn@xxxxxxxxxxxx>


- rename "srtc" node into generic "rtc" keep the label as "srtc" to avoid
duplication with imx53-m53.dtsi
- fix Signed-off-by: in bindings-patch

- 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

- 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

Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx> (maintainer:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
Cc: linux-rtc@xxxxxxxxxxxxxxx (open list:REAL TIME CLOCK (RTC) SUBSYSTEM)
Cc: devicetree@xxxxxxxxxxxxxxx (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
Cc: linux-kernel@xxxxxxxxxxxxxxx (open list)
Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
Cc: Juergen Borleis <jbe@xxxxxxxxxxxxxx>
Cc: Noel Vellemans <Noel.Vellemans@xxxxxxxxxxxxx>
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx> (maintainer:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE)
Cc: Russell King <linux@xxxxxxxxxxxxxxx> (maintainer:ARM PORT)
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx (moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE)

Cc: Philippe Ombredanne <pombredanne@xxxxxxxx>
Cc: Lothar WaÃmann <LW@xxxxxxxxxxxxxxxxxxx>

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