linux-kernel - [PATCH v2 0/2] add Microchip PIT64B timer

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Message-ID: <1572880204-4514-1-git-send-email-claudiu.beznea@microchip.com>
Date:   Mon, 4 Nov 2019 17:10:02 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <daniel.lezcano@...aro.org>,
        <tglx@...utronix.de>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH v2 0/2] add Microchip PIT64B timer

Hi,

This series adds driver for Microchip PIT64B timer.
Timer could be used in continuous or oneshot mode. It has 2x32 bit registers
to emulate a 64 bit timer. The timer's period could be configured via LSB_PR
and MSB_PR registers. The current timer's value could be checked via TLSB and
TMSB registers. When (TMSB << 32) | TLSB value reach the (MSB_PR << 32) | LSB_PR
interrupt is raised. If in contiuous mode the TLSB and TMSB resets and restart
counting.

This drivers uses PIT64B capabilities for clocksource and clockevent.
The first requested PIT64B timer is used for clockevent. The second one is used
for clocksource. Individual PIT64B hardware resources were used for clocksource
and clockevent to be able to support high resolution timers with this PIT64B
implementation.

Thank you,
Claudiu Beznea

Changes in v2:
- remove clock-frequency DT binding and hardcoded it in the driver
- initialize best_pres variable in mchp_pit64b_pres_prepare()
- remove MCHP_PIT64B_DEF_FREQ 
- get rid of patches 3-5 from v1 [1] since there is no entry in MAINTAINERS file
  for this entry. It was removed in commit
  44015a8181a5 ("MAINTAINERS: at91: remove the TC entry")

[1] https://lore.kernel.org/lkml/1552580772-8499-1-git-send-email-claudiu.beznea@microchip.com/

Claudiu Beznea (2):
  dt-bindings: arm: atmel: add bindings for PIT64B
  clocksource/drivers/timer-microchip-pit64b: add Microchip PIT64B
    support

 .../devicetree/bindings/arm/atmel-sysregs.txt      |   6 +
 drivers/clocksource/Kconfig                        |   6 +
 drivers/clocksource/Makefile                       |   1 +
 drivers/clocksource/timer-microchip-pit64b.c       | 462 +++++++++++++++++++++
 4 files changed, 475 insertions(+)
 create mode 100644 drivers/clocksource/timer-microchip-pit64b.c

-- 
2.7.4