From: Alexandre Belloni <alexandre.belloni@bootlin.com> To: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexander Dahl <ada@thorsis.com>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni <alexandre.belloni@bootlin.com> Subject: [PATCH v7 0/7] clocksource: rework Atmel TCB timer driver Date: Thu, 13 Sep 2018 13:30:17 +0200 [thread overview] Message-ID: <20180913113024.3571-1-alexandre.belloni@bootlin.com> (raw) Hi, This series reworks the Atmel TCB drivers. It introduces a new driver to handle the clocksource and clockevent devices. This is necessary because: - the current tcb_clksrc driver is probed too late to be able to be used at boot and we now have SoCs that don't have a PIT. They currently are not able to boot a mainline kernel. - using the PIT doesn't work well with preempt-rt because its interrupt is shared (in particular with the UART and their interrupt flags are incompatible) - the current solution is wasting some TCB channels The plan is to get this driver upstream, then convert the TCB PWM driver to be able to get rid of the tcb_clksrc driver along with atmel_tclib now that AVR32 is gone. changes in v7: - fixed a warning when building on 64 bit platforms changes in v6: - rebased on v4.19-rc1 - separated the clocksource/clockevent and the single clockevent in two different patches - removed struct tc_clkevt_device and simply use struct atmel_tcb_clksrc - removed struct atmel_tcb_info - moved tcb_clk_get and tcb_irq_get to users changes in v5: - rebased on v4.18-rc1 - fixed the clock enabling/disabling in atomic context under preempt-rt Changes in v4: - rebased on top of v4.17-rc1 - fixed an issue when setting max_delta for clockevents_config_and_register Alexandre Belloni (7): ARM: at91: add TCB registers definitions clocksource/drivers: Add a new driver for the Atmel ARM TC blocks clocksource/drivers: timer-atmel-tcb: add clockevent device on separate channel clocksource/drivers: atmel-pit: make option silent ARM: at91: Implement clocksource selection ARM: configs: at91: use new TCB timer driver ARM: configs: at91: unselect PIT arch/arm/configs/at91_dt_defconfig | 2 +- arch/arm/configs/sama5_defconfig | 2 +- arch/arm/mach-at91/Kconfig | 25 ++ drivers/clocksource/Kconfig | 13 +- drivers/clocksource/Makefile | 3 +- drivers/clocksource/timer-atmel-tcb.c | 617 ++++++++++++++++++++++++++ include/soc/at91/atmel_tcb.h | 183 ++++++++ 7 files changed, 841 insertions(+), 4 deletions(-) create mode 100644 drivers/clocksource/timer-atmel-tcb.c create mode 100644 include/soc/at91/atmel_tcb.h -- 2.19.0
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From: alexandre.belloni@bootlin.com (Alexandre Belloni) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v7 0/7] clocksource: rework Atmel TCB timer driver Date: Thu, 13 Sep 2018 13:30:17 +0200 [thread overview] Message-ID: <20180913113024.3571-1-alexandre.belloni@bootlin.com> (raw) Hi, This series reworks the Atmel TCB drivers. It introduces a new driver to handle the clocksource and clockevent devices. This is necessary because: - the current tcb_clksrc driver is probed too late to be able to be used at boot and we now have SoCs that don't have a PIT. They currently are not able to boot a mainline kernel. - using the PIT doesn't work well with preempt-rt because its interrupt is shared (in particular with the UART and their interrupt flags are incompatible) - the current solution is wasting some TCB channels The plan is to get this driver upstream, then convert the TCB PWM driver to be able to get rid of the tcb_clksrc driver along with atmel_tclib now that AVR32 is gone. changes in v7: - fixed a warning when building on 64 bit platforms changes in v6: - rebased on v4.19-rc1 - separated the clocksource/clockevent and the single clockevent in two different patches - removed struct tc_clkevt_device and simply use struct atmel_tcb_clksrc - removed struct atmel_tcb_info - moved tcb_clk_get and tcb_irq_get to users changes in v5: - rebased on v4.18-rc1 - fixed the clock enabling/disabling in atomic context under preempt-rt Changes in v4: - rebased on top of v4.17-rc1 - fixed an issue when setting max_delta for clockevents_config_and_register Alexandre Belloni (7): ARM: at91: add TCB registers definitions clocksource/drivers: Add a new driver for the Atmel ARM TC blocks clocksource/drivers: timer-atmel-tcb: add clockevent device on separate channel clocksource/drivers: atmel-pit: make option silent ARM: at91: Implement clocksource selection ARM: configs: at91: use new TCB timer driver ARM: configs: at91: unselect PIT arch/arm/configs/at91_dt_defconfig | 2 +- arch/arm/configs/sama5_defconfig | 2 +- arch/arm/mach-at91/Kconfig | 25 ++ drivers/clocksource/Kconfig | 13 +- drivers/clocksource/Makefile | 3 +- drivers/clocksource/timer-atmel-tcb.c | 617 ++++++++++++++++++++++++++ include/soc/at91/atmel_tcb.h | 183 ++++++++ 7 files changed, 841 insertions(+), 4 deletions(-) create mode 100644 drivers/clocksource/timer-atmel-tcb.c create mode 100644 include/soc/at91/atmel_tcb.h -- 2.19.0
next reply other threads:[~2018-09-13 11:30 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-09-13 11:30 Alexandre Belloni [this message] 2018-09-13 11:30 ` [PATCH v7 0/7] clocksource: rework Atmel TCB timer driver Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 1/7] ARM: at91: add TCB registers definitions Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 2/7] clocksource/drivers: Add a new driver for the Atmel ARM TC blocks Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-24 1:59 ` Daniel Lezcano 2018-09-24 1:59 ` Daniel Lezcano 2018-09-25 21:16 ` Alexandre Belloni 2018-09-25 21:16 ` Alexandre Belloni 2018-10-01 21:24 ` Daniel Lezcano 2018-10-01 21:24 ` Daniel Lezcano 2018-10-03 22:26 ` Alexandre Belloni 2018-10-03 22:26 ` Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 3/7] clocksource/drivers: timer-atmel-tcb: add clockevent device on separate channel Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 4/7] clocksource/drivers: atmel-pit: make option silent Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 5/7] ARM: at91: Implement clocksource selection Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 6/7] ARM: configs: at91: use new TCB timer driver Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-13 11:30 ` [PATCH v7 7/7] ARM: configs: at91: unselect PIT Alexandre Belloni 2018-09-13 11:30 ` Alexandre Belloni 2018-09-22 11:29 ` [PATCH v7 0/7] clocksource: rework Atmel TCB timer driver Daniel Lezcano 2018-09-22 11:29 ` Daniel Lezcano 2018-09-25 20:14 ` Alexandre Belloni 2018-09-25 20:14 ` Alexandre Belloni 2018-11-08 12:43 ` Sebastian Andrzej Siewior 2018-11-08 12:43 ` Sebastian Andrzej Siewior 2018-11-08 14:09 ` Alexandre Belloni 2018-11-08 14:09 ` Alexandre Belloni 2018-11-08 14:30 ` Sebastian Andrzej Siewior 2018-11-08 14:30 ` Sebastian Andrzej Siewior
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