From mboxrd@z Thu Jan 1 00:00:00 1970 From: alexandre.belloni@free-electrons.com (Alexandre Belloni) Date: Fri, 31 Jul 2015 11:39:36 +0200 Subject: [PATCH 00/23] ARM: at91: Properly handle slow clock Message-ID: <1438335599-3301-1-git-send-email-alexandre.belloni@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, It was discovered that all the slow clock user were not properly claiming it. This can end up in a system hang because the last registered user is releasing it, and it gets disabled. commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system hang") was a workaround. This series is adding the slow clock to the necessary drivers to avoid the issue and then removes that workaround. The Documentation updates and DT patches should probably go through the AT91 tree this cycle to avoid breakage. Then the other patches can go through each subsystem tree. They are trivial enough to also go in this cycle. The final clk patch depends on the other ones and may be taken for the next cycle to avoid synchronization issues. I've thrown in a cleanup for at91-reset as it avoids adding support for that clock to the platform data initialization Changes in v2: - statisticize the global in the atmel-st change - merge at91_reset_of_probe() in at91_reset_probe() - added patches from Boris for the TCB - added the slow clock to the TCB Cc: Alessandro Zummo Cc: Arnd Bergmann Cc: Daniel Lezcano Cc: Dmitry Eremin-Solenikov Cc: Greg Kroah-Hartman Cc: linux-clk at vger.kernel.org Cc: linux-pm at vger.kernel.org Cc: linux-pwm at vger.kernel.org Cc: linux-watchdog at vger.kernel.org Cc: Michael Turquette Cc: rtc-linux at googlegroups.com Cc: Sebastian Reichel Cc: Stephen Boyd Cc: Thierry Reding Cc: Thomas Gleixner Cc: Wim Van Sebroeck Alexandre Belloni (20): Documentation: dt: atmel-at91: add clocks to system timer, rstc and shdwc Documentation: watchdog: at91sam9_wdt: add clocks property Documentation: dt: rtc: at91rm9200: add clocks property ARM: at91/dt: at91rm9200: use slow clock where necessary ARM: at91/dt: at91sam9260: use slow clock where necessary ARM: at91/dt: at91sam9261: use slow clock where necessary ARM: at91/dt: at91sam9263: use slow clock where necessary ARM: at91/dt: at91sam9g45: use slow clock where necessary ARM: at91/dt: at91sam9n12: use slow clock where necessary ARM: at91/dt: at91sam9rl: use slow clock where necessary ARM: at91/dt: at91sam9x5: use slow clock where necessary ARM: at91/dt: sama5d3: use slow clock where necessary ARM: at91/dt: sama5d4: use slow clock where necessary rtc: at91rm9200: get and use slow clock watchdog: at91sam9: get and use slow clock power/reset: at91-reset: remove useless at91_reset_platform_probe() power/reset: at91-reset: get and use slow clock power/reset: at91-poweroff: get and use slow clock clocksource: atmel-st: get and use slow clock clk: at91: Revert "keep slow clk enabled to prevent system hang" Boris Brezillon (3): Documentation: dt: atmel-at91: add slow clock to tcb clocksource: tcb_clksrc: fix setup_clkevents error path misc: atmel_tclib: get and use slow clock .../devicetree/bindings/arm/atmel-at91.txt | 13 +++-- .../bindings/rtc/atmel,at91rm9200-rtc.txt | 2 + .../devicetree/bindings/watchdog/atmel-wdt.txt | 2 + arch/arm/boot/dts/at91rm9200.dtsi | 10 ++-- arch/arm/boot/dts/at91sam9260.dtsi | 11 +++-- arch/arm/boot/dts/at91sam9261.dtsi | 7 ++- arch/arm/boot/dts/at91sam9263.dtsi | 7 ++- arch/arm/boot/dts/at91sam9g45.dtsi | 12 +++-- arch/arm/boot/dts/at91sam9n12.dtsi | 12 +++-- arch/arm/boot/dts/at91sam9rl.dtsi | 8 ++- arch/arm/boot/dts/at91sam9x5.dtsi | 12 +++-- arch/arm/boot/dts/sama5d3.dtsi | 8 ++- arch/arm/boot/dts/sama5d3_tcb1.dtsi | 4 +- arch/arm/boot/dts/sama5d4.dtsi | 12 +++-- drivers/clk/at91/clk-slow.c | 27 ---------- drivers/clocksource/tcb_clksrc.c | 10 +++- drivers/clocksource/timer-atmel-st.c | 31 ++++++++---- drivers/misc/atmel_tclib.c | 4 ++ drivers/power/reset/at91-poweroff.c | 13 +++++ drivers/power/reset/at91-reset.c | 57 ++++++---------------- drivers/pwm/pwm-atmel-tcb.c | 23 ++++++--- drivers/rtc/rtc-at91rm9200.c | 27 ++++++++-- drivers/watchdog/at91sam9_wdt.c | 22 ++++++++- include/linux/atmel_tc.h | 1 + 24 files changed, 206 insertions(+), 129 deletions(-) -- 2.1.4