[PATCH 00/23] ARM: at91: Properly handle slow clock

[PATCH 00/23] ARM: at91: Properly handle slow clock

[Alexandre Belloni]

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 <a.zummo@towertech.it>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-clk@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: linux-pwm@vger.kernel.org
Cc: linux-watchdog@vger.kernel.org
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: rtc-linux@googlegroups.com
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wim Van Sebroeck <wim@iguana.be>

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

[PATCH 02/23] Documentation: dt: atmel-at91: add slow clock to tcb

[Alexandre Belloni]

From: Boris Brezillon <boris.brezillon@free-electrons.com>

The timer counters need the slow clock. It is required as they
will not function without it.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-pwm@vger.kernel.org
 Documentation/devicetree/bindings/arm/atmel-at91.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
index 209710cdf3aa..dc2d0f06d058 100644
--- a/Documentation/devicetree/bindings/arm/atmel-at91.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt
@@ -62,7 +62,7 @@ TC/TCLIB Timer required properties:
   Note that you can specify several interrupt cells if the TC
   block has one interrupt per channel.
 - clock-names: tuple listing input clock names.
-	Required elements: "t0_clk"
+	Required elements: "t0_clk", "slow_clk"
 	Optional elements: "t1_clk", "t2_clk"
 - clocks: phandles to input clocks.
 
-- 
2.1.4

[PATCH 22/23] misc: atmel_tclib: get and use slow clock

[Alexandre Belloni]

From: Boris Brezillon <boris.brezillon@free-electrons.com>

Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system
hang") added a workaround for the slow clock as it is not properly handled
by its users.

Get and use the slow clock as it is necessary for the timer counters.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-pwm@vger.kernel.org
 drivers/clocksource/tcb_clksrc.c |  8 ++++++++
 drivers/misc/atmel_tclib.c       |  4 ++++
 drivers/pwm/pwm-atmel-tcb.c      | 23 ++++++++++++++++-------
 include/linux/atmel_tc.h         |  1 +
 4 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index b9b7277173c2..969ba03633b0 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -188,6 +188,13 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
 	ret = clk_prepare_enable(t2_clk);
 	if (ret)
 		return ret;
+
+	ret = clk_prepare_enable(tc->slow_clk);
+	if (ret) {
+		clk_disable_unprepare(t2_clk);
+		return ret;
+	}
+
 	clk_disable(t2_clk);
 
 	clkevt.regs = tc->regs;
@@ -200,6 +207,7 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
 	ret = request_irq(irq, ch2_irq, IRQF_TIMER, "tc_clkevt", &clkevt);
 	if (ret) {
 		clk_unprepare(t2_clk);
+		clk_disable_unprepare(tc->slow_clk);
 		return ret;
 	}
 
diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c
index 0ca05c3ec8d6..ac24a4bd63f7 100644
--- a/drivers/misc/atmel_tclib.c
+++ b/drivers/misc/atmel_tclib.c
@@ -125,6 +125,10 @@ static int __init tc_probe(struct platform_device *pdev)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
+	tc->slow_clk = devm_clk_get(&pdev->dev, "slow_clk");
+	if (IS_ERR(tc->slow_clk))
+		return PTR_ERR(tc->slow_clk);
+
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	tc->regs = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(tc->regs))
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index d14e0677c92d..070a32a35295 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -305,7 +305,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	 */
 	if (i == 5) {
 		i = slowclk;
-		rate = 32768;
+		rate = clk_get_rate(tc->slow_clk);
 		min = div_u64(NSEC_PER_SEC, rate);
 		max = min << tc->tcb_config->counter_width;
 
@@ -387,9 +387,9 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 
 	tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
 	if (tcbpwm == NULL) {
-		atmel_tc_free(tc);
+		err = -ENOMEM;
 		dev_err(&pdev->dev, "failed to allocate memory\n");
-		return -ENOMEM;
+		goto err_free_tc;
 	}
 
 	tcbpwm->chip.dev = &pdev->dev;
@@ -400,17 +400,24 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 	tcbpwm->chip.npwm = NPWM;
 	tcbpwm->tc = tc;
 
+	err = clk_prepare_enable(tc->slow_clk);
+	if (err)
+		goto err_free_tc;
+
 	spin_lock_init(&tcbpwm->lock);
 
 	err = pwmchip_add(&tcbpwm->chip);
-	if (err < 0) {
-		atmel_tc_free(tc);
-		return err;
-	}
+	if (err < 0)
+		goto err_free_tc;
 
 	platform_set_drvdata(pdev, tcbpwm);
 
 	return 0;
+
+err_free_tc:
+	atmel_tc_free(tc);
+
+	return err;
 }
 
 static int atmel_tcb_pwm_remove(struct platform_device *pdev)
@@ -418,6 +425,8 @@ static int atmel_tcb_pwm_remove(struct platform_device *pdev)
 	struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
 	int err;
 
+	clk_disable_unprepare(tcbpwm->tc->slow_clk);
+
 	err = pwmchip_remove(&tcbpwm->chip);
 	if (err < 0)
 		return err;
diff --git a/include/linux/atmel_tc.h b/include/linux/atmel_tc.h
index b87c1c7c242a..468fdfa643f0 100644
--- a/include/linux/atmel_tc.h
+++ b/include/linux/atmel_tc.h
@@ -67,6 +67,7 @@ struct atmel_tc {
 	const struct atmel_tcb_config *tcb_config;
 	int			irq[3];
 	struct clk		*clk[3];
+	struct clk		*slow_clk;
 	struct list_head	node;
 	bool			allocated;
 };
-- 
2.1.4

Re: [PATCH 00/23] ARM: at91: Properly handle slow clock

[Boris Brezillon]

Hi Alexandre,

On Fri, 31 Jul 2015 11:39:36 +0200
Alexandre Belloni <alexandre.belloni@free-electrons.com> wrote:

> 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

I would have squashed commit 5 to 14 into a single patch, but apart
from that it looks good to me.

Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Thanks,

Boris

> 
> 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 <a.zummo@towertech.it>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: linux-clk@vger.kernel.org
> Cc: linux-pm@vger.kernel.org
> Cc: linux-pwm@vger.kernel.org
> Cc: linux-watchdog@vger.kernel.org
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: rtc-linux@googlegroups.com
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Wim Van Sebroeck <wim@iguana.be>
> 
> 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(-)
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH 00/23] ARM: at91: Properly handle slow clock

[Alexandre Belloni]

Hi,

On 31/07/2015 at 11:59:03 +0200, Boris Brezillon wrote :
> I would have squashed commit 5 to 14 into a single patch, but apart
> from that it looks good to me.
> 

I wanted to clearly list were the slow clock was needed for each soc. It
actually allowed me to find one that was missing.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

Re: [PATCH 00/23] ARM: at91: Properly handle slow clock

[Alexandre Belloni]

Hi,

I realize now that I forgot to add the v2 tag in the subject lines. This
is really v2 :)

On 31/07/2015 at 11:39:36 +0200, Alexandre Belloni wrote :
> 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 <a.zummo@towertech.it>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: linux-clk@vger.kernel.org
> Cc: linux-pm@vger.kernel.org
> Cc: linux-pwm@vger.kernel.org
> Cc: linux-watchdog@vger.kernel.org
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: rtc-linux@googlegroups.com
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Wim Van Sebroeck <wim@iguana.be>
> 
> 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
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

Re: [PATCH 22/23] misc: atmel_tclib: get and use slow clock

[Greg Kroah-Hartman]

On Fri, Jul 31, 2015 at 11:39:58AM +0200, Alexandre Belloni wrote:
> From: Boris Brezillon <boris.brezillon@free-electrons.com>
> 
> Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system
> hang") added a workaround for the slow clock as it is not properly handled
> by its users.
> 
> Get and use the slow clock as it is necessary for the timer counters.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> ---
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: linux-pwm@vger.kernel.org
>  drivers/clocksource/tcb_clksrc.c |  8 ++++++++
>  drivers/misc/atmel_tclib.c       |  4 ++++
>  drivers/pwm/pwm-atmel-tcb.c      | 23 ++++++++++++++++-------
>  include/linux/atmel_tc.h         |  1 +
>  4 files changed, 29 insertions(+), 7 deletions(-)
> 

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>