[PATCH v3 0/6] Armada 370/XP clocksource fixes

[PATCH v3 0/6] Armada 370/XP clocksource fixes

[Ezequiel Garcia]

This small patchset fixes a somewhat minor issue found in the clocksource
driver for Armada 370/XP SoC.

On one side the Armada 370 SoC has no 25 MHz fixed timer.
On the other side the Armada XP SoC cannot work properly without such 25 MHz
fixed timer selected, because otherwise the base clock frequency would vary
when doing cpufreq frequency changes.

Therefore we can consider the SoCs as not being compatible, being better to
have two compatible strings, one for each SoC. The previous compatible and
its behavior has been removed, considering there are no DT-enabled boards
in use in the field.

In addition, CLOCKSOURCE_OF_DECLARE is used to simplify the initialization.

This patchset is based on v3.11-rc4. Also, to ease maintainer's task this
is based on these two patches which are in linux-next:

  commit be14114934545f52be2ffddbe401ba0951007c59
  Author: Stephen Boyd <sboyd@codeaurora.org>
  "clocksource: time-armada-370-xp: Divorce from local timer API"

  commit 4047c794ae18c467a5ea987265238186bc253f61
  Author: Stephen Boyd <sboyd@codeaurora.org>
  "clocksource: time-armada-370-xp: Fix sparse warning"

Any testing and feedback is highly appreciated!

Changes from v2:

  * As suggested by Jason Cooper, and given there are no DT-enabled
    boards in the field, the previous compatible string is *removed*
    instead of being retained and changes in documentation and .dts
    files are added as needed.

Changes from v1:

  * Declare TIMER_CTRL register access helpers as static,
    as reported by Andrew Lunn.

  * Add some documentation about the deprecated compatible string
    in the clocksource driver, as suggested by Andrew Lunn.

  * Add to the series a cosmetic patch to use BIT()

  * Rebased on top of two patches for the armada-370-xp clocksource
    driver, that are already in linux-next.

  * Reordered the patches: bare cleanup first, improvements later.

Ezequiel Garcia (6):
  clocksource: armada-370-xp: Use BIT()
  clocksource: armada-370-xp: Simplify TIMER_CTRL register access
  clocksource: armada-370-xp: Use CLOCKSOURCE_OF_DECLARE
  clocksource: armada-370-xp: Introduce new compatibles
  clocksource: armada-370-xp: Fix device-tree binding
  ARM: mvebu: Fix the Armada 370/XP timer compatible strings

 .../bindings/timer/marvell,armada-370-xp-timer.txt |  27 ++++-
 arch/arm/boot/dts/armada-370-xp.dtsi               |   2 -
 arch/arm/boot/dts/armada-370.dtsi                  |   5 +
 arch/arm/boot/dts/armada-xp.dtsi                   |   2 +-
 arch/arm/mach-mvebu/armada-370-xp.c                |   4 +-
 drivers/clocksource/time-armada-370-xp.c           | 127 ++++++++++++---------
 include/linux/time-armada-370-xp.h                 |  16 ---
 7 files changed, 103 insertions(+), 80 deletions(-)
 delete mode 100644 include/linux/time-armada-370-xp.h

-- 
1.8.1.5

[PATCH v3 1/6] clocksource: armada-370-xp: Use BIT()

[Ezequiel Garcia]

This is a purely cosmetic commit: we replace hardcoded values that
representing bits by BIT(), which is slightly more readable.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 drivers/clocksource/time-armada-370-xp.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 847cab6..ed584ec 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -36,13 +36,13 @@
  * Timer block registers.
  */
 #define TIMER_CTRL_OFF		0x0000
-#define  TIMER0_EN		 0x0001
-#define  TIMER0_RELOAD_EN	 0x0002
-#define  TIMER0_25MHZ            0x0800
+#define  TIMER0_EN		 BIT(0)
+#define  TIMER0_RELOAD_EN	 BIT(1)
+#define  TIMER0_25MHZ            BIT(11)
 #define  TIMER0_DIV(div)         ((div) << 19)
-#define  TIMER1_EN		 0x0004
-#define  TIMER1_RELOAD_EN	 0x0008
-#define  TIMER1_25MHZ            0x1000
+#define  TIMER1_EN		 BIT(2)
+#define  TIMER1_RELOAD_EN	 BIT(3)
+#define  TIMER1_25MHZ            BIT(12)
 #define  TIMER1_DIV(div)         ((div) << 22)
 #define TIMER_EVENTS_STATUS	0x0004
 #define  TIMER0_CLR_MASK         (~0x1)
-- 
1.8.1.5

[PATCH v3 2/6] clocksource: armada-370-xp: Simplify TIMER_CTRL register access

[Ezequiel Garcia]

This commit creates two functions to access the TIMER_CTRL register:
one for global one for the per-cpu. This makes the code much more
readable. In addition, since the TIMER_CTRL register is also used for
watchdog, this is preparation work for future thread-safe improvements.

Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 drivers/clocksource/time-armada-370-xp.c | 62 +++++++++++++++-----------------
 1 file changed, 29 insertions(+), 33 deletions(-)

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index ed584ec..6b4f4a9 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -72,6 +72,18 @@ static u32 ticks_per_jiffy;
 
 static struct clock_event_device __percpu *armada_370_xp_evt;
 
+static void timer_ctrl_clrset(u32 clr, u32 set)
+{
+	writel((readl(timer_base + TIMER_CTRL_OFF) & ~clr) | set,
+		timer_base + TIMER_CTRL_OFF);
+}
+
+static void local_timer_ctrl_clrset(u32 clr, u32 set)
+{
+	writel((readl(local_base + TIMER_CTRL_OFF) & ~clr) | set,
+		local_base + TIMER_CTRL_OFF);
+}
+
 static u32 notrace armada_370_xp_read_sched_clock(void)
 {
 	return ~readl(timer_base + TIMER0_VAL_OFF);
@@ -84,7 +96,6 @@ static int
 armada_370_xp_clkevt_next_event(unsigned long delta,
 				struct clock_event_device *dev)
 {
-	u32 u;
 	/*
 	 * Clear clockevent timer interrupt.
 	 */
@@ -98,11 +109,8 @@ armada_370_xp_clkevt_next_event(unsigned long delta,
 	/*
 	 * Enable the timer.
 	 */
-	u = readl(local_base + TIMER_CTRL_OFF);
-	u = ((u & ~TIMER0_RELOAD_EN) | TIMER0_EN |
-	     TIMER0_DIV(TIMER_DIVIDER_SHIFT));
-	writel(u, local_base + TIMER_CTRL_OFF);
-
+	local_timer_ctrl_clrset(TIMER0_RELOAD_EN,
+				TIMER0_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT));
 	return 0;
 }
 
@@ -110,8 +118,6 @@ static void
 armada_370_xp_clkevt_mode(enum clock_event_mode mode,
 			  struct clock_event_device *dev)
 {
-	u32 u;
-
 	if (mode == CLOCK_EVT_MODE_PERIODIC) {
 
 		/*
@@ -123,18 +129,14 @@ armada_370_xp_clkevt_mode(enum clock_event_mode mode,
 		/*
 		 * Enable timer.
 		 */
-
-		u = readl(local_base + TIMER_CTRL_OFF);
-
-		writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
-			TIMER0_DIV(TIMER_DIVIDER_SHIFT)),
-			local_base + TIMER_CTRL_OFF);
+		local_timer_ctrl_clrset(0, TIMER0_RELOAD_EN |
+					   TIMER0_EN |
+					   TIMER0_DIV(TIMER_DIVIDER_SHIFT));
 	} else {
 		/*
 		 * Disable timer.
 		 */
-		u = readl(local_base + TIMER_CTRL_OFF);
-		writel(u & ~TIMER0_EN, local_base + TIMER_CTRL_OFF);
+		local_timer_ctrl_clrset(TIMER0_EN, 0);
 
 		/*
 		 * ACK pending timer interrupt.
@@ -163,14 +165,14 @@ static irqreturn_t armada_370_xp_timer_interrupt(int irq, void *dev_id)
  */
 static int armada_370_xp_timer_setup(struct clock_event_device *evt)
 {
-	u32 u;
+	u32 clr = 0, set = 0;
 	int cpu = smp_processor_id();
 
-	u = readl(local_base + TIMER_CTRL_OFF);
 	if (timer25Mhz)
-		writel(u | TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
+		set = TIMER0_25MHZ;
 	else
-		writel(u & ~TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
+		clr = TIMER0_25MHZ;
+	local_timer_ctrl_clrset(clr, set);
 
 	evt->name		= "armada_370_xp_per_cpu_tick",
 	evt->features		= CLOCK_EVT_FEAT_ONESHOT |
@@ -219,7 +221,7 @@ static struct notifier_block armada_370_xp_timer_cpu_nb = {
 
 void __init armada_370_xp_timer_init(void)
 {
-	u32 u;
+	u32 clr = 0, set = 0;
 	struct device_node *np;
 	int res;
 
@@ -230,23 +232,19 @@ void __init armada_370_xp_timer_init(void)
 
 	if (of_find_property(np, "marvell,timer-25Mhz", NULL)) {
 		/* The fixed 25MHz timer is available so let's use it */
-		u = readl(timer_base + TIMER_CTRL_OFF);
-		writel(u | TIMER0_25MHZ,
-		       timer_base + TIMER_CTRL_OFF);
+		set = TIMER0_25MHZ;
 		timer_clk = 25000000;
 	} else {
 		unsigned long rate = 0;
 		struct clk *clk = of_clk_get(np, 0);
 		WARN_ON(IS_ERR(clk));
 		rate =  clk_get_rate(clk);
-
-		u = readl(timer_base + TIMER_CTRL_OFF);
-		writel(u & ~(TIMER0_25MHZ),
-		       timer_base + TIMER_CTRL_OFF);
-
 		timer_clk = rate / TIMER_DIVIDER;
+
+		clr = TIMER0_25MHZ;
 		timer25Mhz = false;
 	}
+	timer_ctrl_clrset(clr, set);
 
 	/*
 	 * We use timer 0 as clocksource, and private(local) timer 0
@@ -268,10 +266,8 @@ void __init armada_370_xp_timer_init(void)
 	writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
 	writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
 
-	u = readl(timer_base + TIMER_CTRL_OFF);
-
-	writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
-		TIMER0_DIV(TIMER_DIVIDER_SHIFT)), timer_base + TIMER_CTRL_OFF);
+	timer_ctrl_clrset(0, TIMER0_EN | TIMER0_RELOAD_EN |
+			     TIMER0_DIV(TIMER_DIVIDER_SHIFT));
 
 	clocksource_mmio_init(timer_base + TIMER0_VAL_OFF,
 			      "armada_370_xp_clocksource",
-- 
1.8.1.5

[PATCH v3 3/6] clocksource: armada-370-xp: Use CLOCKSOURCE_OF_DECLARE

[Ezequiel Garcia]

This is almost cosmetic: we achieve a bit of consistency with
other clocksource drivers by using the CLOCKSOURCE_OF_DECLARE
macro for the boilerplate code.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 arch/arm/mach-mvebu/armada-370-xp.c      |  4 ++--
 drivers/clocksource/time-armada-370-xp.c |  7 +++----
 include/linux/time-armada-370-xp.h       | 16 ----------------
 3 files changed, 5 insertions(+), 22 deletions(-)
 delete mode 100644 include/linux/time-armada-370-xp.h

diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
index 97cbb80..4ea03ad 100644
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -18,7 +18,7 @@
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/io.h>
-#include <linux/time-armada-370-xp.h>
+#include <linux/clocksource.h>
 #include <linux/dma-mapping.h>
 #include <linux/mbus.h>
 #include <asm/hardware/cache-l2x0.h>
@@ -69,7 +69,7 @@ static void __init armada_370_xp_mbus_init(void)
 static void __init armada_370_xp_timer_and_clk_init(void)
 {
 	of_clk_init(NULL);
-	armada_370_xp_timer_init();
+	clocksource_of_init();
 	coherency_init();
 	armada_370_xp_mbus_init();
 #ifdef CONFIG_CACHE_L2X0
diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 6b4f4a9..89e7871 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -30,7 +30,6 @@
 #include <linux/module.h>
 #include <linux/sched_clock.h>
 #include <linux/percpu.h>
-#include <linux/time-armada-370-xp.h>
 
 /*
  * Timer block registers.
@@ -219,13 +218,11 @@ static struct notifier_block armada_370_xp_timer_cpu_nb = {
 	.notifier_call = armada_370_xp_timer_cpu_notify,
 };
 
-void __init armada_370_xp_timer_init(void)
+static void __init armada_370_xp_timer_init(struct device_node *np)
 {
 	u32 clr = 0, set = 0;
-	struct device_node *np;
 	int res;
 
-	np = of_find_compatible_node(NULL, NULL, "marvell,armada-370-xp-timer");
 	timer_base = of_iomap(np, 0);
 	WARN_ON(!timer_base);
 	local_base = of_iomap(np, 1);
@@ -289,3 +286,5 @@ void __init armada_370_xp_timer_init(void)
 	if (!res)
 		armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
 }
+CLOCKSOURCE_OF_DECLARE(armada_370_xp, "marvell,armada-370-xp-timer",
+		       armada_370_xp_timer_init);
diff --git a/include/linux/time-armada-370-xp.h b/include/linux/time-armada-370-xp.h
deleted file mode 100644
index 6fb0856..0000000
--- a/include/linux/time-armada-370-xp.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Marvell Armada 370/XP SoC timer handling.
- *
- * Copyright (C) 2012 Marvell
- *
- * Lior Amsalem <alior@marvell.com>
- * Gregory CLEMENT <gregory.clement@free-electrons.com>
- * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
- *
- */
-#ifndef __TIME_ARMADA_370_XPPRCMU_H
-#define __TIME_ARMADA_370_XPPRCMU_H
-
-void armada_370_xp_timer_init(void);
-
-#endif
-- 
1.8.1.5

[PATCH v3 4/6] clocksource: armada-370-xp: Introduce new compatibles

[Ezequiel Garcia]

The Armada XP SoC clocksource driver cannot work without the 25 MHz
fixed timer. Therefore it's appropriate to introduce a new compatible
string and use it to set the 25 MHz fixed timer.

The 'marvell,timer-25MHz' property will be marked as deprecated.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 drivers/clocksource/time-armada-370-xp.c | 54 +++++++++++++++++++++++---------
 1 file changed, 39 insertions(+), 15 deletions(-)

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 89e7871..11d91e5 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -13,6 +13,19 @@
  *
  * Timer 0 is used as free-running clocksource, while timer 1 is
  * used as clock_event_device.
+ *
+ * ---
+ * Clocksource driver for Armada 370 and Armada XP SoC.
+ * This driver implements one compatible string for each SoC, given
+ * each has its own characteristics:
+ *
+ *   * Armada 370 has no 25 MHz fixed timer.
+ *
+ *   * Armada XP cannot work properly without such 25 MHz fixed timer as
+ *     doing otherwise leads to using a clocksource whose frequency varies
+ *     when doing cpufreq frequency changes.
+ *
+ * See Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
  */
 
 #include <linux/init.h>
@@ -218,7 +231,7 @@ static struct notifier_block armada_370_xp_timer_cpu_nb = {
 	.notifier_call = armada_370_xp_timer_cpu_notify,
 };
 
-static void __init armada_370_xp_timer_init(struct device_node *np)
+static void __init armada_370_xp_timer_common_init(struct device_node *np)
 {
 	u32 clr = 0, set = 0;
 	int res;
@@ -227,20 +240,10 @@ static void __init armada_370_xp_timer_init(struct device_node *np)
 	WARN_ON(!timer_base);
 	local_base = of_iomap(np, 1);
 
-	if (of_find_property(np, "marvell,timer-25Mhz", NULL)) {
-		/* The fixed 25MHz timer is available so let's use it */
+	if (timer25Mhz)
 		set = TIMER0_25MHZ;
-		timer_clk = 25000000;
-	} else {
-		unsigned long rate = 0;
-		struct clk *clk = of_clk_get(np, 0);
-		WARN_ON(IS_ERR(clk));
-		rate =  clk_get_rate(clk);
-		timer_clk = rate / TIMER_DIVIDER;
-
+	else
 		clr = TIMER0_25MHZ;
-		timer25Mhz = false;
-	}
 	timer_ctrl_clrset(clr, set);
 
 	/*
@@ -286,5 +289,26 @@ static void __init armada_370_xp_timer_init(struct device_node *np)
 	if (!res)
 		armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
 }
-CLOCKSOURCE_OF_DECLARE(armada_370_xp, "marvell,armada-370-xp-timer",
-		       armada_370_xp_timer_init);
+
+static void __init armada_xp_timer_init(struct device_node *np)
+{
+	/* The fixed 25MHz timer is required, timer25Mhz is true by default */
+	timer_clk = 25000000;
+
+	armada_370_xp_timer_common_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(armada_xp, "marvell,armada-xp-timer",
+		       armada_xp_timer_init);
+
+static void __init armada_370_timer_init(struct device_node *np)
+{
+	struct clk *clk = of_clk_get(np, 0);
+
+	WARN_ON(IS_ERR(clk));
+	timer_clk = clk_get_rate(clk) / TIMER_DIVIDER;
+	timer25Mhz = false;
+
+	armada_370_xp_timer_common_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(armada_370, "marvell,armada-370-timer",
+		       armada_370_timer_init);
-- 
1.8.1.5

[PATCH v3 5/6] clocksource: armada-370-xp: Fix device-tree binding

[Ezequiel Garcia]

This commit fixes the DT binding for the Armada 370/XP SoC timer.
The previous "marvell,armada-370-xp-timer" compatible is removed and
two new compatible strings are introduced: "marvell,armada-xp-timer"
and "marvell,armada-370-timer".

The rationale behind this change is that the Armada 370 SoC and the
Armada XP SoC timers are not really compatible:

  * Armada 370 has no 25 MHz fixed timer.

  * Armada XP cannot work properly without such 25 MHz fixed timer
    as doing otherwise leads to using a clocksource whose frequency
    varies when doing cpufreq frequency changes.

This commit also removes the "marvell,timer-25Mhz" property, given
it's now meaningless.

Cc: devicetree at vger.kernel.org
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 .../bindings/timer/marvell,armada-370-xp-timer.txt | 27 ++++++++++++++++++----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt b/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
index 3638112..4c453b2 100644
--- a/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
+++ b/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
@@ -2,14 +2,31 @@ Marvell Armada 370 and Armada XP Timers
 ---------------------------------------
 
 Required properties:
-- compatible: Should be "marvell,armada-370-xp-timer"
+- compatible: Should be either "marvell,armada-370-timer" or
+  "marvell,armada-xp-timer" as appropriate.
 - interrupts: Should contain the list of Global Timer interrupts and
   then local timer interrupts
 - reg: Should contain location and length for timers register. First
   pair for the Global Timer registers, second pair for the
   local/private timers.
-- clocks: clock driving the timer hardware
+- clocks: clock driving the timer hardware, only required for
+  "marvell,armada-370-timer";
 
-Optional properties:
-- marvell,timer-25Mhz: Tells whether the Global timer supports the 25
-  Mhz fixed mode (available on Armada XP and not on Armada 370)
+Examples:
+
+- Armada 370:
+
+	timer {
+		compatible = "marvell,armada-370-timer";
+		reg = <0x20300 0x30>, <0x21040 0x30>;
+		interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
+		clocks = <&coreclk 2>;
+	};
+
+- Armada XP:
+
+	timer {
+		compatible = "marvell,armada-xp-timer";
+		reg = <0x20300 0x30>, <0x21040 0x30>;
+		interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
+	};
-- 
1.8.1.5

[PATCH v3 6/6] ARM: mvebu: Fix the Armada 370/XP timer compatible strings

[Ezequiel Garcia]

The "marvell,armada-370-xp-timer" compatible string, together with
the "marvell,timer-25Mhz" property are deprecated and should be
removed from current DT.

Instead, the timer DT nodes are now required to have an appropriate
compatible string, which should be either "marvell,armada-370-timer"
or "marvell,armada-xp-timer", depending on SoC.

The clock property is now required only for Armada 370 so move it accordingly.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 arch/arm/boot/dts/armada-370-xp.dtsi | 2 --
 arch/arm/boot/dts/armada-370.dtsi    | 5 +++++
 arch/arm/boot/dts/armada-xp.dtsi     | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/armada-370-xp.dtsi b/arch/arm/boot/dts/armada-370-xp.dtsi
index 90b1176..442c84e 100644
--- a/arch/arm/boot/dts/armada-370-xp.dtsi
+++ b/arch/arm/boot/dts/armada-370-xp.dtsi
@@ -81,10 +81,8 @@
 			};
 
 			timer at 20300 {
-				compatible = "marvell,armada-370-xp-timer";
 				reg = <0x20300 0x30>, <0x21040 0x30>;
 				interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
-				clocks = <&coreclk 2>;
 			};
 
 			sata at a0000 {
diff --git a/arch/arm/boot/dts/armada-370.dtsi b/arch/arm/boot/dts/armada-370.dtsi
index fa3dfc6..f166367 100644
--- a/arch/arm/boot/dts/armada-370.dtsi
+++ b/arch/arm/boot/dts/armada-370.dtsi
@@ -104,6 +104,11 @@
 				interrupts = <91>;
 			};
 
+			timer at 20300 {
+				compatible = "marvell,armada-370-timer";
+				clocks = <&coreclk 2>;
+			};
+
 			coreclk: mvebu-sar at 18230 {
 				compatible = "marvell,armada-370-core-clock";
 				reg = <0x18230 0x08>;
diff --git a/arch/arm/boot/dts/armada-xp.dtsi b/arch/arm/boot/dts/armada-xp.dtsi
index 416eb94..549151e 100644
--- a/arch/arm/boot/dts/armada-xp.dtsi
+++ b/arch/arm/boot/dts/armada-xp.dtsi
@@ -62,7 +62,7 @@
 			};
 
 			timer at 20300 {
-				marvell,timer-25Mhz;
+				compatible = "marvell,armada-xp-timer";
 			};
 
 			coreclk: mvebu-sar at 18230 {
-- 
1.8.1.5

[PATCH v3 5/6] clocksource: armada-370-xp: Fix device-tree binding

[Jason Cooper]

On Mon, Aug 12, 2013 at 04:16:55PM -0300, Ezequiel Garcia wrote:
> This commit fixes the DT binding for the Armada 370/XP SoC timer.
> The previous "marvell,armada-370-xp-timer" compatible is removed and
> two new compatible strings are introduced: "marvell,armada-xp-timer"
> and "marvell,armada-370-timer".
> 
> The rationale behind this change is that the Armada 370 SoC and the
> Armada XP SoC timers are not really compatible:
> 
>   * Armada 370 has no 25 MHz fixed timer.
> 
>   * Armada XP cannot work properly without such 25 MHz fixed timer
>     as doing otherwise leads to using a clocksource whose frequency
>     varies when doing cpufreq frequency changes.
> 
> This commit also removes the "marvell,timer-25Mhz" property, given
> it's now meaningless.
> 
> Cc: devicetree at vger.kernel.org
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
> ---
>  .../bindings/timer/marvell,armada-370-xp-timer.txt | 27 ++++++++++++++++++----
>  1 file changed, 22 insertions(+), 5 deletions(-)

As there are no native DT-booting Marvell products in the wild yet,

Acked-by: Jason Cooper <jason@lakedaemon.net>

thx,

Jason.

> 
> diff --git a/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt b/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
> index 3638112..4c453b2 100644
> --- a/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
> +++ b/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
> @@ -2,14 +2,31 @@ Marvell Armada 370 and Armada XP Timers
>  ---------------------------------------
>  
>  Required properties:
> -- compatible: Should be "marvell,armada-370-xp-timer"
> +- compatible: Should be either "marvell,armada-370-timer" or
> +  "marvell,armada-xp-timer" as appropriate.
>  - interrupts: Should contain the list of Global Timer interrupts and
>    then local timer interrupts
>  - reg: Should contain location and length for timers register. First
>    pair for the Global Timer registers, second pair for the
>    local/private timers.
> -- clocks: clock driving the timer hardware
> +- clocks: clock driving the timer hardware, only required for
> +  "marvell,armada-370-timer";
>  
> -Optional properties:
> -- marvell,timer-25Mhz: Tells whether the Global timer supports the 25
> -  Mhz fixed mode (available on Armada XP and not on Armada 370)
> +Examples:
> +
> +- Armada 370:
> +
> +	timer {
> +		compatible = "marvell,armada-370-timer";
> +		reg = <0x20300 0x30>, <0x21040 0x30>;
> +		interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
> +		clocks = <&coreclk 2>;
> +	};
> +
> +- Armada XP:
> +
> +	timer {
> +		compatible = "marvell,armada-xp-timer";
> +		reg = <0x20300 0x30>, <0x21040 0x30>;
> +		interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
> +	};
> -- 
> 1.8.1.5
> 

[PATCH v3 0/6] Armada 370/XP clocksource fixes

[Daniel Lezcano]

On 08/12/2013 09:16 PM, Ezequiel Garcia wrote:
> This small patchset fixes a somewhat minor issue found in the clocksource
> driver for Armada 370/XP SoC.
> 
> On one side the Armada 370 SoC has no 25 MHz fixed timer.
> On the other side the Armada XP SoC cannot work properly without such 25 MHz
> fixed timer selected, because otherwise the base clock frequency would vary
> when doing cpufreq frequency changes.
> 
> Therefore we can consider the SoCs as not being compatible, being better to
> have two compatible strings, one for each SoC. The previous compatible and
> its behavior has been removed, considering there are no DT-enabled boards
> in use in the field.
> 
> In addition, CLOCKSOURCE_OF_DECLARE is used to simplify the initialization.
> 
> This patchset is based on v3.11-rc4. Also, to ease maintainer's task this
> is based on these two patches which are in linux-next:
> 
>   commit be14114934545f52be2ffddbe401ba0951007c59
>   Author: Stephen Boyd <sboyd@codeaurora.org>
>   "clocksource: time-armada-370-xp: Divorce from local timer API"
> 
>   commit 4047c794ae18c467a5ea987265238186bc253f61
>   Author: Stephen Boyd <sboyd@codeaurora.org>
>   "clocksource: time-armada-370-xp: Fix sparse warning"

Your patchset does not apply to my tree for timers/core

These two patches described above are in the ARM tree, not available in
the timers/core tree.

The correct submission path for these would have been through timers/urgent:

timers/urgent -> v3.11-rcX -> arm-soc
                           -> timers/core

Or alternatively if it depends on material in arm-soc, a pull request
based in a v3.11-rcX where Olof and I can pull from.

I guess you have to rebase your patchset on top of timers/core.

Thanks
  -- Daniel



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[PATCH v3 0/6] Armada 370/XP clocksource fixes

[Ezequiel Garcia]

On Tue, Aug 13, 2013 at 02:28:41PM +0200, Daniel Lezcano wrote:
> On 08/12/2013 09:16 PM, Ezequiel Garcia wrote:
> > This small patchset fixes a somewhat minor issue found in the clocksource
> > driver for Armada 370/XP SoC.
> > 
> > On one side the Armada 370 SoC has no 25 MHz fixed timer.
> > On the other side the Armada XP SoC cannot work properly without such 25 MHz
> > fixed timer selected, because otherwise the base clock frequency would vary
> > when doing cpufreq frequency changes.
> > 
> > Therefore we can consider the SoCs as not being compatible, being better to
> > have two compatible strings, one for each SoC. The previous compatible and
> > its behavior has been removed, considering there are no DT-enabled boards
> > in use in the field.
> > 
> > In addition, CLOCKSOURCE_OF_DECLARE is used to simplify the initialization.
> > 
> > This patchset is based on v3.11-rc4. Also, to ease maintainer's task this
> > is based on these two patches which are in linux-next:
> > 
> >   commit be14114934545f52be2ffddbe401ba0951007c59
> >   Author: Stephen Boyd <sboyd@codeaurora.org>
> >   "clocksource: time-armada-370-xp: Divorce from local timer API"
> > 
> >   commit 4047c794ae18c467a5ea987265238186bc253f61
> >   Author: Stephen Boyd <sboyd@codeaurora.org>
> >   "clocksource: time-armada-370-xp: Fix sparse warning"
> 
> Your patchset does not apply to my tree for timers/core
> 
> These two patches described above are in the ARM tree, not available in
> the timers/core tree.
> 
> The correct submission path for these would have been through timers/urgent:
> 
> timers/urgent -> v3.11-rcX -> arm-soc
>                            -> timers/core
> 
> Or alternatively if it depends on material in arm-soc, a pull request
> based in a v3.11-rcX where Olof and I can pull from.
> 
> I guess you have to rebase your patchset on top of timers/core.
> 

Sure. I'll just send this patchset on top of timers/core.

I guess it was just a silly thing to base this on top of those
two patches.

Thanks,
-- 
Ezequiel Garc?a, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com

[PATCH v3 0/6] Armada 370/XP clocksource fixes

[Daniel Lezcano]

On 08/13/2013 04:05 PM, Ezequiel Garcia wrote:
> On Tue, Aug 13, 2013 at 02:28:41PM +0200, Daniel Lezcano wrote:
>> On 08/12/2013 09:16 PM, Ezequiel Garcia wrote:
>>> This small patchset fixes a somewhat minor issue found in the clocksource
>>> driver for Armada 370/XP SoC.
>>>
>>> On one side the Armada 370 SoC has no 25 MHz fixed timer.
>>> On the other side the Armada XP SoC cannot work properly without such 25 MHz
>>> fixed timer selected, because otherwise the base clock frequency would vary
>>> when doing cpufreq frequency changes.
>>>
>>> Therefore we can consider the SoCs as not being compatible, being better to
>>> have two compatible strings, one for each SoC. The previous compatible and
>>> its behavior has been removed, considering there are no DT-enabled boards
>>> in use in the field.
>>>
>>> In addition, CLOCKSOURCE_OF_DECLARE is used to simplify the initialization.
>>>
>>> This patchset is based on v3.11-rc4. Also, to ease maintainer's task this
>>> is based on these two patches which are in linux-next:
>>>
>>>   commit be14114934545f52be2ffddbe401ba0951007c59
>>>   Author: Stephen Boyd <sboyd@codeaurora.org>
>>>   "clocksource: time-armada-370-xp: Divorce from local timer API"
>>>
>>>   commit 4047c794ae18c467a5ea987265238186bc253f61
>>>   Author: Stephen Boyd <sboyd@codeaurora.org>
>>>   "clocksource: time-armada-370-xp: Fix sparse warning"
>>
>> Your patchset does not apply to my tree for timers/core
>>
>> These two patches described above are in the ARM tree, not available in
>> the timers/core tree.
>>
>> The correct submission path for these would have been through timers/urgent:
>>
>> timers/urgent -> v3.11-rcX -> arm-soc
>>                            -> timers/core
>>
>> Or alternatively if it depends on material in arm-soc, a pull request
>> based in a v3.11-rcX where Olof and I can pull from.
>>
>> I guess you have to rebase your patchset on top of timers/core.
>>
> 
> Sure. I'll just send this patchset on top of timers/core.

Ok, thx.

> I guess it was just a silly thing to base this on top of those
> two patches.
> 
> Thanks,
> 


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