Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fixes from Thomas Gleixner:
 "A rather small update for the time(r) subsystem:

   - A new clocksource driver IMX-TPM

   - Minor fixes to the alarmtimer facility

   - Device tree cleanups for Renesas drivers

   - A new kselftest and fixes for the timer related tests

   - Conversion of the clocksource drivers to use %pOF

   - Use the proper helpers to access rlimits in the posix-cpu-timer
     code"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  alarmtimer: Ensure RTC module is not unloaded
  clocksource: Convert to using %pOF instead of full_name
  clocksource/drivers/bcm2835: Remove message for a memory allocation failure
  devicetree: bindings: Remove deprecated properties
  devicetree: bindings: Remove unused 32-bit CMT bindings
  devicetree: bindings: Deprecate property, update example
  devicetree: bindings: r8a73a4 and R-Car Gen2 CMT bindings
  devicetree: bindings: R-Car Gen2 CMT0 and CMT1 bindings
  devicetree: bindings: Remove sh7372 CMT binding
  clocksource/drivers/imx-tpm: Add imx tpm timer support
  dt-bindings: timer: Add nxp tpm timer binding doc
  posix-cpu-timers: Use dedicated helper to access rlimit values
  alarmtimer: Fix unavailable wake-up source in sysfs
  timekeeping: Use proper timekeeper for debug code
  kselftests: timers: set-timer-lat: Add one-shot timer test cases
  kselftests: timers: set-timer-lat: Tweak reporting when timer fires early
  kselftests: timers: freq-step: Fix build warning
  kselftests: timers: freq-step: Define ADJ_SETOFFSET if device has older kernel headers

8 files changed, 261 insertions, 16 deletions

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 54a67f8a28eb..cc6062049170 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -598,6 +598,14 @@ config CLKSRC_IMX_GPT
 	depends on ARM && CLKDEV_LOOKUP
 	select CLKSRC_MMIO
 
+config CLKSRC_IMX_TPM
+	bool "Clocksource using i.MX TPM" if COMPILE_TEST
+	depends on ARM && CLKDEV_LOOKUP && GENERIC_CLOCKEVENTS
+	select CLKSRC_MMIO
+	help
+	  Enable this option to use IMX Timer/PWM Module (TPM) timer as
+	  clocksource.
+
 config CLKSRC_ST_LPC
 	bool "Low power clocksource found in the LPC" if COMPILE_TEST
 	select TIMER_OF if OF
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 6df949402dfc..dbc1ad14515e 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_CLKSRC_VERSATILE)		+= versatile.o
 obj-$(CONFIG_CLKSRC_MIPS_GIC)		+= mips-gic-timer.o
 obj-$(CONFIG_CLKSRC_TANGO_XTAL)		+= tango_xtal.o
 obj-$(CONFIG_CLKSRC_IMX_GPT)		+= timer-imx-gpt.o
+obj-$(CONFIG_CLKSRC_IMX_TPM)		+= timer-imx-tpm.o
 obj-$(CONFIG_ASM9260_TIMER)		+= asm9260_timer.o
 obj-$(CONFIG_H8300_TMR8)		+= h8300_timer8.o
 obj-$(CONFIG_H8300_TMR16)		+= h8300_timer16.o
diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c
index 82828d3a4739..39e489a96ad7 100644
--- a/drivers/clocksource/bcm2835_timer.c
+++ b/drivers/clocksource/bcm2835_timer.c
@@ -114,7 +114,6 @@ static int __init bcm2835_timer_init(struct device_node *node)
 
 	timer = kzalloc(sizeof(*timer), GFP_KERNEL);
 	if (!timer) {
-		pr_err("Can't allocate timer struct\n");
 		ret = -ENOMEM;
 		goto err_iounmap;
 	}
diff --git a/drivers/clocksource/tango_xtal.c b/drivers/clocksource/tango_xtal.c
index c4e1c2e6046f..6a8d9838ce33 100644
--- a/drivers/clocksource/tango_xtal.c
+++ b/drivers/clocksource/tango_xtal.c
@@ -26,13 +26,13 @@ static int __init tango_clocksource_init(struct device_node *np)
 
 	xtal_in_cnt = of_iomap(np, 0);
 	if (xtal_in_cnt == NULL) {
-		pr_err("%s: invalid address\n", np->full_name);
+		pr_err("%pOF: invalid address\n", np);
 		return -ENXIO;
 	}
 
 	clk = of_clk_get(np, 0);
 	if (IS_ERR(clk)) {
-		pr_err("%s: invalid clock\n", np->full_name);
+		pr_err("%pOF: invalid clock\n", np);
 		return PTR_ERR(clk);
 	}
 
@@ -43,7 +43,7 @@ static int __init tango_clocksource_init(struct device_node *np)
 	ret = clocksource_mmio_init(xtal_in_cnt, "tango-xtal", xtal_freq, 350,
 				    32, clocksource_mmio_readl_up);
 	if (ret) {
-		pr_err("%s: registration failed\n", np->full_name);
+		pr_err("%pOF: registration failed\n", np);
 		return ret;
 	}
 
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
new file mode 100644
index 000000000000..21bffdcb2f20
--- /dev/null
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017 NXP
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
+
+#define TPM_SC				0x10
+#define TPM_SC_CMOD_INC_PER_CNT		(0x1 << 3)
+#define TPM_SC_CMOD_DIV_DEFAULT		0x3
+#define TPM_CNT				0x14
+#define TPM_MOD				0x18
+#define TPM_STATUS			0x1c
+#define TPM_STATUS_CH0F			BIT(0)
+#define TPM_C0SC			0x20
+#define TPM_C0SC_CHIE			BIT(6)
+#define TPM_C0SC_MODE_SHIFT		2
+#define TPM_C0SC_MODE_MASK		0x3c
+#define TPM_C0SC_MODE_SW_COMPARE	0x4
+#define TPM_C0V				0x24
+
+static void __iomem *timer_base;
+static struct clock_event_device clockevent_tpm;
+
+static inline void tpm_timer_disable(void)
+{
+	unsigned int val;
+
+	/* channel disable */
+	val = readl(timer_base + TPM_C0SC);
+	val &= ~(TPM_C0SC_MODE_MASK | TPM_C0SC_CHIE);
+	writel(val, timer_base + TPM_C0SC);
+}
+
+static inline void tpm_timer_enable(void)
+{
+	unsigned int val;
+
+	/* channel enabled in sw compare mode */
+	val = readl(timer_base + TPM_C0SC);
+	val |= (TPM_C0SC_MODE_SW_COMPARE << TPM_C0SC_MODE_SHIFT) |
+	       TPM_C0SC_CHIE;
+	writel(val, timer_base + TPM_C0SC);
+}
+
+static inline void tpm_irq_acknowledge(void)
+{
+	writel(TPM_STATUS_CH0F, timer_base + TPM_STATUS);
+}
+
+static struct delay_timer tpm_delay_timer;
+
+static inline unsigned long tpm_read_counter(void)
+{
+	return readl(timer_base + TPM_CNT);
+}
+
+static unsigned long tpm_read_current_timer(void)
+{
+	return tpm_read_counter();
+}
+
+static u64 notrace tpm_read_sched_clock(void)
+{
+	return tpm_read_counter();
+}
+
+static int __init tpm_clocksource_init(unsigned long rate)
+{
+	tpm_delay_timer.read_current_timer = &tpm_read_current_timer;
+	tpm_delay_timer.freq = rate;
+	register_current_timer_delay(&tpm_delay_timer);
+
+	sched_clock_register(tpm_read_sched_clock, 32, rate);
+
+	return clocksource_mmio_init(timer_base + TPM_CNT, "imx-tpm",
+				     rate, 200, 32, clocksource_mmio_readl_up);
+}
+
+static int tpm_set_next_event(unsigned long delta,
+				struct clock_event_device *evt)
+{
+	unsigned long next, now;
+
+	next = tpm_read_counter();
+	next += delta;
+	writel(next, timer_base + TPM_C0V);
+	now = tpm_read_counter();
+
+	/*
+	 * NOTE: We observed in a very small probability, the bus fabric
+	 * contention between GPU and A7 may results a few cycles delay
+	 * of writing CNT registers which may cause the min_delta event got
+	 * missed, so we need add a ETIME check here in case it happened.
+	 */
+	return (int)((next - now) <= 0) ? -ETIME : 0;
+}
+
+static int tpm_set_state_oneshot(struct clock_event_device *evt)
+{
+	tpm_timer_enable();
+
+	return 0;
+}
+
+static int tpm_set_state_shutdown(struct clock_event_device *evt)
+{
+	tpm_timer_disable();
+
+	return 0;
+}
+
+static irqreturn_t tpm_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = dev_id;
+
+	tpm_irq_acknowledge();
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static struct clock_event_device clockevent_tpm = {
+	.name			= "i.MX7ULP TPM Timer",
+	.features		= CLOCK_EVT_FEAT_ONESHOT,
+	.set_state_oneshot	= tpm_set_state_oneshot,
+	.set_next_event		= tpm_set_next_event,
+	.set_state_shutdown	= tpm_set_state_shutdown,
+	.rating			= 200,
+};
+
+static int __init tpm_clockevent_init(unsigned long rate, int irq)
+{
+	int ret;
+
+	ret = request_irq(irq, tpm_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
+			  "i.MX7ULP TPM Timer", &clockevent_tpm);
+
+	clockevent_tpm.cpumask = cpumask_of(0);
+	clockevent_tpm.irq = irq;
+	clockevents_config_and_register(&clockevent_tpm,
+					rate, 300, 0xfffffffe);
+
+	return ret;
+}
+
+static int __init tpm_timer_init(struct device_node *np)
+{
+	struct clk *ipg, *per;
+	int irq, ret;
+	u32 rate;
+
+	timer_base = of_iomap(np, 0);
+	if (!timer_base) {
+		pr_err("tpm: failed to get base address\n");
+		return -ENXIO;
+	}
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (!irq) {
+		pr_err("tpm: failed to get irq\n");
+		ret = -ENOENT;
+		goto err_iomap;
+	}
+
+	ipg = of_clk_get_by_name(np, "ipg");
+	per = of_clk_get_by_name(np, "per");
+	if (IS_ERR(ipg) || IS_ERR(per)) {
+		pr_err("tpm: failed to get igp or per clk\n");
+		ret = -ENODEV;
+		goto err_clk_get;
+	}
+
+	/* enable clk before accessing registers */
+	ret = clk_prepare_enable(ipg);
+	if (ret) {
+		pr_err("tpm: ipg clock enable failed (%d)\n", ret);
+		goto err_clk_get;
+	}
+
+	ret = clk_prepare_enable(per);
+	if (ret) {
+		pr_err("tpm: per clock enable failed (%d)\n", ret);
+		goto err_per_clk_enable;
+	}
+
+	/*
+	 * Initialize tpm module to a known state
+	 * 1) Counter disabled
+	 * 2) TPM counter operates in up counting mode
+	 * 3) Timer Overflow Interrupt disabled
+	 * 4) Channel0 disabled
+	 * 5) DMA transfers disabled
+	 */
+	writel(0, timer_base + TPM_SC);
+	writel(0, timer_base + TPM_CNT);
+	writel(0, timer_base + TPM_C0SC);
+
+	/* increase per cnt, div 8 by default */
+	writel(TPM_SC_CMOD_INC_PER_CNT | TPM_SC_CMOD_DIV_DEFAULT,
+		     timer_base + TPM_SC);
+
+	/* set MOD register to maximum for free running mode */
+	writel(0xffffffff, timer_base + TPM_MOD);
+
+	rate = clk_get_rate(per) >> 3;
+	ret = tpm_clocksource_init(rate);
+	if (ret)
+		goto err_per_clk_enable;
+
+	ret = tpm_clockevent_init(rate, irq);
+	if (ret)
+		goto err_per_clk_enable;
+
+	return 0;
+
+err_per_clk_enable:
+	clk_disable_unprepare(ipg);
+err_clk_get:
+	clk_put(per);
+	clk_put(ipg);
+err_iomap:
+	iounmap(timer_base);
+	return ret;
+}
+TIMER_OF_DECLARE(imx7ulp, "fsl,imx7ulp-tpm", tpm_timer_init);
diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
index 4d7aef9d9c15..c79122d8e10d 100644
--- a/drivers/clocksource/timer-of.c
+++ b/drivers/clocksource/timer-of.c
@@ -52,7 +52,7 @@ static __init int timer_irq_init(struct device_node *np,
 		of_irq->irq = irq_of_parse_and_map(np, of_irq->index);
 	}
 	if (!of_irq->irq) {
-		pr_err("Failed to map interrupt for %s\n", np->full_name);
+		pr_err("Failed to map interrupt for %pOF\n", np);
 		return -EINVAL;
 	}
 
@@ -63,8 +63,7 @@ static __init int timer_irq_init(struct device_node *np,
 			    of_irq->flags ? of_irq->flags : IRQF_TIMER,
 			    np->full_name, clkevt);
 	if (ret) {
-		pr_err("Failed to request irq %d for %s\n", of_irq->irq,
-		       np->full_name);
+		pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);
 		return ret;
 	}
 
@@ -88,20 +87,20 @@ static __init int timer_clk_init(struct device_node *np,
 	of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :
 		of_clk_get(np, of_clk->index);
 	if (IS_ERR(of_clk->clk)) {
-		pr_err("Failed to get clock for %s\n", np->full_name);
+		pr_err("Failed to get clock for %pOF\n", np);
 		return PTR_ERR(of_clk->clk);
 	}
 
 	ret = clk_prepare_enable(of_clk->clk);
 	if (ret) {
-		pr_err("Failed for enable clock for %s\n", np->full_name);
+		pr_err("Failed for enable clock for %pOF\n", np);
 		goto out_clk_put;
 	}
 
 	of_clk->rate = clk_get_rate(of_clk->clk);
 	if (!of_clk->rate) {
 		ret = -EINVAL;
-		pr_err("Failed to get clock rate for %s\n", np->full_name);
+		pr_err("Failed to get clock rate for %pOF\n", np);
 		goto out_clk_disable;
 	}
 
diff --git a/drivers/clocksource/timer-probe.c b/drivers/clocksource/timer-probe.c
index da81e5de74fe..028075720334 100644
--- a/drivers/clocksource/timer-probe.c
+++ b/drivers/clocksource/timer-probe.c
@@ -40,8 +40,7 @@ void __init timer_probe(void)
 
 		ret = init_func_ret(np);
 		if (ret) {
-			pr_err("Failed to initialize '%s': %d\n",
-			       of_node_full_name(np), ret);
+			pr_err("Failed to initialize '%pOF': %d\n", np, ret);
 			continue;
 		}
 
diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index 174d1243ea93..8f2423789ba9 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -138,7 +138,7 @@ static int __init stm32_clockevent_init(struct device_node *np)
 	irq = irq_of_parse_and_map(np, 0);
 	if (!irq) {
 		ret = -EINVAL;
-		pr_err("%s: failed to get irq.\n", np->full_name);
+		pr_err("%pOF: failed to get irq.\n", np);
 		goto err_get_irq;
 	}
 
@@ -168,12 +168,12 @@ static int __init stm32_clockevent_init(struct device_node *np)
 	ret = request_irq(irq, stm32_clock_event_handler, IRQF_TIMER,
 			"stm32 clockevent", data);
 	if (ret) {
-		pr_err("%s: failed to request irq.\n", np->full_name);
+		pr_err("%pOF: failed to request irq.\n", np);
 		goto err_get_irq;
 	}
 
-	pr_info("%s: STM32 clockevent driver initialized (%d bits)\n",
-			np->full_name, bits);
+	pr_info("%pOF: STM32 clockevent driver initialized (%d bits)\n",
+			np, bits);
 
 	return ret;