[PATCH 2/3] Change to cyclecounter for GPT input capture. Add support for i.MX8MM.

[Kane Jiang <jian.jiang@nxp.com>]

Modify the timestamp to cyclecounter in i.MX GPT driver
for input capture function.
Add compatible support for NXP i.MX8MM chip in driver.

Signed-off-by: Kane Jiang <jian.jiang@nxp.com>
---
 drivers/clocksource/timer-imx-gpt.c | 11 +++++++----
 include/linux/mxc_icap.h            |  2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/clocksource/timer-imx-gpt.c b/drivers/clocksource/timer-imx-gpt.c
index c6aa1462e441..816bf4e123c3 100644
--- a/drivers/clocksource/timer-imx-gpt.c
+++ b/drivers/clocksource/timer-imx-gpt.c
@@ -417,22 +417,23 @@ static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
 
 	for (i = 0; i < 2; i++) {
 		struct icap_channel *ic = &icap_channel[i];
-		ktime_t timestamp;
+		u64 cyclecounter;
 
 		if (!imxtm->gpt->gpt_is_ic_irq(ic, tstat))
 			continue;
 
 		imxtm->gpt->gpt_ic_irq_acknowledge(ic);
 
-		timestamp = ns_to_ktime(timecounter_read(&ic->tc));
+		cyclecounter = ic->cc.read(&ic->cc);
 
 		if (ic->handler)
-			ic->handler(ic->chan, ic->dev_id, timestamp);
+			ic->handler(ic->chan, ic->dev_id, cyclecounter);
 	}
 
 	if (imxtm->gpt->gpt_is_oc_irq(imxtm, tstat)) {
 		imxtm->gpt->gpt_oc_irq_acknowledge(imxtm);
-		ced->event_handler(ced);
+		if (ced->event_handler)
+			ced->event_handler(ced);
 	}
 
 	return IRQ_HANDLED;
@@ -802,6 +803,7 @@ static const struct of_device_id timer_of_match[] = {
 	{ .compatible = "fsl,imx6dl-gpt" },
 	{ .compatible = "fsl,imx6sl-gpt" },
 	{ .compatible = "fsl,imx6sx-gpt" },
+	{ .compatible = "fsl,imx8mm-gpt" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, timer_of_match);
@@ -901,3 +903,4 @@ TIMER_OF_DECLARE(imx6q_timer, "fsl,imx6q-gpt", imx31_timer_init_dt);
 TIMER_OF_DECLARE(imx6dl_timer, "fsl,imx6dl-gpt", imx6dl_timer_init_dt);
 TIMER_OF_DECLARE(imx6sl_timer, "fsl,imx6sl-gpt", imx6dl_timer_init_dt);
 TIMER_OF_DECLARE(imx6sx_timer, "fsl,imx6sx-gpt", imx6dl_timer_init_dt);
+TIMER_OF_DECLARE(imx8mm_timer, "fsl,imx8mm-gpt", imx6dl_timer_init_dt);
diff --git a/include/linux/mxc_icap.h b/include/linux/mxc_icap.h
index fa5ffdf3b589..292c15b6b028 100644
--- a/include/linux/mxc_icap.h
+++ b/include/linux/mxc_icap.h
@@ -7,7 +7,7 @@
 #ifndef __MXC_ICAP_H__
 #define __MXC_ICAP_H__
 
-typedef void (*mxc_icap_handler_t)(int, void *, ktime_t);
+typedef void (*mxc_icap_handler_t)(int, void *, u64);
 
 int mxc_request_input_capture(unsigned int chan, mxc_icap_handler_t handler,
 			      unsigned long capflags, void *dev_id);
-- 
2.25.1