linux-kernel - [PATCH 3/4] mfd: stm32-timers: Drop TIM_DIER_CC_IE(x) in favour of TIM_DIER

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Date: Fri, 14 Jun 2024 10:10:13 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
	William Breathitt Gray <wbg@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Lee Jones <lee@...nel.org>
Cc: linux-iio@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] mfd: stm32-timers: Drop TIM_DIER_CC_IE(x) in favour of TIM_DIER_CCxIE(x)

These two defines have the same purpose and this change doesn't
introduce any differences in drivers/counter/stm32-timer-cnt.o.

The only difference between the two is that

	TIM_DIER_CC_IE(1) == TIM_DIER_CC2IE

while

	TIM_DIER_CCxIE(1) == TIM_DIER_CC1IE

. That makes it necessary to have an explicit "+ 1" in the user code,
but IMHO this is a good thing as this is the code locatation that
"knows" that for software channel 1 you have to use TIM_DIER_CC2IE
(because software guys start counting at 0, while the relevant hardware
designer started at 1).

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...libre.com>
---
 drivers/counter/stm32-timer-cnt.c | 4 ++--
 include/linux/mfd/stm32-timers.h  | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
index 0664ef969f79..186e73d6ccb4 100644
--- a/drivers/counter/stm32-timer-cnt.c
+++ b/drivers/counter/stm32-timer-cnt.c
@@ -465,7 +465,7 @@ static int stm32_count_events_configure(struct counter_device *counter)
 			ret = stm32_count_capture_configure(counter, event_node->channel, true);
 			if (ret)
 				return ret;
-			dier |= TIM_DIER_CC_IE(event_node->channel);
+			dier |= TIM_DIER_CCxIE(event_node->channel + 1);
 			break;
 		default:
 			/* should never reach this path */
@@ -478,7 +478,7 @@ static int stm32_count_events_configure(struct counter_device *counter)
 
 	/* check for disabled capture events */
 	for (i = 0 ; i < priv->nchannels; i++) {
-		if (!(dier & TIM_DIER_CC_IE(i))) {
+		if (!(dier & TIM_DIER_CCxIE(i + 1))) {
 			ret = stm32_count_capture_configure(counter, i, false);
 			if (ret)
 				return ret;
diff --git a/include/linux/mfd/stm32-timers.h b/include/linux/mfd/stm32-timers.h
index 92b45a559656..f09ba598c97a 100644
--- a/include/linux/mfd/stm32-timers.h
+++ b/include/linux/mfd/stm32-timers.h
@@ -47,7 +47,6 @@
 #define TIM_DIER_CC2IE		TIM_DIER_CCxIE(2)			/* CC2 Interrupt Enable				*/
 #define TIM_DIER_CC3IE		TIM_DIER_CCxIE(3)			/* CC3 Interrupt Enable				*/
 #define TIM_DIER_CC4IE		TIM_DIER_CCxIE(4)			/* CC4 Interrupt Enable				*/
-#define TIM_DIER_CC_IE(x)	BIT((x) + 1)				/* CC1, CC2, CC3, CC4 interrupt enable		*/
 #define TIM_DIER_UDE		BIT(8)					/* Update DMA request Enable			*/
 #define TIM_DIER_CCxDE(x)	BIT(9 + ((x) - 1))			/* CCx DMA request Enable (x ∈ {1, .. 4})	*/
 #define TIM_DIER_CC1DE		TIM_DIER_CCxDE(1)			/* CC1 DMA request Enable			*/
-- 
2.43.0