counter: stm32-timer-cnt: Provide defines for slave mode selection

The STM32 timer permits configuration of the counter encoder mode via
the slave mode control register (SMCR) slave mode selection (SMS) bits.
This patch provides preprocessor defines for the supported encoder
modes.

Cc: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/ad3d9cd7af580d586316d368f74964cbc394f981.1630031207.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
index 3fb0debd7425d10e14c4185b6f92169371ca3468..1fbc46f4ee66e9d88759d80acc2875993efc6cf9 100644 (file)
--- a/drivers/counter/stm32-timer-cnt.c
+++ b/drivers/counter/stm32-timer-cnt.c
@@ -93,16 +93,16 @@ static int stm32_count_function_get(struct counter_device *counter,
        regmap_read(priv->regmap, TIM_SMCR, &smcr);
 
        switch (smcr & TIM_SMCR_SMS) {
-       case 0:
+       case TIM_SMCR_SMS_SLAVE_MODE_DISABLED:
                *function = STM32_COUNT_SLAVE_MODE_DISABLED;
                return 0;
-       case 1:
+       case TIM_SMCR_SMS_ENCODER_MODE_1:
                *function = STM32_COUNT_ENCODER_MODE_1;
                return 0;
-       case 2:
+       case TIM_SMCR_SMS_ENCODER_MODE_2:
                *function = STM32_COUNT_ENCODER_MODE_2;
                return 0;
-       case 3:
+       case TIM_SMCR_SMS_ENCODER_MODE_3:
                *function = STM32_COUNT_ENCODER_MODE_3;
                return 0;
        default:
@@ -119,16 +119,16 @@ static int stm32_count_function_set(struct counter_device *counter,
 
        switch (function) {
        case STM32_COUNT_SLAVE_MODE_DISABLED:
-               sms = 0;
+               sms = TIM_SMCR_SMS_SLAVE_MODE_DISABLED;
                break;
        case STM32_COUNT_ENCODER_MODE_1:
-               sms = 1;
+               sms = TIM_SMCR_SMS_ENCODER_MODE_1;
                break;
        case STM32_COUNT_ENCODER_MODE_2:
-               sms = 2;
+               sms = TIM_SMCR_SMS_ENCODER_MODE_2;
                break;
        case STM32_COUNT_ENCODER_MODE_3:
-               sms = 3;
+               sms = TIM_SMCR_SMS_ENCODER_MODE_3;
                break;
        default:
                return -EINVAL;

diff --git a/include/linux/mfd/stm32-timers.h b/include/linux/mfd/stm32-timers.h
index f8db83aedb2b598448a3f9749bcedb43c374e0c7..5f5c43fd69ddd8f0059287c6fd591b25bc7042d4 100644 (file)
--- a/include/linux/mfd/stm32-timers.h
+++ b/include/linux/mfd/stm32-timers.h
@@ -82,6 +82,10 @@
 #define MAX_TIM_ICPSC          0x3
 #define TIM_CR2_MMS_SHIFT      4
 #define TIM_CR2_MMS2_SHIFT     20
+#define TIM_SMCR_SMS_SLAVE_MODE_DISABLED       0 /* counts on internal clock when CEN=1 */
+#define TIM_SMCR_SMS_ENCODER_MODE_1            1 /* counts TI1FP1 edges, depending on TI2FP2 level */
+#define TIM_SMCR_SMS_ENCODER_MODE_2            2 /* counts TI2FP2 edges, depending on TI1FP1 level */
+#define TIM_SMCR_SMS_ENCODER_MODE_3            3 /* counts on both TI1FP1 and TI2FP2 edges */
 #define TIM_SMCR_TS_SHIFT      4
 #define TIM_BDTR_BKF_MASK      0xF
 #define TIM_BDTR_BKF_SHIFT(x)  (16 + (x) * 4)