counter: stm32-timer-cnt: probe number of channels from registers

Probe the number of capture compare channels, by writing CCER register bits
and read them back. Take care to restore the register original value.

This is a precursor patch to support capture channels.

Reviewed-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20240307133306.383045-9-fabrice.gasnier@foss.st.com
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>

diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
index f63d0c3e3f229b3aee08f3f17c717c2692992b97..e1c0a502b74c0ad36888f34425fc1460dbc937e5 100644 (file)
--- a/drivers/counter/stm32-timer-cnt.c
+++ b/drivers/counter/stm32-timer-cnt.c
@@ -42,6 +42,7 @@ struct stm32_timer_cnt {
        bool enabled;
        struct stm32_timer_regs bak;
        bool has_encoder;
+       unsigned int nchannels;
 };
 
 static const enum counter_function stm32_count_functions[] = {
@@ -416,6 +417,20 @@ static struct counter_count stm32_counts = {
        .num_ext = ARRAY_SIZE(stm32_count_ext)
 };
 
+static void stm32_timer_cnt_detect_channels(struct device *dev,
+                                           struct stm32_timer_cnt *priv)
+{
+       u32 ccer, ccer_backup;
+
+       regmap_read(priv->regmap, TIM_CCER, &ccer_backup);
+       regmap_set_bits(priv->regmap, TIM_CCER, TIM_CCER_CCXE);
+       regmap_read(priv->regmap, TIM_CCER, &ccer);
+       regmap_write(priv->regmap, TIM_CCER, ccer_backup);
+       priv->nchannels = hweight32(ccer & TIM_CCER_CCXE);
+
+       dev_dbg(dev, "has %d cc channels\n", priv->nchannels);
+}
+
 /* encoder supported on TIM1 TIM2 TIM3 TIM4 TIM5 TIM8 */
 #define STM32_TIM_ENCODER_SUPPORTED    (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(7))
 
@@ -484,6 +499,8 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       stm32_timer_cnt_detect_channels(dev, priv);
+
        counter->name = dev_name(dev);
        counter->parent = dev;
        counter->ops = &stm32_timer_cnt_ops;