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| author |   William Breathitt Gray <wbg@kernel.org> | 2025-03-06 16:05:44 +0900 |
|---|---|---|
| committer | William Breathitt Gray <wbg@kernel.org> | 2025-03-10 18:20:32 +0900 |
| commit | ba27a0247b7187af36cb0b1fe7f7a68067ccb555 (patch) | |
| tree | f173799a173e84dad3c634726f751934dc6811af | |
| parent | counter: Introduce the compare component (diff) | |
| download | linux-rng-ba27a0247b7187af36cb0b1fe7f7a68067ccb555.tar.xz linux-rng-ba27a0247b7187af36cb0b1fe7f7a68067ccb555.zip | |
counter: microchip-tcb-capture: Add support for RC Compare
In Capture mode, the RC register serves as a compare register for the
Timer Counter Channel. When a the Counter Value reaches the RC value, a
RC Compare event occurs (COUNTER_EVENT_THRESHOLD). This patch exposes
the RC register to userspace as the 'compare' Count extension, thus
allowing users to configure the threshold condition for these events.
Acked-by: Bence Csókás <csokas.bence@prolan.hu>
Link: https://lore.kernel.org/r/20250306-introduce-compare-component-v1-2-93993b3dca9c@kernel.org
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
| -rw-r--r-- | drivers/counter/microchip-tcb-capture.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c index aeaee6e0245e..00a463b044b5 100644 --- a/drivers/counter/microchip-tcb-capture.c +++ b/drivers/counter/microchip-tcb-capture.c @@ -302,11 +302,39 @@ static int mchp_tc_count_cap_write(struct counter_device *counter, return ret; } +static int mchp_tc_count_compare_read(struct counter_device *counter, struct counter_count *count, + u64 *val) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + u32 cnt; + int ret; + + ret = regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], RC), &cnt); + if (ret < 0) + return ret; + + *val = cnt; + + return 0; +} + +static int mchp_tc_count_compare_write(struct counter_device *counter, struct counter_count *count, + u64 val) +{ + struct mchp_tc_data *const priv = counter_priv(counter); + + if (val > U32_MAX) + return -ERANGE; + + return regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], RC), val); +} + static DEFINE_COUNTER_ARRAY_CAPTURE(mchp_tc_cnt_cap_array, 2); static struct counter_comp mchp_tc_count_ext[] = { COUNTER_COMP_ARRAY_CAPTURE(mchp_tc_count_cap_read, mchp_tc_count_cap_write, mchp_tc_cnt_cap_array), + COUNTER_COMP_COMPARE(mchp_tc_count_compare_read, mchp_tc_count_compare_write), }; static struct counter_count mchp_tc_counts[] = { |