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counter: microchip-tcb-capture: Add support for RC Compare

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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>
This commit is contained in:
William Breathitt Gray 2025-03-06 16:05:44 +09:00
parent b519820193
commit ba27a0247b
1 changed files with 28 additions and 0 deletions
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28
drivers/counter/microchip-tcb-capture.c
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@ -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[] = {