From ba27a0247b7187af36cb0b1fe7f7a68067ccb555 Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Thu, 6 Mar 2025 16:05:44 +0900 Subject: [PATCH] counter: microchip-tcb-capture: Add support for RC Compare MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://lore.kernel.org/r/20250306-introduce-compare-component-v1-2-93993b3dca9c@kernel.org Signed-off-by: William Breathitt Gray --- drivers/counter/microchip-tcb-capture.c | 28 +++++++++++++++++++++++++ 1 file changed, 28 insertions(+) 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[] = { -- 2.47.3