linux-kernel - [PATCH] counter: microchip-tcb-capture: Add capture extensions for registers RA-RC

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Message-ID: <20250130143817.41625-1-csokas.bence@prolan.hu>
Date: Thu, 30 Jan 2025 15:38:16 +0100
From: Bence Csókás <csokas.bence@...lan.hu>
To: <linux-arm-kernel@...ts.infradead.org>, <linux-iio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Bence Csókás <csokas.bence@...lan.hu>, "Kamel
 Bouhara" <kamel.bouhara@...tlin.com>, William Breathitt Gray <wbg@...nel.org>
Subject: [PATCH] counter: microchip-tcb-capture: Add capture extensions for registers RA-RC

TCB hardware is capable of capturing the timer value to registers RA and
RB. On top, it is capable of triggering on compare against a third
register, RC. Add these registers as extensions.

Signed-off-by: Bence Csókás <csokas.bence@...lan.hu>
---
 drivers/counter/microchip-tcb-capture.c | 58 +++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c
index 2f096a5b973d..524b9edfaa5f 100644
--- a/drivers/counter/microchip-tcb-capture.c
+++ b/drivers/counter/microchip-tcb-capture.c
@@ -247,6 +247,62 @@ static int mchp_tc_count_read(struct counter_device *counter,
 	return 0;
 }
 
+static int mchp_tc_count_cap_read(struct counter_device *counter,
+				  struct counter_count *count, size_t idx, u64 *val)
+{
+	struct mchp_tc_data *const priv = counter_priv(counter);
+	u32 cnt;
+
+	switch (idx) {
+	case 0:
+		regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], RA), &cnt);
+		break;
+	case 1:
+		regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], RB), &cnt);
+		break;
+	case 2:
+		regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], RC), &cnt);
+		break;
+	default:
+		return -EINVAL;
+	}
+	*val = cnt;
+
+	return 0;
+}
+
+static int mchp_tc_count_cap_write(struct counter_device *counter,
+				   struct counter_count *count, size_t idx, u64 val)
+{
+	struct mchp_tc_data *const priv = counter_priv(counter);
+
+	if (val > U32_MAX)
+		return -ERANGE;
+
+	switch (idx) {
+	case 0:
+		regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], RA), val);
+		break;
+	case 1:
+		regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], RB), val);
+		break;
+	case 2:
+		regmap_write(priv->regmap, ATMEL_TC_REG(priv->channel[0], RC), val);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static DEFINE_COUNTER_ARRAY_CAPTURE(mchp_tc_cnt_cap_array, 3);
+
+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),
+};
+
 static struct counter_count mchp_tc_counts[] = {
 	{
 		.id = 0,
@@ -255,6 +311,8 @@ static struct counter_count mchp_tc_counts[] = {
 		.num_functions = ARRAY_SIZE(mchp_tc_count_functions),
 		.synapses = mchp_tc_count_synapses,
 		.num_synapses = ARRAY_SIZE(mchp_tc_count_synapses),
+		.ext = mchp_tc_count_ext,
+		.num_ext = ARRAY_SIZE(mchp_tc_count_ext),
 	},
 };
 
-- 
2.48.1