linux-kernel - [Patch net-next v1 12/12] net: dsa: microchip: ptp: add support for perout programmable pins

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Message-ID: <20221128103227.23171-13-arun.ramadoss@microchip.com>
Date:   Mon, 28 Nov 2022 16:02:27 +0530
From:   Arun Ramadoss <arun.ramadoss@...rochip.com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <woojung.huh@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <andrew@...n.ch>, <vivien.didelot@...il.com>,
        <f.fainelli@...il.com>, <olteanv@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...linux.org.uk>, <Tristram.Ha@...rochip.com>,
        <richardcochran@...il.com>, <ceggers@...i.de>
Subject: [Patch net-next v1 12/12] net: dsa: microchip: ptp: add support for perout programmable pins

There are two programmable pins available for Trigger output unit to
generate periodic pulses. This patch add verify_pin for the available 2
pins and configure it with respect to GPIO index for the TOU unit.

Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
---
Patch v1
- patch is new
---
 drivers/net/dsa/microchip/ksz_ptp.c | 41 +++++++++++++++++++++++++++--
 drivers/net/dsa/microchip/ksz_ptp.h |  3 +++
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c
index 15b863c85cb1..445d220f1a1b 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.c
+++ b/drivers/net/dsa/microchip/ksz_ptp.c
@@ -30,12 +30,14 @@ static int ksz_ptp_tou_gpio(struct ksz_device *dev)
 {
 	int ret;
 
-	ret = ksz_rmw32(dev, REG_SW_GLOBAL_LED_OVR__4, LED_OVR_1, LED_OVR_1);
+	ret = ksz_rmw32(dev, REG_SW_GLOBAL_LED_OVR__4, LED_OVR_1 | LED_OVR_2,
+			LED_OVR_1 | LED_OVR_2);
 	if (ret)
 		return ret;
 
 	return ksz_rmw32(dev, REG_SW_GLOBAL_LED_SRC__4,
-			 LED_SRC_PTP_GPIO_1, LED_SRC_PTP_GPIO_1);
+			 LED_SRC_PTP_GPIO_1 | LED_SRC_PTP_GPIO_2,
+			 LED_SRC_PTP_GPIO_1 | LED_SRC_PTP_GPIO_2);
 }
 
 static int ksz_ptp_tou_reset(struct ksz_device *dev, u8 unit)
@@ -181,6 +183,10 @@ static int ksz_ptp_enable_perout(struct ksz_device *dev,
 	    ptp_data->tou_mode != KSZ_PTP_TOU_IDLE)
 		return -EBUSY;
 
+	pin = ptp_find_pin(ptp_data->clock, PTP_PF_PEROUT, request->index);
+	if (pin < 0)
+		return -EINVAL;
+
 	data32 = FIELD_PREP(PTP_GPIO_INDEX, pin) |
 		 FIELD_PREP(PTP_TOU_INDEX, request->index);
 	ret = ksz_rmw32(dev, REG_PTP_UNIT_INDEX__4,
@@ -708,6 +714,23 @@ static int ksz_ptp_enable(struct ptp_clock_info *ptp,
 	return ret;
 }
 
+static int ksz_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
+			      enum ptp_pin_function func, unsigned int chan)
+{
+	int ret = 0;
+
+	switch (func) {
+	case PTP_PF_NONE:
+	case PTP_PF_PEROUT:
+		break;
+	default:
+		ret = -1;
+		break;
+	}
+
+	return ret;
+}
+
 /*  Function is pointer to the do_aux_work in the ptp_clock capability */
 static long ksz_ptp_do_aux_work(struct ptp_clock_info *ptp)
 {
@@ -824,6 +847,8 @@ static const struct ptp_clock_info ksz_ptp_caps = {
 	.adjtime	= ksz_ptp_adjtime,
 	.do_aux_work	= ksz_ptp_do_aux_work,
 	.enable		= ksz_ptp_enable,
+	.verify		= ksz_ptp_verify_pin,
+	.n_pins		= KSZ_PTP_N_GPIO,
 	.n_per_out	= 3,
 };
 
@@ -832,6 +857,7 @@ int ksz_ptp_clock_register(struct dsa_switch *ds)
 	struct ksz_device *dev = ds->priv;
 	struct ksz_ptp_data *ptp_data;
 	int ret;
+	u8 i;
 
 	ptp_data = &dev->ptp_data;
 	mutex_init(&ptp_data->lock);
@@ -843,6 +869,17 @@ int ksz_ptp_clock_register(struct dsa_switch *ds)
 	if (ret)
 		return ret;
 
+	for (i = 0; i < KSZ_PTP_N_GPIO; i++) {
+		struct ptp_pin_desc *ptp_pin = &ptp_data->pin_config[i];
+
+		snprintf(ptp_pin->name,
+			 sizeof(ptp_pin->name), "ksz_ptp_pin_%02d", i);
+		ptp_pin->index = i;
+		ptp_pin->func = PTP_PF_NONE;
+	}
+
+	ptp_data->caps.pin_config = ptp_data->pin_config;
+
 	ptp_data->clock = ptp_clock_register(&ptp_data->caps, dev->dev);
 	if (IS_ERR_OR_NULL(ptp_data->clock))
 		return PTR_ERR(ptp_data->clock);
diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h
index 94ffd8bc0603..390364a177ea 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.h
+++ b/drivers/net/dsa/microchip/ksz_ptp.h
@@ -10,6 +10,8 @@
 
 #include <linux/ptp_clock_kernel.h>
 
+#define KSZ_PTP_N_GPIO		2
+
 enum ksz_ptp_tou_mode {
 	KSZ_PTP_TOU_IDLE,
 	KSZ_PTP_TOU_PEROUT,
@@ -18,6 +20,7 @@ enum ksz_ptp_tou_mode {
 struct ksz_ptp_data {
 	struct ptp_clock_info caps;
 	struct ptp_clock *clock;
+	struct ptp_pin_desc pin_config[KSZ_PTP_N_GPIO];
 	/* Serializes all operations on the PTP hardware clock */
 	struct mutex lock;
 	/* lock for accessing the clock_time */
-- 
2.36.1