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

Arun Ramadoss
2022-11-28T10:36:01Z

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@microchip.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