net: pse-pd: pd692x0: support disabling disable ports GPIO

Microchip PSE controllers have a dedicated disable ports input that like it
name says disables PoE on all ports.

So lets support parsing that GPIO and using the GPIO flags to set it low
by default and enable PoE on all ports during probe.

Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20260607165600.1260210-2-robert.marko@sartura.hr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/pse-pd/pd692x0.c b/drivers/net/pse-pd/pd692x0.c
index 49b1527829ad9824e22081469387e5e9d9456703..cb377d5ba7afafa5e2313b7a7c9dcdcb79c6a7e7 100644 (file)
--- a/drivers/net/pse-pd/pd692x0.c
+++ b/drivers/net/pse-pd/pd692x0.c
@@ -7,6 +7,7 @@
 
 #include <linux/delay.h>
 #include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -1757,6 +1758,7 @@ static int pd692x0_i2c_probe(struct i2c_client *client)
        static const char * const regulators[] = { "vdd", "vdda" };
        struct pd692x0_msg msg, buf = {0}, zero = {0};
        struct device *dev = &client->dev;
+       struct gpio_desc *disable_ports;
        struct pd692x0_msg_ver ver;
        struct pd692x0_priv *priv;
        struct fw_upload *fwl;
@@ -1780,6 +1782,11 @@ static int pd692x0_i2c_probe(struct i2c_client *client)
        priv->client = client;
        i2c_set_clientdata(client, priv);
 
+       disable_ports = devm_gpiod_get_optional(dev, "disable-ports", GPIOD_OUT_LOW);
+       if (IS_ERR(disable_ports))
+               return dev_err_probe(&client->dev, PTR_ERR(disable_ports),
+                                    "Failed to get disable ports GPIO\n");
+
        ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf));
        if (ret != sizeof(buf)) {
                dev_err(dev, "Failed to get device status\n");