net: ti: icss-iep: Reject perout generation request

IEP driver supports both perout and pps signal generation
but perout feature is faulty with half-cooked support
due to some missing configuration. Remove perout
support from the driver and reject perout requests with
"not supported" error code.

Fixes: c1e0230 ("net: ti: icss-iep: Add IEP driver")
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://patch.msgid.link/20250227092441.1848419-1-m-malladi@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: MeghanaMalladiTI

drivers/net/ethernet/ti/icssg/icss_iep.c

@@ -474,26 +474,7 @@ static int icss_iep_perout_enable_hw(struct icss_iep *iep,
 static int icss_iep_perout_enable(struct icss_iep *iep,
 				  struct ptp_perout_request *req, int on)
 {
-	int ret = 0;
-
-	mutex_lock(&iep->ptp_clk_mutex);
-
-	if (iep->pps_enabled) {
-		ret = -EBUSY;
-		goto exit;
-	}
-
-	if (iep->perout_enabled == !!on)
-		goto exit;
-
-	ret = icss_iep_perout_enable_hw(iep, req, on);
-	if (!ret)
-		iep->perout_enabled = !!on;
-
-exit:
-	mutex_unlock(&iep->ptp_clk_mutex);
-
-	return ret;
+	return -EOPNOTSUPP;
 }
 
 static void icss_iep_cap_cmp_work(struct work_struct *work)