net: mscc: describe the PTP register range

This patch adds support for using the PTP register range, and adds a
description of its registers. This bank is used when configuring PTP.
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mscc/ocelot.h

@@ -23,6 +23,7 @@
 #include "ocelot_sys.h"
 #include "ocelot_qs.h"
 #include "ocelot_tc.h"
+#include "ocelot_ptp.h"
 
 #define PGID_AGGR    64
 #define PGID_SRC     80
@@ -71,6 +72,7 @@ enum ocelot_target {
 	SYS,
 	S2,
 	HSIO,
+	PTP,
 	TARGET_MAX,
 };
 
@@ -343,6 +345,13 @@ enum ocelot_reg {
 	S2_CACHE_ACTION_DAT,
 	S2_CACHE_CNT_DAT,
 	S2_CACHE_TG_DAT,
+	PTP_PIN_CFG = PTP << TARGET_OFFSET,
+	PTP_PIN_TOD_SEC_MSB,
+	PTP_PIN_TOD_SEC_LSB,
+	PTP_PIN_TOD_NSEC,
+	PTP_CFG_MISC,
+	PTP_CLK_CFG_ADJ_CFG,
+	PTP_CLK_CFG_ADJ_FREQ,
 };
 
 enum ocelot_regfield {

drivers/net/ethernet/mscc/ocelot_board.c

@@ -182,6 +182,7 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 	struct {
 		enum ocelot_target id;
 		char *name;
+		u8 optional:1;
 	} res[] = {
 		{ SYS, "sys" },
 		{ REW, "rew" },
@@ -189,6 +190,7 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 		{ ANA, "ana" },
 		{ QS, "qs" },
 		{ S2, "s2" },
+		{ PTP, "ptp", 1 },
 	};
 
 	if (!np && !pdev->dev.platform_data)
@@ -205,8 +207,14 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 		struct regmap *target;
 
 		target = ocelot_io_platform_init(ocelot, pdev, res[i].name);
-		if (IS_ERR(target))
+		if (IS_ERR(target)) {
+			if (res[i].optional) {
+				ocelot->targets[res[i].id] = NULL;
+				continue;
+			}
+
 			return PTR_ERR(target);
+		}
 
 		ocelot->targets[res[i].id] = target;
 	}

drivers/net/ethernet/mscc/ocelot_ptp.h

+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/*
+ * Microsemi Ocelot Switch driver
+ *
+ * License: Dual MIT/GPL
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+
+#ifndef _MSCC_OCELOT_PTP_H_
+#define _MSCC_OCELOT_PTP_H_
+
+#define PTP_PIN_CFG_RSZ			0x20
+#define PTP_PIN_TOD_SEC_MSB_RSZ		PTP_PIN_CFG_RSZ
+#define PTP_PIN_TOD_SEC_LSB_RSZ		PTP_PIN_CFG_RSZ
+#define PTP_PIN_TOD_NSEC_RSZ		PTP_PIN_CFG_RSZ
+
+#define PTP_PIN_CFG_DOM			BIT(0)
+#define PTP_PIN_CFG_SYNC		BIT(2)
+#define PTP_PIN_CFG_ACTION(x)		((x) << 3)
+#define PTP_PIN_CFG_ACTION_MASK		PTP_PIN_CFG_ACTION(0x7)
+
+enum {
+	PTP_PIN_ACTION_IDLE = 0,
+	PTP_PIN_ACTION_LOAD,
+	PTP_PIN_ACTION_SAVE,
+	PTP_PIN_ACTION_CLOCK,
+	PTP_PIN_ACTION_DELTA,
+	PTP_PIN_ACTION_NOSYNC,
+	PTP_PIN_ACTION_SYNC,
+};
+
+#define PTP_CFG_MISC_PTP_EN		BIT(2)
+
+#define PSEC_PER_SEC			1000000000000LL
+
+#define PTP_CFG_CLK_ADJ_CFG_ENA		BIT(0)
+#define PTP_CFG_CLK_ADJ_CFG_DIR		BIT(1)
+
+#define PTP_CFG_CLK_ADJ_FREQ_NS		BIT(30)
+
+#endif

drivers/net/ethernet/mscc/ocelot_regs.c

@@ -234,6 +234,16 @@ static const u32 ocelot_s2_regmap[] = {
 	REG(S2_CACHE_TG_DAT,               0x000388),
 };
 
+static const u32 ocelot_ptp_regmap[] = {
+	REG(PTP_PIN_CFG,                   0x000000),
+	REG(PTP_PIN_TOD_SEC_MSB,           0x000004),
+	REG(PTP_PIN_TOD_SEC_LSB,           0x000008),
+	REG(PTP_PIN_TOD_NSEC,              0x00000c),
+	REG(PTP_CFG_MISC,                  0x0000a0),
+	REG(PTP_CLK_CFG_ADJ_CFG,           0x0000a4),
+	REG(PTP_CLK_CFG_ADJ_FREQ,          0x0000a8),
+};
+
 static const u32 *ocelot_regmap[] = {
 	[ANA] = ocelot_ana_regmap,
 	[QS] = ocelot_qs_regmap,
@@ -241,6 +251,7 @@ static const u32 *ocelot_regmap[] = {
 	[REW] = ocelot_rew_regmap,
 	[SYS] = ocelot_sys_regmap,
 	[S2] = ocelot_s2_regmap,
+	[PTP] = ocelot_ptp_regmap,
 };
 
 static const struct reg_field ocelot_regfields[] = {