netdev - [PATCH net-next v2 1/2] net:dsa:microchip: add property to select internal RMII reference clock

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Date: Thu, 12 Oct 2023 12:55:55 +0200
From: Ante Knezic <ante.knezic@...mholz.de>
To: <netdev@...r.kernel.org>
CC: <woojung.huh@...rochip.com>, <andrew@...n.ch>, <f.fainelli@...il.com>,
	<olteanv@...il.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>, <marex@...x.de>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Ante Knezic
	<ante.knezic@...mholz.de>
Subject: [PATCH net-next v2 1/2] net:dsa:microchip: add property to select internal RMII reference clock

Microchip KSZ8863/KSZ8873 have the ability to select between internal
and external RMII reference clock. By default, reference clock
needs to be provided via REFCLKI_3 pin. If required, device can be
setup to provide RMII clock internally so that REFCLKI_3 pin can be
left unconnected.
Add a new "microchip,rmii-clk-internal" property which will set
RMII clock reference to internal. If property is not set, reference
clock needs to be provided externally.

Signed-off-by: Ante Knezic <ante.knezic@...mholz.de>
---
 drivers/net/dsa/microchip/ksz8795.c     | 5 +++++
 drivers/net/dsa/microchip/ksz8795_reg.h | 3 +++
 drivers/net/dsa/microchip/ksz_common.c  | 3 +++
 drivers/net/dsa/microchip/ksz_common.h  | 1 +
 4 files changed, 12 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 91aba470fb2f..78f3a668aa99 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -1434,6 +1434,11 @@ int ksz8_setup(struct dsa_switch *ds)
 	for (i = 0; i < (dev->info->num_vlans / 4); i++)
 		ksz8_r_vlan_entries(dev, i);
 
+	if (ksz_is_ksz88x3(dev))
+		ksz_cfg(dev, KSZ88X3_REG_FVID_AND_HOST_MODE,
+			KSZ88X3_PORT3_RMII_CLK_INTERNAL,
+			dev->rmii_clk_internal);
+
 	return ksz8_handle_global_errata(ds);
 }
 
diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h
index 3c9dae53e4d8..beca974e0171 100644
--- a/drivers/net/dsa/microchip/ksz8795_reg.h
+++ b/drivers/net/dsa/microchip/ksz8795_reg.h
@@ -22,6 +22,9 @@
 #define KSZ8863_GLOBAL_SOFTWARE_RESET	BIT(4)
 #define KSZ8863_PCS_RESET		BIT(0)
 
+#define KSZ88X3_REG_FVID_AND_HOST_MODE  0xC6
+#define KSZ88X3_PORT3_RMII_CLK_INTERNAL BIT(3)
+
 #define REG_SW_CTRL_0			0x02
 
 #define SW_NEW_BACKOFF			BIT(7)
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index b800ace40ce1..0a0a53ce5b1b 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -4160,6 +4160,9 @@ int ksz_switch_register(struct ksz_device *dev)
 		}
 	}
 
+	dev->rmii_clk_internal = of_property_read_bool(dev->dev->of_node,
+						       "microchip,rmii-clk-internal");
+
 	ret = dsa_register_switch(dev->ds);
 	if (ret) {
 		dev->dev_ops->exit(dev);
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 8842efca0871..e5b0445fe2ca 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -163,6 +163,7 @@ struct ksz_device {
 	phy_interface_t compat_interface;
 	bool synclko_125;
 	bool synclko_disable;
+	bool rmii_clk_internal;
 
 	struct vlan_table *vlan_cache;
 
-- 
2.11.0