Subject: [PATCH net-next 1/6] net: stmmac: add platform library

From: "Russell King (Oracle)" <[email-masked]>
Date: Mon, 11 Sep 2023 16:28:40 +0100

Add a platform library of helper functions for common traits in the
platform drivers. Currently, this is setting the tx clock.

Signed-off-by: Russell King (Oracle) <[email-masked]>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile  |  2 +-
 .../ethernet/stmicro/stmmac/stmmac_plat_lib.c | 29 +++++++++++++++++++
 .../ethernet/stmicro/stmmac/stmmac_plat_lib.h |  8 +++++
 3 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.h

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 5b57aee19267..ba2cbfa0c9d1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -6,7 +6,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 	      mmc_core.o stmmac_hwtstamp.o stmmac_ptp.o dwmac4_descs.o	\
 	      dwmac4_dma.o dwmac4_lib.o dwmac4_core.o dwmac5.o hwif.o \
 	      stmmac_tc.o dwxgmac2_core.o dwxgmac2_dma.o dwxgmac2_descs.o \
-	      stmmac_xdp.o \
+	      stmmac_xdp.o stmmac_plat_lib.o \
 	      $(stmmac-y)
 
 stmmac-$(CONFIG_STMMAC_SELFTESTS) += stmmac_selftests.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c
new file mode 100644
index 000000000000..abb9f512bb0e
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.c
@@ -0,0 +1,29 @@
+#include <linux/stmmac.h>
+#include <linux/clk.h>
+
+#include "stmmac_plat_lib.h"
+
+int dwmac_set_tx_clk_gmii(struct clk *tx_clk, int speed)
+{
+	unsigned long rate;
+
+	switch (speed) {
+	case SPEED_1000:
+		rate = 125000000;
+		break;
+
+	case SPEED_100:
+		rate = 25000000;
+		break;
+
+	case SPEED_10:
+		rate = 2500000;
+		break;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return clk_set_rate(tx_clk, rate);
+}
+EXPORT_SYMBOL_GPL(dwmac_set_tx_clk_gmii);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.h
new file mode 100644
index 000000000000..926fdce379b3
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_plat_lib.h
@@ -0,0 +1,8 @@
+#ifndef STMMAC_PLAT_LIB_H
+#define STMMAC_PLAT_LIB_H
+
+struct clk;
+
+int dwmac_set_tx_clk_gmii(struct clk *tx_clk, int speed);
+
+#endif
-- 
2.30.2