Add a helper function for setting the transmit clock for GMII
interfaces. This handles 1G, 100M and 10M using the standard clock
rates of 125MHz, 25MHz and 2.5MHz.
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
---
.../ethernet/stmicro/stmmac/stmmac_platform.c | 25 +++++++++++++++++++
.../ethernet/stmicro/stmmac/stmmac_platform.h | 1 +
2 files changed, 26 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 0f28795e581c..f7635ed2b255 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -700,6 +700,31 @@ EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
EXPORT_SYMBOL_GPL(devm_stmmac_probe_config_dt);
EXPORT_SYMBOL_GPL(stmmac_remove_config_dt);
+int stmmac_set_tx_clk_gmii(struct clk *tx_clk, unsigned 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(stmmac_set_tx_clk_gmii);
+
int stmmac_get_platform_resources(struct platform_device *pdev,
struct stmmac_resources *stmmac_res)
{
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
index c5565b2a70ac..8dc2287c6724 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
@@ -11,6 +11,7 @@
#include "stmmac.h"
+int stmmac_set_tx_clk_gmii(struct clk *tx_clk, unsigned int speed);
struct plat_stmmacenet_data *
stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac);
struct plat_stmmacenet_data *
--
2.30.2
