diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 177b771..119ba07 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -521,7 +521,6 @@
 
 config CRYPTO_DEV_ATMEL_ECC
 	tristate "Support for Microchip / Atmel ECC hw accelerator"
-	depends on ARCH_AT91 || COMPILE_TEST
 	depends on I2C
 	select CRYPTO_ECDH
 	select CRC16
diff --git a/drivers/crypto/atmel-ecc.c b/drivers/crypto/atmel-ecc.c
index ba00e45..5705348 100644
--- a/drivers/crypto/atmel-ecc.c
+++ b/drivers/crypto/atmel-ecc.c
@@ -657,11 +657,14 @@ static int atmel_ecc_probe(struct i2c_client *client,
 		return -ENODEV;
 	}
 
-	ret = of_property_read_u32(client->adapter->dev.of_node,
-				   "clock-frequency", &bus_clk_rate);
-	if (ret) {
-		dev_err(dev, "of: failed to read clock-frequency property\n");
-		return ret;
+	clk_rate = i2c_acpi_find_bus_speed(&client->adapter->dev);
+	if (!clk_rate) {
+		ret = device_property_read_u32(&client->adapter->dev,
+					       "clock-frequency", &bus_clk_rate);
+		if (ret) {
+			dev_err(dev, "failed to read clock-frequency property\n");
+			return ret;
+		}
 	}
 
 	if (bus_clk_rate > 1000000L) {