misc: k3_avs: add driver for K3 Adaptive Voltage Scaling Class 0

Adaptive Voltage Scaling is a technology used in TI SoCs to optimize
the operating voltage based on characterization data written to efuse
during production. Add a driver to support this feature for K3 line of
SoCs, initially for AM65x.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>

include/k3-avs.h

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments' K3 Adaptive Voltage Scaling driver
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+ *      Tero Kristo <t-kristo@ti.com>
+ *
+ */
+
+#ifndef _K3_AVS0_
+#define _K3_AVS0_
+
+#define AM6_VDD_WKUP		0
+#define AM6_VDD_MCU		1
+#define AM6_VDD_CORE		2
+#define AM6_VDD_MPU0		3
+#define AM6_VDD_MPU1		4
+
+#define NUM_OPPS		4
+
+#define AM6_OPP_NOM		1
+#define AM6_OPP_OD		2
+#define AM6_OPP_TURBO		3
+
+int k3_avs_set_opp(struct udevice *dev, int vdd_id, int opp_id);
+int k3_avs_notify_freq(int dev_id, int clk_id, u32 freq);
+
+#endif