[U-Boot] [PATCH] board: dra71: Fix selection of OPPs

[Lokesh Vutla <lokeshvutla@ti.com>]

As per the DM[1] Dated June 2016–Revised February 2017, Table 5-3,
DRA71 supports the following OPPs for various voltage domains:

VDD_MPU:	OPP_NOM
VDD_CORE:	OPP_NOM
VDD_GPU:	OPP_NOM
VDD_DSPEVE:	OPP_NOM, OPP_HIGH
VDD_IVA:	OPP_NOM, OPP_HIGH

This patch add support for selection of the above OPPs instead of
using OPP_NOM for all voltage domains.

[1] http://www.ti.com/lit/ds/symlink/dra718.pdf

Reported-by: Vishal Mahaveer <vishalm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
---
 board/ti/dra7xx/evm.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/board/ti/dra7xx/evm.c b/board/ti/dra7xx/evm.c
index ae2d59da43..0984475d3b 100644
--- a/board/ti/dra7xx/evm.c
+++ b/board/ti/dra7xx/evm.c
@@ -456,27 +456,44 @@ int get_voltrail_opp(int rail_offset)
 {
 	int opp;
 
-	/*
-	 * DRA71x supports only OPP_NOM.
-	 */
-	if (board_is_dra71x_evm())
-		return OPP_NOM;
-
 	switch (rail_offset) {
 	case VOLT_MPU:
 		opp = DRA7_MPU_OPP;
+		/* DRA71x supports only OPP_NOM for MPU */
+		if (board_is_dra71x_evm())
+			opp = OPP_NOM;
 		break;
 	case VOLT_CORE:
 		opp = DRA7_CORE_OPP;
+		/* DRA71x supports only OPP_NOM for CORE */
+		if (board_is_dra71x_evm())
+			opp = OPP_NOM;
 		break;
 	case VOLT_GPU:
 		opp = DRA7_GPU_OPP;
+		/* DRA71x supports only OPP_NOM for GPU */
+		if (board_is_dra71x_evm())
+			opp = OPP_NOM;
 		break;
 	case VOLT_EVE:
 		opp = DRA7_DSPEVE_OPP;
+		/*
+		 * DRA71x does not support OPP_OD for EVE.
+		 * If OPP_OD is selected by menuconfig, fallback
+		 * to OPP_NOM.
+		 */
+		if (board_is_dra71x_evm() && opp == OPP_OD)
+			opp = OPP_NOM;
 		break;
 	case VOLT_IVA:
 		opp = DRA7_IVA_OPP;
+		/*
+		 * DRA71x does not support OPP_OD for IVA.
+		 * If OPP_OD is selected by menuconfig, fallback
+		 * to OPP_NOM.
+		 */
+		if (board_is_dra71x_evm() && opp == OPP_OD)
+			opp = OPP_NOM;
 		break;
 	default:
 		opp = OPP_NOM;
-- 
2.11.0