board: ti: dra7xx: Select MCAN instead of DCAN on DRA76 EVM

MCAN can be accessed via DCAN1 or DCAN2. Determining which DCAN instance
to use if any at all is done through
CTRL_CORE_CONTROL_SPARE_RW.SEL_ALT_MCAN. Since general pinmuxing is
handled in U-boot. Handle this additional pinmuxing requirement in U-boot
to ensure that MCAN is used by default via the DCAN1 pins.

Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
[fcooper@ti.com: Update commit message and use DCAN1 not DCAN2 for MCAN]
Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

arch/arm/include/asm/arch-omap5/mux_dra7xx.h

@@ -351,4 +351,7 @@
 #define NMIN_DSP	0x460
 #define RSTOUTN		0x464
 
+#define MCAN_SEL_ALT_MASK	0x6000
+#define MCAN_SEL		0x2000
+
 #endif /* _MUX_DRA7XX_H_ */

board/ti/dra7xx/evm.c

@@ -823,6 +823,11 @@ void recalibrate_iodelay(void)
 		do_set_mux32((*ctrl)->control_padconf_core_base,
 			     delta_pads, delta_npads);
 
+	if (is_dra76x())
+		/* Set mux for MCAN instead of DCAN1 */
+		clrsetbits_le32((*ctrl)->control_core_control_spare_rw,
+				MCAN_SEL_ALT_MASK, MCAN_SEL);
+
 	/* Setup IOdelay configuration */
 	ret = do_set_iodelay((*ctrl)->iodelay_config_base, iodelay, niodelays);
 err: