[PATCH 1/6] board: ti: am62x: Add basic initialization for 32k crystal

[Vishal Mahaveer]

Do the basic configuration required for enabling the 32k crystal. If
external 32k source is not used, 32k rc-osc comes into play, which is
accurate to +-20%.

Signed-off-by: Vishal Mahaveer <vishalm at ti.com>
---
 board/ti/am62x/evm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/board/ti/am62x/evm.c b/board/ti/am62x/evm.c
index e9eba57eba7..7a820cc8c07 100644
--- a/board/ti/am62x/evm.c
+++ b/board/ti/am62x/evm.c
@@ -137,13 +137,26 @@ int board_late_init(void)
 #endif
 
 #if defined(CONFIG_XPL_BUILD)
+#if IS_ENABLED(CONFIG_SPL_BOARD_INIT)
 void spl_board_init(void)
 {
+	u32 val;
+
+	/* We have 32k crystal, so lets enable it */
+	val = readl(MCU_CTRL_LFXOSC_CTRL);
+	val &= ~(MCU_CTRL_LFXOSC_32K_DISABLE_VAL);
+	writel(val, MCU_CTRL_LFXOSC_CTRL);
+	/* Add any TRIM needed for the crystal here.. */
+	/* Make sure to mux up to take the SoC 32k from the crystal */
+	writel(MCU_CTRL_DEVICE_CLKOUT_LFOSC_SELECT_VAL,
+	       MCU_CTRL_DEVICE_CLKOUT_32K_CTRL);
+
 	enable_caches();
 	if (IS_ENABLED(CONFIG_SPL_SPLASH_SCREEN) && IS_ENABLED(CONFIG_SPL_BMP))
 		splash_display();
 
 }
+#endif
 
 void spl_perform_board_fixups(struct spl_image_info *spl_image)
 {
-- 
2.34.1