board: verdin-am62: improve comment on usb phy core voltage

TI recommends to clear the bit independent of the used voltage.
So the comment which claims to do it due to the core voltage
at 0.85V is bogus.

See https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1252724/am625-usb-phy-core-voltage-selection-and-vdda_core_usb-mismatch

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>

diff --git a/board/toradex/verdin-am62/verdin-am62.c b/board/toradex/verdin-am62/verdin-am62.c
index 2718263eb19b4cbbf513a84fc15e537b357f63db..e948fc16ba9946f22d416e19fb1e5493ced0d618 100644 (file)
--- a/board/toradex/verdin-am62/verdin-am62.c
+++ b/board/toradex/verdin-am62/verdin-am62.c
@@ -102,12 +102,13 @@ void spl_board_init(void)
 {
        u32 val;
 
-       /* Set USB0 PHY core voltage to 0.85V */
+       /* Clear USB0_PHY_CTRL_CORE_VOLTAGE */
+       /* TI recommends to clear the bit independent of VDDA_CORE_USB */
        val = readl(CTRLMMR_USB0_PHY_CTRL);
        val &= ~(CORE_VOLTAGE);
        writel(val, CTRLMMR_USB0_PHY_CTRL);
 
-       /* Set USB1 PHY core voltage to 0.85V */
+       /* Clear USB1_PHY_CTRL_CORE_VOLTAGE */
        val = readl(CTRLMMR_USB1_PHY_CTRL);
        val &= ~(CORE_VOLTAGE);
        writel(val, CTRLMMR_USB1_PHY_CTRL);