[PATCH v1 1/4] board: verdin-am62: improve comment on usb phy core voltage
Max Krummenacher
max.oss.09 at gmail.com
Wed Jan 17 11:16:46 CET 2024
From: Max Krummenacher <max.krummenacher at toradex.com>
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 at toradex.com>
---
board/toradex/verdin-am62/verdin-am62.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/board/toradex/verdin-am62/verdin-am62.c b/board/toradex/verdin-am62/verdin-am62.c
index d09dda5bccc..4e912b5f32f 100644
--- a/board/toradex/verdin-am62/verdin-am62.c
+++ b/board/toradex/verdin-am62/verdin-am62.c
@@ -101,12 +101,13 @@ 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);
--
2.42.0
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