Hi Stefan,
I hate to be fussy about this, but I don't think I saw a reply
to my earlier comment about the term "USB PHY".
https://lists.denx.de/pipermail/u-boot/2017-September/305123.html
Since i.MX6 SoCs have USB **Host** Phy's as well as the USB OTG Phy,
this patch is a bit misleading.
There's no reference to OTG anywhere in this or patch 2.
On 09/12/2017 04:54 PM, Stefan Agner wrote:
From: Stefan Agner <stefan.ag...@toradex.com>
This macro allows to detect whether the USB PHY is active. This
is helpful to detect if the boot ROM has previously started the
USB serial downloader.
The idea is taken from the mfgtool support in the NXP U-Boot:
http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/?h=imx_v2016.03_4.1.15_2.0.0_ga&id=a352ed3c5184b95c4c9f7468f5fbb5f43de5e412
Signed-off-by: Stefan Agner <stefan.ag...@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswi...@toradex.com>
Tested-by: Fabio Estevam <fabio.este...@nxp.com>
---
Changes in v3: None
Changes in v2:
- Move macro to sys_proto.h
- Renamed from is_boot_from_usb() to is_usbphy_active()
- Use defines for register offset and field
- Remove tab after define
- Remove comment since the actual "magic" is happening and
documented at usage side
arch/arm/include/asm/arch-mx6/sys_proto.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h
b/arch/arm/include/asm/arch-mx6/sys_proto.h
index 14f5d948c9..9d4b1d6768 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -6,3 +6,10 @@
*/
#include <asm/mach-imx/sys_proto.h>
+
+#define USBPHY_PWD 0x00000000
+
+#define USBPHY_PWD_RXPWDRX (1 << 20) /* receiver block power down */
+
+#define is_usbphy_active(void) (!(readl(USB_PHY0_BASE_ADDR + USBPHY_PWD) & \
+ USBPHY_PWD_RXPWDRX))
Regards,
Eric
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