[PATCH 07/10 (v2)] bcm63xx: clarify meaning of the magical value in ohci-bcm63xx.c

[Maxime Bizon <mbizon@freebox.fr>]

USB maintainer asked for clarification  of the magic value used during
USB init. Be clear about the source of it.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
---
 drivers/usb/host/ohci-bcm63xx.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/host/ohci-bcm63xx.c b/drivers/usb/host/ohci-bcm63xx.c
index d48c8ac..668808e 100644
--- a/drivers/usb/host/ohci-bcm63xx.c
+++ b/drivers/usb/host/ohci-bcm63xx.c
@@ -85,7 +85,11 @@ static int __devinit ohci_hcd_bcm63xx_drv_probe(struct 
platform_device *pdev)
                reg &= ~USBH_PRIV_SWAP_OHCI_ENDN_MASK;
                reg |= USBH_PRIV_SWAP_OHCI_DATA_MASK;
                bcm_rset_writel(RSET_USBH_PRIV, reg, USBH_PRIV_SWAP_REG);
-               /* don't ask... */
+               /*
+                * The magic value comes for the original vendor BSP
+                * and is needed for USB to work. Datasheet does not
+                * help, so the magic value is used as-is.
+                */
                bcm_rset_writel(RSET_USBH_PRIV, 0x1c0020, USBH_PRIV_TEST_REG);
        } else
                return 0;
-- 
1.6.0.4