Re: [PATCH] usb: phy: mxs: Add DT bindings to configure TX settings
From: Rob Herring <hidden>
Date: 2016-08-18 19:27:14
On Tue, Aug 16, 2016 at 06:31:48PM -0400, Jaret Cantu wrote:
The TX settings can be calibrated for particular hardware. The phy is reset by Linux, so this cannot be handled by the bootloader. The TRM mentions that the maximum resistance should be used for the DN/DP calibration in order to pass USB certification. The values for the TX registers are poorly described in the TRM. The meanings of the register values were taken from another NXP-provided document: https://community.nxp.com/message/566147#comment-566912 Signed-off-by: Jaret Cantu <redacted> --- v4. Corrected tx-d-cal register value by rounding up. Changed Freescale web site reference to NXP. v3. Added unit suffix (-ohms) to tx-cal-45-d* v2. Copying devicetree list Removed prettifying extra whitespace Removed unnecessary register rewrite on resume Use min and max constants for clarity .../devicetree/bindings/phy/mxs-usb-phy.txt | 10 ++++
Acked-by: Rob Herring <redacted>
drivers/usb/phy/phy-mxs-usb.c | 61 ++++++++++++++++++++ 2 files changed, 71 insertions(+)
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