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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 Acked-by: Peter Chen <peter.chen@nxp.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jaret Cantu <jaret.cantu@timesys.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
32 lines
1.2 KiB
Plaintext
32 lines
1.2 KiB
Plaintext
* Freescale MXS USB Phy Device
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Required properties:
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- compatible: should contain:
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* "fsl,imx23-usbphy" for imx23 and imx28
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* "fsl,imx6q-usbphy" for imx6dq and imx6dl
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* "fsl,imx6sl-usbphy" for imx6sl
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* "fsl,vf610-usbphy" for Vybrid vf610
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* "fsl,imx6sx-usbphy" for imx6sx
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"fsl,imx23-usbphy" is still a fallback for other strings
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- reg: Should contain registers location and length
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- interrupts: Should contain phy interrupt
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- fsl,anatop: phandle for anatop register, it is only for imx6 SoC series
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Optional properties:
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- fsl,tx-cal-45-dn-ohms: Integer [30-55]. Resistance (in ohms) of switchable
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high-speed trimming resistor connected in parallel with the 45 ohm resistor
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that terminates the DN output signal. Default: 45
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- fsl,tx-cal-45-dp-ohms: Integer [30-55]. Resistance (in ohms) of switchable
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high-speed trimming resistor connected in parallel with the 45 ohm resistor
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that terminates the DP output signal. Default: 45
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- fsl,tx-d-cal: Integer [79-119]. Current trimming value (as a percentage) of
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the 17.78mA TX reference current. Default: 100
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Example:
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usbphy1: usbphy@020c9000 {
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compatible = "fsl,imx6q-usbphy", "fsl,imx23-usbphy";
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reg = <0x020c9000 0x1000>;
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interrupts = <0 44 0x04>;
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fsl,anatop = <&anatop>;
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};
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