[PATCH v3 1/2] dt-bindings: phy: qcom,usb-hs-phy: add qcom,hs-drv-slope

[Krzysztof Kozlowski]

On Tue, Jun 16, 2026 at 03:26:53PM +0200, Herman van Hazendonk wrote:
> The MSM8x60 / APQ8060 PHY needs three vendor ULPI register tweaks for
> stable USB operation: pre-emphasis level, CDR auto-reset and SE1
> gating in registers 0x32 and 0x36.  A survey of MSM8x60-class
> downstream board files (Qualcomm SURF/FFA/Fluid/Dragon, Samsung
> Galaxy S2 family, Sony Xperia, HTC and HP TouchPad) shows that those
> three values are identical across every reference board and can be
> hardcoded in the driver behind the existing
> qcom,usb-hs-phy-msm8660 compatible.
> 
> The only board-specific value is the 4-bit HS driver slope in bits
> [3:0] of register 0x32:
> 
>   HP TouchPad                                  5
>   HTC MSM8660 ports                            1
>   Qualcomm / Samsung / Sony reference boards   0 (silicon default)
> 
> Add a qcom,hs-drv-slope property carrying that 4-bit value, valid
> only on the qcom,usb-hs-phy-msm8660 variant.  When the property is
> absent the driver leaves the silicon default in place, matching the
> behaviour of the Qualcomm reference platform.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>

Best regards,
Krzysztof