On 11/21/2017 3:06 PM, Rob Herring wrote: [..] >> I like where you are going with this. Are you saying that I could read for a >> device property read from firmware (for DTB or ACPI) like DWC3 does for >> "snps,hird-threshold"? > > Is that for the same thing? If so, drop the vendor prefix and use > that. Otherwise, a separate property should really be something that > is per board rather than per SoC. I don't think that's exactly the same property, but it's the same idea I would prefer to go with. That way, an integer can be passed in via the firmware tables. > >> If you mean this, where do you recommend I store the >> desired IRQ_CONTROL value - in struct xhci_hcd ? > > No idea. > >> Or by "compatible" strings, did you mean storing hard-coded values in the >> of_device_id usb_xhci_of_match[] array? This would still be hard-coding (which I >> would like to avoid) and also would not work for the ACPI case. > > ACPI has match tables too? > Yes, you can use DSD in a way that is similar to OF properties > It would only be hardcoded per compatible which should be per SoC. Do > you need per board/device tuning? If so, use a property. > The reason why I think it should dynamic via firmware tables is that * It's much less invasive for vendors to update their DT tables if they need to adjust on a per device/controller/family/etc basis then to adjust a properties table in xhci-plat * This would lead to less polluting in xhci-plat code > Rob > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > I will provide an updated proposed patch sometime this week. I also hope to get some feedback from Mathias to see what he prefers. Thanks again for the feedback Rob. -- Adam Wallis Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
