Re: [PATCH 2/2] ARM: dts: renesas: r9a06g032-rzn1d400-eb: enable USB host port

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

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> According to Sections 10.6.5.1 (1) ("Meanings of USB_OCI and USB_PPON
> Signals") and Table 10.131 ("OCI and PPON") of the RZ/N1D System Control
> and Peripheral Manual, USB_PPON2 and USB_OC2 are only used when both
> ports are configured for host mode.  When port 1 is configured for
> function mode, port 2 uses USB_PPON1 and USB_OC1 instead, so you
> shouldn't need pin control for USB_PPON2 and USB_OC2.
> However, that does not match the schematics, which show that USB_PPON2
> and USB_OC2 are wired to port 2's power switch.
> Can you enlighten me?

Both pins I enabled here are routed to the Config CPLD (check the DB
datasheet, page 9). This handles the configuration and routes whatever
is selected to the EB then. The pins on the EB are always named PPON2
and OC2. Because these pins are always routed to the CPLD, I think it
makes sense to have them described like this always. I didn't see
another way to use them anyhow. It could be argued, though, that these
pinmux properties belong to the DB, then. Maybe this makes more sense?


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