Hi Yoshihiro,
On 21 July 2022 13:51 Yoshihiro Shimoda wrote:
> > From: Geert Uytterhoeven, Sent: Thursday, July 21, 2022 9:43 PM
> > On Thu, Jul 21, 2022 at 2:25 PM Phil Edworthy wrote:
> > > On 21 July 2022 13:10 Geert Uytterhoeven wrote:
> > > > On Mon, Jul 18, 2022 at 3:45 PM Phil Edworthy wrote:
> > > > > RZ/V2M (r9a09g011) has a few differences:
> > > > > - The USB3_DRD_CON register has moved, its called
> USB_PERI_DRD_CON in
> > > > > the RZ/V2M hardware manual.
> > > > > It has additional bits for host and peripheral reset that need
> to
> > > > > cleared to use usb host and peripheral respectively.
> > > > > - The USB3_OTG_STA, USB3_OTG_INT_STA and USB3_OTG_INT_ENA
> registers
> > > > > have been moved and renamed to USB_PERI_DRD_STA,
> USB_PERI_DRD_INT_STA
> > > > > and USB_PERI_DRD_INT_E.
> > > > > - The IDMON bit used in the above regs for role detection have
> moved
> > > > > from bit 4 to bit 0.
> > > > > - RZ/V2M has an separate interrupt for DRD, i.e. for changes to
> IDMON.
> > > > > - There are reset lines for DRD and USBP
> > > > > - There is another clock, managed by runtime PM.
> > > > >
> > > > > Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> > > > > Reviewed-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > > >
> > > > Thanks for your patch!
> > > >
> > > > > --- a/drivers/usb/gadget/udc/renesas_usb3.c
> > > > > +++ b/drivers/usb/gadget/udc/renesas_usb3.c
> > > >
> > > > > @@ -363,6 +368,7 @@ struct renesas_usb3 {
> > > > > bool forced_b_device;
> > > > > bool start_to_connect;
> > > > > bool role_sw_by_connector;
> > > > > + bool r9a09g011;
> > > >
> > > > Any better name for this feature flag?
> > > Nothing springs to mind. We could use separate flags for has_resets,
> > > has_drd_irq, max_nr_pipes but I am struggling to come up with names
> > > for the offset registers and moved bits. Any suggestions?
> >
> > OK, so "is_rzv2m"?
>
> The flag name looks good to me. However, I don't like the following usage
> in macros.
> ---
> -#define USB3_DRD_CON 0x218
> +#define USB3_DRD_CON (usb3->r9a09g011 ? 0x400 : 0x218)
> ...
> -#define USB_OTG_IDMON BIT(4)
> +#define USB_OTG_IDMON (usb3->r9a09g011 ? BIT(0) : BIT(4))
> ----
>
> About registers' offset/bit, I think having specific members into
> a new struct is better like below. But, what do you think?
>
> struct renesas_usb3_reg {
> u16 drd_con_offset;
> ...
> u32 otg_idmon_bit;
> ...
> };
>
> struct renesas_usb3 {
> ...
> struct renesas_usb3_reg regs;
> ...
> };
I think that might be a bit overly complex for the problem.
How about:
#define USB3_DRD_CON(p) ((p)->is_rzv2m ? 0x400 : 0x218)
Thanks
Phil
