Re: [PATCH v2 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC

Lee Jones
2014-07-22T15:56:55Z

On Tue, 22 Jul 2014, Felipe Balbi wrote:

> On Tue, Jul 22, 2014 at 04:45:03PM +0100, Lee Jones wrote:
> > > > > > +static void st_dwc3_init(struct st_dwc3 *dwc3_data)
> > > > > > +{
> > > > > > + u32 reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL);
> > > > > > +
> > > > > > + reg |= aux_clk_en(1) | ext_cfg_reset_n(1) | xhci_revision(1);
> > > > > > + reg &= ~sw_pipew_reset_n(1);
> > > > >
> > > > > 1? Better to add defines for these magic numbers. What is 1 anyway?
> > > >
> > > > They are just bit setting macros, I've converted them over to use BIT macro now,
> > > > so it no longer takes a parameter.
> > >
> > > the macros are better, but make them upper case as everybody else.
> >
> > When you say that the macros are better, what do you mean?
> >
> > Defines do the job in a manner which is a great deal cleaner:
> >
> > #define AUX_CLK_EN BIT(0)
> > #define SW_PIPEW_RESET_N BIT(4)
> > #define EXT_CFG_RESET_N BIT(8)
> > #define XHCI_REVISION BIT(12)
> >
> > reg = AUX_CLK_EN | SW_PIPEW_RESET_N | XHCI_REVISION;
> > reg &= ~SW_PIPEW_RESET_N
>
> this is what I meant ;-) I see what I wrote can be very ambiguous :-p

Okay great, thanks for clarifying. :)

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog