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

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Date:	Tue, 22 Jul 2014 16:45:03 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Felipe Balbi <balbi@...com>
Cc:	Peter Griffin <peter.griffin@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	maxime.coquelin@...com, patrice.chotard@...com,
	srinivas.kandagatla@...il.com, devicetree@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	peppe.cavallaro@...com
Subject: Re: [PATCH v2 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3
 HC

> > > > +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

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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