linux-kernel - Re: [PATCH 1/3] usb: orion-echi: Add support for the Armada 3700

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Date:   Wed, 08 Mar 2017 18:21:42 +0100
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org, jinghua <jinghua@...vell.com>
Subject: Re: [PATCH 1/3] usb: orion-echi: Add support for the Armada 3700

Hi Andrew,
 
 On mer., mars 08 2017, Andrew Lunn <andrew@...n.ch> wrote:

> Hi Gregory
[...]

Thanks for your comments I will fix the typos and the wording.



>> +#define USB_SBUSCFG		0x90
>> +#define	    USB_SBUSCFG_BAWR	    0x6
>> +#define	    USB_SBUSCFG_BARD	    0x3
>> +#define	    USB_SBUSCFG_AHBBRST	    0x0
>
> These three are all shifts. So i would suggest adding _SHIFT to the
> end.

Actually I removed it to fit in the 80 character...

>
>> +
>> +/* BAWR = BARD = 3 : Align read/write bursts packets larger than 128 bytes */
>> +#define USB_SBUSCFG_BAWR_ALIGN_128B	0x3
>> +#define USB_SBUSCFG_BARD_ALIGN_128B	0x3
>> +/* AHBBRST = 3	   : Align AHB Burst to INCR16 (64 bytes) */
>> +#define USB_SBUSCFG_AHBBRST_INCR16	0x3
>
> You can then apply the shift here.

... but I didn't think to this trick. 

>
>> +
>> +#define USB_SBUSCFG_DEF_VAL ((USB_SBUSCFG_BAWR_ALIGN_128B << USB_SBUSCFG_BAWR) \
>> +		     | (USB_SBUSCFG_BARD_ALIGN_128B << USB_SBUSCFG_BARD) \
>> +		     | (USB_SBUSCFG_AHBBRST_INCR16 << USB_SBUSCFG_AHBBRST))
>
> and this is then shorted.

So I will do it in the v2.

Thanks

Gregory

>
>     Andrew

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com