netdev - Re: [PATCH net-next v2 2/9] net: ethernet: oa_tc6: implement mac-phy software reset

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Date: Thu, 26 Oct 2023 22:01:28 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Parthiban.Veerasooran@...rochip.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	corbet@....net, Steen.Hegelund@...rochip.com, rdunlap@...radead.org,
	horms@...nel.org, casper.casan@...il.com, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, Horatiu.Vultur@...rochip.com,
	Woojung.Huh@...rochip.com, Nicolas.Ferre@...rochip.com,
	UNGLinuxDriver@...rochip.com, Thorsten.Kummermehr@...rochip.com
Subject: Re: [PATCH net-next v2 2/9] net: ethernet: oa_tc6: implement mac-phy
 software reset

> >> +     ret = oa_tc6_perform_ctrl(tc6, STATUS0, &regval, 1, false, false);
> >> +     if (ret)
> >> +             return ret;
> >> +
> >> +     /* Check for reset complete interrupt status */
> >> +     if (regval & RESETC) {
> >> +             regval = RESETC;
> > 
> > People don't always agree, but i found STATUS0_RESETC easier to see
> > you have the correct bit for the register you just read.
> Do you want me to define STATUS0_RESETC instead of RESETC or is my 
> understanding wrong?

Correct, STATUS0_RESETC. It avoids silly typos like:

     ret = oa_tc6_perform_ctrl(tc6, STATUS0, &regval, 1, false, false);
     if (ret)
             return ret;

     /* Check for reset complete interrupt status */
     if (regval & RESET) {
             regval = RESETC;

where RESET is a valid register name, but not a bit. Or say:

     ret = oa_tc6_perform_ctrl(tc6, STATUS0, &regval, 1, false, false);
     if (ret)
             return ret;

     /* Check for reset complete interrupt status */
     if (regval & SWRESET) {
             regval = STATUS0_;

where SWRESET is a valid bit, but not for STATUS0.

I've made silly mistakes like this, and learnt that good naming helps
to avoid it.

     Andrew