linux-kernel - Re: [PATCH v3 1/3] clk: analogbits: add Wide-Range PLL library

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Message-ID: <alpine.DEB.2.21.9999.1904301142521.7063@viisi.sifive.com>
Date:   Tue, 30 Apr 2019 11:43:03 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Stephen Boyd <sboyd@...nel.org>
cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul@...an.com>,
        Wesley Terpstra <wesley@...ive.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Michael Turquette <mturquette@...libre.com>,
        Megan Wachs <megan@...ive.com>
Subject: Re: [PATCH v3 1/3] clk: analogbits: add Wide-Range PLL library

On Tue, 30 Apr 2019, Stephen Boyd wrote:

> Quoting Paul Walmsley (2019-04-29 22:57:15)
> > On Mon, 29 Apr 2019, Stephen Boyd wrote:
> > 
> > > Quoting Paul Walmsley (2019-04-29 12:42:07)
> > > > On Fri, 26 Apr 2019, Paul Walmsley wrote:
> > > > > On Fri, 26 Apr 2019, Stephen Boyd wrote:
> > > > > 
> > > > > > Quoting Paul Walmsley (2019-04-11 01:27:32)
> > > > > > > Add common library code for the Analog Bits Wide-Range PLL (WRPLL) IP
> > > > > > > block, as implemented in TSMC CLN28HPC.
> > > > > > 
> > > > > > I haven't deeply reviewed at all, but I already get two problems when
> > > > > > compile testing these patches. I can fix them up if nothing else needs
> > > > > > fixing.
> > > > > > 
> > > > > > drivers/clk/analogbits/wrpll-cln28hpc.c:165 __wrpll_calc_divq() warn: should 'target_rate << divq' be a 64 bit type?
> > > > > > drivers/clk/sifive/fu540-prci.c:214:16: error: return expression in void function
> > > > > 
> > > > > Hmm, that's odd.  I will definitely take a look and repost.
> > > > 
> > > > I'm not able to reproduce these problems.  The configs tried here were:
> > > > 
> > > > - 64-bit RISC-V defconfig w/ PRCI driver enabled (gcc 8.2.0 built with 
> > > >   crosstool-NG 1.24.0)
> > > > 
> > > > - 32-bit ARM defconfig w/ PRCI driver enabled (gcc 8.3.0 built with 
> > > >   crosstool-NG 1.24.0)
> > > > 
> > > > - 32-bit i386 defconfig w/ PRCI driver enabled (gcc 
> > > >   5.4.0-6ubuntu1~16.04.11)
> > > > 
> > > > Could you post the toolchain and kernel config you're using?
> > > > 
> > > 
> > > I'm running sparse and smatch too.
> > 
> > OK.  I was able to reproduce the __wrpll_calc_divq() warning.  It's been 
> > resolved in the upcoming revision.  
> > 
> > But I don't see the second error with either sparse or smatch.  (This is 
> > with sparse at commit 2b96cd804dc7 and smatch at commit f0092daff69d.)
> > 
> 
> Weird! The return in void function is pretty obvious though so please
> fix it regardless.

Done.

- Paul