linux-kernel - Re: [PATCH v4] clk: axs10x: introduce AXS10X pll driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20170712230536.GE22780@codeaurora.org>
Date:   Wed, 12 Jul 2017 16:05:36 -0700
From:   "sboyd@...eaurora.org" <sboyd@...eaurora.org>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v4] clk: axs10x: introduce AXS10X pll driver

On 07/12, Eugeniy Paltsev wrote:
> On Tue, 2017-07-11 at 22:25 -0700, Stephen Boyd wrote:
> > On 06/21, Eugeniy Paltsev wrote:
> > > AXS10X boards manages it's clocks using various PLLs. These PLL has
> > > same
> > > dividers and corresponding control registers mapped to different
> > > addresses.
> > > So we add one common driver for such PLLs.
> > > 
> > > Each PLL on AXS10X board consist of three dividers: IDIV, FBDIV and
> > > ODIV. Output clock value is managed using these dividers.
> > > 
> > > We add pre-defined tables with supported rate values and
> > > appropriate
> > > configurations of IDIV, FBDIV and ODIV for each value.
> > > 
> > > As of today we add support for PLLs that generate clock for the
> > > following devices:
> > >  * ARC core on AXC CPU tiles.
> > >  * ARC PGU on ARC SDP Mainboard.
> > > and more to come later.
> > > 
> > > By this patch we add support for two plls (arc core pll and pgu
> > > pll),
> > > so we had to use two different init types: CLK_OF_DECLARE for arc
> > > core pll and
> > > regular probing for pgu pll.
> > > 
> > > Acked-by: Rob Herring <robh@...nel.org>
> > > Acked-by: Jose Abreu <joabreu@...opsys.com>
> > > 
> > > Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> > > Signed-off-by: Vlad Zakharov <vzakhar@...opsys.com>
> > > Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> > 
> > Sorry this missed the cutoff for new code for v4.13. Should be in
> > clk-next next week though.
> > 
> > > +}
> > > +
> > > +static inline struct axs10x_pll_clk *to_axs10x_pll_clk(struct
> > > clk_hw *hw)
> > > +{
> > > +	return container_of(hw, struct axs10x_pll_clk, hw);
> > > +}
> > > +
> > > +static inline u32 axs10x_div_get_value(u32 reg)
> > > +{
> > > +	if (PLL_REG_GET_BYPASS(reg))
> > > +		return 1;
> > > +
> > > +	return PLL_REG_GET_HIGH(reg) + PLL_REG_GET_LOW(reg);
> > > +}
> > > +
> > > +static inline u32 axs10x_encode_div(unsigned int id, int upd)
> > > +{
> > > +	u32 div = 0;
> > > +
> > > +	PLL_REG_SET_LOW(div, (id % 2 == 0) ? id >> 1 : (id >> 1) +
> > > 1);
> > > +	PLL_REG_SET_HIGH(div, id >> 1);
> > > +	PLL_REG_SET_EDGE(div, id % 2);
> > > +	PLL_REG_SET_BYPASS(div, id == 1 ? 1 : 0);
> > > +	PLL_REG_SET_NOUPD(div, !upd);
> > 
> > So sparse complains here about a "dubious !x & y". Perhaps this
> > can be changed to
> > 
> > 	PLL_REG_SET_NOUPD(div, upd == 0 ? 1 : 0);
> > 
> > That way sparse doesn't complain. I can make the change when
> > applying if you agree.
> 
> Sure, thanks a lot.
> 

Ok. Applied to clk-next.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project