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Message-ID: <20121110022254.18014.31873@nucleus>
Date: Fri, 09 Nov 2012 18:22:54 -0800
From: Mike Turquette <mturquette@...aro.org>
To: Murali Karicheri <m-karicheri2@...com>,
Sekhar Nori <nsekhar@...com>
Cc: <arnd@...db.de>, <akpm@...ux-foundation.org>,
<shawn.guo@...aro.org>, <rob.herring@...xeda.com>,
<linus.walleij@...aro.org>, <viresh.linux@...il.com>,
<linux-kernel@...r.kernel.org>, <khilman@...com>,
<linux@....linux.org.uk>, <sshtylyov@...sta.com>,
<davinci-linux-open-source@...ux.davincidsp.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-keystone@...t.ti.com>
Subject: Re: [PATCH v3 02/11] clk: davinci - add PSC clock driver
Quoting Murali Karicheri (2012-11-05 07:10:52)
> On 11/03/2012 08:07 AM, Sekhar Nori wrote:
> > On 10/25/2012 9:41 PM, Murali Karicheri wrote:
> >> This is the driver for the Power Sleep Controller (PSC) hardware
> >> found on DM SoCs as well Keystone SoCs (c6x). This driver borrowed
> >> code from arch/arm/mach-davinci/psc.c and implemented the driver
> >> as per common clock provider API. The PSC module is responsible for
> >> enabling/disabling the Power Domain and Clock domain for different IPs
> >> present in the SoC. The driver is configured through the clock data
> >> passed to the driver through struct clk_psc_data.
> >>
> >> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> >> ---
> >> +/**
> >> + * struct clk_psc - DaVinci PSC clock driver data
> >> + *
> >> + * @hw: clk_hw for the psc
> >> + * @psc_data: Driver specific data
> >> + */
> >> +struct clk_psc {
> >> + struct clk_hw hw;
> >> + struct clk_psc_data *psc_data;
> >> + spinlock_t *lock;
> > Unused member? I don't see this being used.
>
> OK. Will remove.
Those locks are only used for the case where a register might contain
bits for several clocks. Thus RMW operations are protected. On OMAP
this isn't necessary due to a very generous register layout (typically
one 32-bit reg per module) controlling clocks. Seems tha tmaybe this is
not needed for PSC module either?
Regards,
Mike
> >
> > Thanks,
> > Sekhar
> >
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