linux-kernel - Re: [PATCH v2 6/7] clk: sunxi-ng: Add A23 CCU

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Date:   Thu, 8 Sep 2016 11:20:24 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mylene Josserand <mylene.josserand@...e-electrons.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH v2 6/7] clk: sunxi-ng: Add A23 CCU

On Thu, Sep 08, 2016 at 04:32:25PM +0800, Chen-Yu Tsai wrote:
> On Thu, Sep 8, 2016 at 4:29 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > On Wed, Sep 07, 2016 at 03:24:11PM +0800, Chen-Yu Tsai wrote:
> >> > +               [CLK_BUS_MSGBOX]        = &bus_msgbox_clk.common.hw,
> >>
> >> A23 manual and Allwinner sources say there is a bus gate for SPINLOCK.
> >> Tested it myself, and it indeed exists.
> >
> > Yes, sorry. It was supposed to be spinlock instead of msgbox.
> >
> >> > +       [RST_BUS_SPINLOCK]      =  { 0x2c4, BIT(22) },
> >>
> >> Allwinner sources say there is a reset control for MSGBOX.
> >> Tested it myself, and it indeed exists.
> >
> > However, the msgbox is mentionned nowhere in the datasheet.
> >
> > I'd prefer to be able to test that it actually works before adding it
> > to the clock driver.
> 
> I did in fact test it. With reset asserted, writes get ignored,
> and reads produce all 0s. With the reset deasserted and clock
> enabled, reads give the default value and writes stick. Afterwards
> when I toggle the reset, the values revert to the default.

Ok.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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