linux-kernel - Re: [PATCH 3/3] clk: berlin: bg2q: remove non-exist "smemc" gate clock

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Message-ID: <20150113002817.20842.98432@quantum>
Date:	Mon, 12 Jan 2015 16:28:17 -0800
From:	Mike Turquette <mturquette@...aro.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	"Jisheng Zhang" <jszhang@...vell.com>
Cc:	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"antoine.tenart@...e-electrons.com" 
	<antoine.tenart@...e-electrons.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 3/3] clk: berlin: bg2q: remove non-exist "smemc" gate clock

Quoting Sebastian Hesselbarth (2015-01-10 05:08:22)
> On 09.01.2015 13:13, Jisheng Zhang wrote:
> > On Wed, 7 Jan 2015 06:30:55 -0800
> > Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> wrote:
> >> On 07.01.2015 15:22, Jisheng Zhang wrote:
> >>> On Wed, 7 Jan 2015 06:11:58 -0800
> >>> Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> wrote:
> >>>> On 31.12.2014 09:57, Jisheng Zhang wrote:
> >>>>> The "smemc" clock is removed on BG2Q SoCs. In fact, bit19 of clkenable
> >>>>> register is for nfc. Current code use bit19 for non-exist "smemc"
> >>>>> incorrectly, this prevents eMMC from working due to the sdhci's
> >>>>> "core" clk is still gated.
> >>>>>
> >>>>> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> >>>>> Cc: stable@...r.kernel.org # 3.16+
> >>>>> ---
> >>>>>     drivers/clk/berlin/bg2q.c | 1 -
> >>>>>     1 file changed, 1 deletion(-)
> >>>>>
> >>>>> diff --git a/drivers/clk/berlin/bg2q.c b/drivers/clk/berlin/bg2q.c
> >>>>> index 21784e4..440ef81 100644
> >>>>> --- a/drivers/clk/berlin/bg2q.c
> >>>>> +++ b/drivers/clk/berlin/bg2q.c
> >>>>> @@ -285,7 +285,6 @@ static const struct berlin2_gate_data bg2q_gates[]
> >>>>> __initconst = { { "pbridge",      "perif",        15,
> >>>>> CLK_IGNORE_UNUSED }, { "sdio",    "perif",        16,
> >>>>> CLK_IGNORE_UNUSED }, { "nfc",     "perif",        18 },
> >>>
> >>> The nfc here is really confusing, we call it as nfccore internally. Is it
> >>> better to rename it as nfccore?
> >>
> >> I guess it comes from some early Marvell BSP code, if there is no
> >> issues with the name, e.g. something already depends on "nfc", feel
> >> free to rename it to something more meaningful.
> >
> > In BG2, mrvl call the clock as nfccore. The code use "nfc" for it.
> > The situation is similar for usbcore, satacore etc. So keep the name here,
> > what do you think?
> 
> Yes, I am fine with keeping the name as is.
> 
> >>>>> - { "smemc",      "perif",        19 },
> >>>>
> >>>> if bit 19 is for nfc, how does that work out with bit 18 which is
> >>>> still assigned to nfc? Can you re-evaluate clkenable registers for
> >>>
> >>> bit 19 is for nfcEcc, the "io" clock; bit 18 is for nfcCore, the "core"
> >>> clock.
> >>
> >> Ok, then both bits should be dealt with accordingly, i.e. rename
> >> "smemc" to "nfcecc" and use it in the corresponding dts node.
> >>
> >> If this clk_gate just disables a clock that is fed into another
> >> gateable clock module, I can live with removing it - although I
> >> still think it is best to leave the clk_gate in place and pick
> >> another name that does not collide with any other clock name.
> >
> > The nfcecc is already defined in the bg2q_divs, the gate bit is correct there.
> 
> Ok, I had a look in the actual code and agree that the same bit 19
> is used twice. The patch is fine and we can take it as is.
> 
> This is clk subsystem, so either Mike takes it through his fixes branch
> including my
> 
> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> 
> or decides to agree that I take it instead with his Ack. I am fine
> with both.

Acked-by: Michael Turquette <mturquette@...aro.org>

Now the three fixes can stay together and live happily ever after.

Regards,
Mike

> 
> Sebastian
> 
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