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From: mturquette@linaro.org (Mike Turquette)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] clk: rockchip: add bindings for the mmc clock phases
Date: Mon, 17 Nov 2014 13:16:06 -0800	[thread overview]
Message-ID: <20141117211606.25314.43161@quantum> (raw)
In-Reply-To: <CAHNYxRwGWqbznVybmE+tpyghEoQwVFK_V2ubFRKXasvsPS+R7Q@mail.gmail.com>

Quoting Alexandru Stan (2014-11-17 11:50:51)
> Sorry for my previous mail, I sent it as HTML and also top posted.
> Here it goes again:
> 
> On Mon, Nov 17, 2014 at 11:39 AM, Mike Turquette <mturquette@linaro.org> wrote:
> > It looks like you are adding new clocks to handle the phase requirement.
> > Is that the right thing to do? Don't these clks already exist (e.g.
> > SCLK_SDMMC)?
> I actually need to control 2 phases, one of them is used when
> outputting data, the other when sampling. Sunxi does something
> similar: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/273273.html
> 
> Another reason it wouldn't work is because the upstream clock(eg
> SCLK_SDMMC) is twice as fast as the real clock(see RK3288_CLKGEN_DIV
> in drivers/mmc/host/dw_mmc-rockchip.c), since that clock goes to a /2
> divider to be able to do the 90 degree clock phases.

Thanks for the explanation.

Regards,
Mike

> 
> Alexandru Stan

WARNING: multiple messages have this Message-ID (diff)
From: Mike Turquette <mturquette@linaro.org>
To: Alexandru Stan <amstan@chromium.org>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
	addy ke <addy.ke@rock-chips.com>,
	Heiko Stuebner <heiko@sntech.de>,
	pawel.moll@arm.com, ijc+devicetree@hellion.org.uk,
	linux-kernel@vger.kernel.org,
	Kever Yang <kever.yang@rock-chips.com>,
	Doug Anderson <dianders@chromium.org>,
	linux-rockchip@lists.infradead.org, robh+dt@kernel.org,
	galak@codeaurora.org, Sonny Rao <sonnyrao@chromium.org>,
	linux-arm-kernel@lists.infradead.org, mark.yao@rock-chips.com
Subject: Re: [PATCH v2 1/2] clk: rockchip: add bindings for the mmc clock phases
Date: Mon, 17 Nov 2014 13:16:06 -0800	[thread overview]
Message-ID: <20141117211606.25314.43161@quantum> (raw)
In-Reply-To: <CAHNYxRwGWqbznVybmE+tpyghEoQwVFK_V2ubFRKXasvsPS+R7Q@mail.gmail.com>

Quoting Alexandru Stan (2014-11-17 11:50:51)
> Sorry for my previous mail, I sent it as HTML and also top posted.
> Here it goes again:
> 
> On Mon, Nov 17, 2014 at 11:39 AM, Mike Turquette <mturquette@linaro.org> wrote:
> > It looks like you are adding new clocks to handle the phase requirement.
> > Is that the right thing to do? Don't these clks already exist (e.g.
> > SCLK_SDMMC)?
> I actually need to control 2 phases, one of them is used when
> outputting data, the other when sampling. Sunxi does something
> similar: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/273273.html
> 
> Another reason it wouldn't work is because the upstream clock(eg
> SCLK_SDMMC) is twice as fast as the real clock(see RK3288_CLKGEN_DIV
> in drivers/mmc/host/dw_mmc-rockchip.c), since that clock goes to a /2
> divider to be able to do the 90 degree clock phases.

Thanks for the explanation.

Regards,
Mike

> 
> Alexandru Stan

  reply	other threads:[~2014-11-17 21:16 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-15  0:00 [PATCH v2 0/2] Add support for the rockchip mmc clock phases using the framework Alexandru M Stan
2014-11-15  0:00 ` Alexandru M Stan
2014-11-15  0:00 ` Alexandru M Stan
2014-11-15  0:00 ` [PATCH v2 1/2] clk: rockchip: add bindings for the mmc clock phases Alexandru M Stan
2014-11-15  0:00   ` Alexandru M Stan
2014-11-17 19:39   ` Mike Turquette
2014-11-17 19:39     ` Mike Turquette
2014-11-17 19:39     ` Mike Turquette
2014-11-17 19:47     ` Alexandru Stan
2014-11-17 19:50     ` Alexandru Stan
2014-11-17 19:50       ` Alexandru Stan
2014-11-17 19:50       ` Alexandru Stan
2014-11-17 21:16       ` Mike Turquette [this message]
2014-11-17 21:16         ` Mike Turquette
2014-11-15  0:00 ` [PATCH v2 2/2] clk: rockchip: Add support for the mmc clock phases using the framework Alexandru M Stan
2014-11-15  0:00   ` Alexandru M Stan

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