From: Dirk Behme <dirk.behme@de.bosch.com>
To: linux-sh@vger.kernel.org
Subject: Re: [RFC] clk: shmobile: r8a7795: Add SD divider support
Date: Wed, 27 Jan 2016 13:14:01 +0000 [thread overview]
Message-ID: <56A8C299.5060702@de.bosch.com> (raw)
In-Reply-To: <1453465586-12807-1-git-send-email-dirk.behme@de.bosch.com>
On 27.01.2016 08:14, Wolfram Sang wrote:
> On Fri, Jan 22, 2016 at 01:26:26PM +0100, Dirk Behme wrote:
>> From: Takeshi Kihara <takeshi.kihara.df@renesas.com>
>>
>> This patch adds SD[0..3] clock divider support for R-Car Gen3 SoC.
>>
>> Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
>> Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
>
> So, I tested this patch and it basically works. I say basically because
> the SDHI code currently does not change the clock rate, only
> en-/disables it. UHS support will need to change the clock later.
>
> One thing I noticed: SD0-2 are 50MHz like the docs say. SD3 is 200MHz
> and I couldn't find a reason for that when having a glimpse. Dirk, can
> you check?
Having the clock patch applied on top of your renesas/v8-sdhi branch [1]
I get
root@salvator-x:/sys/kernel/debug/clk# cat clk_summary
clock enable_cnt prepare_cnt rate
--------------------------------------------------------
...
.main 1 1 8333333
...
.pll1 1 1 1599999936
.pll1_div2 2 2 799999968
hdmi 0 0 24999999
hdmi0 0 0 24999999
hdmi1 0 0 24999999
cl 0 0 16666666
sd3 0 0 99999996
sdif3 0 0 99999996
sd2 0 0 99999996
sdif2 0 0 99999996
sd1 0 0 49999998
sdif1 0 0 49999998
sd0 0 0 49999998
sdif0 0 0 49999998
Best regards
Dirk
[1]
https://github.com/dirkbehme/linux-renesas-rcar-gen3/commits/wsa-renesas/v8-sdhi
next prev parent reply other threads:[~2016-01-27 13:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-22 12:26 [RFC] clk: shmobile: r8a7795: Add SD divider support Dirk Behme
2016-01-25 8:59 ` Geert Uytterhoeven
2016-01-25 9:11 ` Dirk Behme
2016-01-25 19:23 ` Wolfram Sang
2016-01-27 7:14 ` Wolfram Sang
2016-01-27 8:43 ` Geert Uytterhoeven
2016-01-27 9:01 ` Dirk Behme
2016-01-27 13:14 ` Dirk Behme [this message]
2016-01-29 8:14 ` Wolfram Sang
2016-01-29 8:29 ` Dirk Behme
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