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From: Heiko Stuebner <heiko@sntech.de>
To: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: myungjoo.ham@samsung.com, kyungmin.park@samsung.com,
	robh+dt@kernel.org, devicetree@vger.kernel.org,
	linux-pm@vger.kernel.org, dbasehore@chromium.org,
	linux-kernel@vger.kernel.org, dianders@google.com,
	groek@google.com, kernel@collabora.com,
	Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 2/6] dt-bindings: clock: add DDR3 standard speed bins.
Date: Thu, 19 Apr 2018 13:10:35 +0200	[thread overview]
Message-ID: <5662116.zj93FbmDPb@phil> (raw)
In-Reply-To: <20180419104019.24406-3-enric.balletbo@collabora.com>

Hi Enric,

Am Donnerstag, 19. April 2018, 12:40:15 CEST schrieb Enric Balletbo i Serra:
> DDR3 SDRAM Standard (JESD79-3F) defines some standard speed bins for
> DDR3 memories. The devfreq/rk3399_dmc.txt binding refers to this file
> which does not exist, so add a ddr.h file with the standard speed bins
> for DDR3.
> 
> Fixes: c1ceb8f7c167 (Documentation: bindings: add dt documentation for rk3399 dmc)
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
> 
>  include/dt-bindings/clock/ddr.h | 34 +++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 include/dt-bindings/clock/ddr.h
> 
> diff --git a/include/dt-bindings/clock/ddr.h b/include/dt-bindings/clock/ddr.h
> new file mode 100644
> index 000000000000..506aef7e609e
> --- /dev/null
> +++ b/include/dt-bindings/clock/ddr.h
> @@ -0,0 +1,34 @@
> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
> +
> +#ifndef DT_BINDINGS_DDR_H
> +#define DT_BINDINGS_DDR_H
> +
> +/* DDR3-800 Standard Speed Bins */
> +#define DDR3_800D	15
> +#define DDR3_800E		18
> +/* DDR3-1066 Standard Speed Bins */
> +#define DDR3_1066E	18
> +#define DDR3_1066F	21
> +#define DDR3_1066G	24

looking at the mentioned jedec standard, I don't see where these numerical
values are defined in the standard itself. [I may be blind though]

Could you explain a bit more where these numerical values are coming from?


Thanks
Heiko

  reply	other threads:[~2018-04-19 11:10 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19 10:40 [PATCH 0/6] devfreq: rk3399_dmc: improve rk3399_dmc driver and it's documentation Enric Balletbo i Serra
2018-04-19 10:40 ` [PATCH 1/6] dt-bindings: devfreq: rk3399_dmc: improve binding documentation Enric Balletbo i Serra
2018-04-19 10:40 ` [PATCH 2/6] dt-bindings: clock: add DDR3 standard speed bins Enric Balletbo i Serra
2018-04-19 11:10   ` Heiko Stuebner [this message]
2018-04-19 11:30     ` Enric Balletbo i Serra
2018-04-20 10:58       ` Heiko Stuebner
2018-04-19 10:40 ` [PATCH 3/6] devfreq: rk3399_dmc: remove wait for dcf irq event Enric Balletbo i Serra
2018-04-24  3:55   ` Chanwoo Choi
2018-04-19 10:40 ` [PATCH 4/6] dt-bindings: devfreq: rk3399_dmc: remove interrupts as is not required Enric Balletbo i Serra
2018-04-24  3:56   ` Chanwoo Choi
2018-04-19 10:40 ` [PATCH 5/6] devfreq: rk3399_dmc: do not print error when get supply and clk defer Enric Balletbo i Serra
2018-04-23 10:44   ` Ulf Hansson
2018-04-23 13:37     ` Ezequiel Garcia
2018-04-24  3:55   ` Chanwoo Choi
2018-04-19 10:40 ` [PATCH 6/6] devfreq: rk3399_dmc: register devfreq notification to dmc driver Enric Balletbo i Serra
2018-04-24  4:08   ` Chanwoo Choi
2018-04-23 10:53 ` [PATCH 0/6] devfreq: rk3399_dmc: improve rk3399_dmc driver and it's documentation Ulf Hansson
     [not found] ` <CGME20180419104054epcas5p49612174afb26493bcd937a0232b9b1df@epcms1p3>
2018-04-24  1:53   ` [PATCH 1/6] dt-bindings: devfreq: rk3399_dmc: improve binding documentation MyungJoo Ham
     [not found] ` <CGME20180419104056epcas2p29c74949b650fea596900e395dec662e8@epcms1p7>
2018-04-24  2:31   ` [PATCH 3/6] devfreq: rk3399_dmc: remove wait for dcf irq event MyungJoo Ham
     [not found] ` <CGME20180419104057epcas5p311ecfdeb6cb535cd7100232d282ac323@epcms1p4>
2018-04-24  2:33   ` [PATCH 5/6] devfreq: rk3399_dmc: do not print error when get supply and clk defer MyungJoo Ham
     [not found] ` <CGME20180419104059epcas2p3fe5aba95859e02307556200a42bc1ac2@epcms1p7>
2018-04-24  4:22   ` [PATCH 6/6] devfreq: rk3399_dmc: register devfreq notification to dmc driver MyungJoo Ham
2018-04-24  8:01     ` Enric Balletbo i Serra

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