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From: Douglas Anderson <dianders@chromium.org>
To: ulf.hansson@linaro.org, kishon@ti.com,
	Heiko Stuebner <heiko@sntech.de>,
	robh+dt@kernel.org
Cc: shawn.lin@rock-chips.com, xzy.xu@rock-chips.com,
	briannorris@chromium.org, adrian.hunter@intel.com,
	linux-rockchip@lists.infradead.org, linux-mmc@vger.kernel.org,
	devicetree@vger.kernel.org,
	Douglas Anderson <dianders@chromium.org>,
	pawel.moll@arm.com, mark.rutland@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock
Date: Tue,  7 Jun 2016 15:44:39 -0700	[thread overview]
Message-ID: <1465339484-969-7-git-send-email-dianders@chromium.org> (raw)
In-Reply-To: <1465339484-969-1-git-send-email-dianders@chromium.org>

Some SD/eMMC PHYs (like the PHY from Arasan that is designed to work
with arasan,sdhci-5.1) need to know the card clock in order to function
properly.  Let's expose this clock using a standard device tree
mechanism so that the PHY can get access to and query the card clock.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
 Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index b67e623ca1ff..074d03e630ec 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -30,6 +30,12 @@ Optional Properties:
   - arasan,soc-ctl-syscon: A phandle to a syscon device (see ../mfd/syscon.txt)
     used to access core corecfg registers.  Offsets of registers in this
     syscon are determined based on the main compatible string for the device.
+  - clock-output-names: If specified, this will be the name of the card clock
+    which will be exposed by this device.  Required if #clock-cells is
+    specified.
+  - #clock-cells: If specified this should be the value <0>.  With this property
+    in place we will export a clock representing the Card Clock.  This clock
+    is expected to be consumed by our PHY.  You must also specify
 
 Example:
 	sdhci@e0100000 {
@@ -61,7 +67,9 @@ Example:
 		arasan,soc-ctl-syscon = <&grf>;
 		assigned-clocks = <&cru SCLK_EMMC>;
 		assigned-clock-rates = <200000000>;
+		clock-output-names = "emmc_cardclock";
 		phys = <&emmc_phy>;
 		phy-names = "phy_arasan";
+		#clock-cells = <0>;
 		status = "disabled";
 	};
-- 
2.8.0.rc3.226.g39d4020

  parent reply	other threads:[~2016-06-07 22:44 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-07 22:44 [PATCH 0/11] Changes to support 150 MHz eMMC on rk3399 Douglas Anderson
     [not found] ` <1465339484-969-1-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-06-07 22:44   ` [PATCH 01/11] phy: rockchip-emmc: Increase lock time allowance Douglas Anderson
     [not found]     ` <1465339484-969-2-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-06-13  7:58       ` Shawn Lin
     [not found]         ` <3e19ff54-ee4a-c208-e137-1c0f8022f6b3-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-06-13 23:07           ` Doug Anderson
2016-06-07 22:44   ` [PATCH 02/11] mmc: sdhci-of-arasan: Always power the PHY off/on when clock changes Douglas Anderson
     [not found]     ` <1465339484-969-3-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-06-13  8:08       ` Shawn Lin
2016-06-13 23:06         ` Doug Anderson
2016-06-07 22:44   ` [PATCH 03/11] Documentation: mmc: sdhci-of-arasan: Add soc-ctl-syscon for corecfg regs Douglas Anderson
2016-06-08 20:17     ` Rob Herring
2016-06-13  8:18     ` Shawn Lin
     [not found]       ` <45a7e8c7-5bd4-8c40-004a-b8906eff881a-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-06-13  9:32         ` Heiko Stübner
2016-06-13 23:07       ` Doug Anderson
2016-06-07 22:44   ` [PATCH 07/11] mmc: sdhci-of-arasan: Add ability to export card clock Douglas Anderson
2016-06-07 22:44   ` [PATCH 08/11] Documentation: phy: Let the rockchip eMMC PHY get an exported " Douglas Anderson
2016-06-10 13:36     ` Rob Herring
2016-06-13 23:05       ` Doug Anderson
2016-06-07 22:44   ` [PATCH 10/11] phy: rockchip-emmc: Minor code cleanup in rockchip_emmc_phy_power_off() Douglas Anderson
2016-06-13  8:56     ` Shawn Lin
2016-06-13 23:05       ` Doug Anderson
2016-06-07 22:44 ` [PATCH 04/11] mmc: sdhci-of-arasan: Properly set corecfg_baseclkfreq on rk3399 Douglas Anderson
2016-06-13  8:36   ` Shawn Lin
     [not found]     ` <f5dcc018-bd60-87a7-798b-efc261e443dd-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-06-13 23:06       ` Doug Anderson
2016-06-14  0:14         ` Shawn Lin
     [not found]           ` <47a2dcd9-9c3c-8fde-2be0-40e305c25e8d-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-06-14  0:43             ` Doug Anderson
     [not found]               ` <CAD=FV=UL5tU8RWtHF=-pE8SA0jUcBsqQDOU0BrruXOF7yGh5xg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-14  0:59                 ` Shawn Lin
2016-06-14  2:13                   ` Doug Anderson
2016-06-16  1:06                     ` Shawn Lin
2016-06-07 22:44 ` [PATCH 05/11] arm64: dts: rockchip: Add soc-ctl-syscon to sdhci for rk3399 Douglas Anderson
2016-06-07 22:44 ` Douglas Anderson [this message]
2016-06-08 20:19   ` [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock Rob Herring
2016-06-08 20:52     ` Doug Anderson
2016-06-10 13:10       ` Rob Herring
2016-06-13 23:05         ` Doug Anderson
2016-06-07 22:44 ` [PATCH 09/11] phy: rockchip-emmc: Set phyctrl_frqsel based on " Douglas Anderson
     [not found]   ` <1465339484-969-10-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2016-06-13  8:54     ` Shawn Lin
2016-06-13 23:05       ` Doug Anderson
2016-06-14  0:24         ` Shawn Lin
     [not found]           ` <036b0349-8343-f5de-7215-5a0843ebc6a9-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-06-14  0:45             ` Doug Anderson
2016-06-07 22:44 ` [PATCH 11/11] arm64: dts: rockchip: Provide emmcclk to PHY for rk3399 Douglas Anderson

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