linux-kernel - [v2 PATCH 2/3] Documentation: bindings: add description of PHY delays for sdhci-cadence

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Message-ID: <1488807576-4571-1-git-send-email-piotrs@cadence.com>
Date:   Mon, 6 Mar 2017 13:39:36 +0000
From:   Piotr Sroka <piotrs@...ence.com>
To:     <linux-mmc@...r.kernel.org>
CC:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, Piotr Sroka <piotrs@...ence.com>
Subject: [v2 PATCH 2/3] Documentation: bindings: add description of PHY delays for sdhci-cadence

Add description of new DLL PHY delays.

Signed-off-by: Piotr Sroka <piotrs@...ence.com>
---
Changes for v2:
- file was created in v2. It was a part of driver source file patch.
- most delays were moved from dts file 
  to data associated with an SoC specific compatible
- description of delays was updated to be more clearly
---
 .../devicetree/bindings/mmc/sdhci-cadence.txt          | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
index c0f37cb..77c4b99 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
@@ -19,6 +19,23 @@ if supported.  See mmc.txt for details.
 - mmc-hs400-1_8v
 - mmc-hs400-1_2v
 
+Some PHY delays can be configured by following properties.
+Each delay property represents the fraction of the clock period.
+The approximate delay value will be
+(<delay property value>/128)*sdmclk_clock_period.
+- phy-dll-delay-sdclk:
+  Value of the delay introduced on the sdclk output
+  for all modes except HS200, HS400 and HS400_ES.
+  Valid range = [0:0x7F].
+- phy-dll-delay-sdclk-hsmmc:
+  Value of the delay introduced on the sdclk output
+  for HS200, HS400 and HS400_ES speed modes.
+  Valid range = [0:0x7F].
+- phy-dll-delay-strobe:
+  Value of the delay introduced on the dat_strobe input
+  used in HS400 / HS400_ES speed modes.
+  Valid range = [0:0x7F].
+
 Example:
 	emmc: sdhci@...00000 {
 		compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc";
@@ -29,4 +46,5 @@ Example:
 		mmc-ddr-1_8v;
 		mmc-hs200-1_8v;
 		mmc-hs400-1_8v;
+		phy-dll-delay-sdclk = <0>;
 	};
-- 
2.2.2