linux-kernel - [v4 2/3] dt-bindings: mmc: add description of PHY delays for sdhci-cadence

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Message-ID: <1490008842-26854-1-git-send-email-piotrs@cadence.com>
Date:   Mon, 20 Mar 2017 11:20:42 +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: [v4 2/3] dt-bindings: mmc: add description of PHY delays for sdhci-cadence

DTS properties are used instead of fixed data
because PHY settings can be different for different chips/boards.
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
---
Changes for v3:
- move all delays back to dts because they are also boards dependent
- prefix all of the Cadence-specific properties with cdns prefix
---
Changes for v4:
- change the beginning of the commit subject
---
 .../devicetree/bindings/mmc/sdhci-cadence.txt      | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
index c0f37cb..c341820 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
@@ -19,6 +19,53 @@ if supported.  See mmc.txt for details.
 - mmc-hs400-1_8v
 - mmc-hs400-1_2v
 
+Some PHY delays can be configured by following properties.
+PHY DLL input delays:
+They are used to delay the data valid window, and align the window
+to sampling clock. The delay starts from 5ns (for delay parameter equal to 0)
+and it is increased by 2.5ns in each step.
+- cdns,phy-input-delay-sd-highspeed:
+  Value of the delay in the input path for SD high-speed timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-legacy:
+  Value of the delay in the input path for SD legacy timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-sd-uhs-sdr12:
+  Value of the delay in the input path for SD UHS SDR12 timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-sd-uhs-sdr25:
+  Value of the delay in the input path for SD UHS SDR25 timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-sd-uhs-sdr50:
+  Value of the delay in the input path for SD UHS SDR50 timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-sd-uhs-ddr50:
+  Value of the delay in the input path for SD UHS DDR50 timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-mmc-highspeed:
+  Value of the delay in the input path for MMC high-speed timing
+  Valid range = [0:0x1F].
+- cdns,phy-input-delay-mmc-ddr:
+  Value of the delay in the input path for eMMC high-speed DDR timing
+  Valid range = [0:0x1F].
+
+PHY DLL clock delays:
+Each delay property represents the fraction of the clock period.
+The approximate delay value will be
+(<delay property value>/128)*sdmclk_clock_period.
+- cdns,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].
+- cdns,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].
+- cdns,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 +76,5 @@ Example:
 		mmc-ddr-1_8v;
 		mmc-hs200-1_8v;
 		mmc-hs400-1_8v;
+		cdns,phy-dll-delay-sdclk = <0>;
 	};
-- 
2.2.2