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dt-bindings: mmc: sdhci-am654: Document bindings for the host controllers on TI's J721E devices.

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Add binding documentation for mmc host controllers present on TI's J721E
SOC. The 4 bit IP on J721E doesn't have a phy DLL so make DLL related
properties as optional for that compatible. Also add an optional
strobe-sel property used for HS400 speed mode.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Faiz Abbas 2019-06-04 11:39:11 +05:30 committed by Ulf Hansson
parent ef4a8d90b7
commit a457b70904
1 changed files with 8 additions and 1 deletions
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9
Documentation/devicetree/bindings/mmc/sdhci-am654.txt
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@ -8,7 +8,10 @@ Only deviations are documented here.
[3] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
Required Properties:
- compatible: should be "ti,am654-sdhci-5.1"
- compatible: should be one of:
"ti,am654-sdhci-5.1": SDHCI on AM654 device.
"ti,j721e-sdhci-8bit": 8 bit SDHCI on J721E device.
"ti,j721e-sdhci-4bit": 4 bit SDHCI on J721E device.
- reg: Must be two entries.
- The first should be the sdhci register space
- The second should the subsystem/phy register space
@ -16,9 +19,13 @@ Required Properties:
- clock-names: Tuple including "clk_xin" and "clk_ahb"
- interrupts: Interrupt specifiers
- ti,otap-del-sel: Output Tap Delay select
Optional Properties (Required for ti,am654-sdhci-5.1 and ti,j721e-sdhci-8bit):
- ti,trm-icp: DLL trim select
- ti,driver-strength-ohm: driver strength in ohms.
Valid values are 33, 40, 50, 66 and 100 ohms.
Optional Properties:
- ti,strobe-sel: strobe select delay for HS400 speed mode. Default value: 0x0.
Example: