1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 $id: http://devicetree.org/schemas/mmc/fsl-imx-esdhc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
10 - Shawn Guo <shawnguo@kernel.org>
13 - $ref: "mmc-controller.yaml"
16 The Enhanced Secure Digital Host Controller on Freescale i.MX family
17 provides an interface for MMC, SD, and SDIO types of memory cards.
19 This file documents differences between the core properties described
20 by mmc.txt and the properties used by the sdhci-esdhc-imx driver.
43 - const: fsl,imx7d-usdhc
53 boolean, if present, indicate to use controller internal write protection.
57 $ref: /schemas/types.yaml#/definitions/uint32
59 Specify the number of delay cells for override mode.
60 This is used to set the clock delay for DLL(Delay Line) on override mode
61 to select a proper data sampling window in case the clock quality is not good
62 due to signal path is too long on the board. Please refer to eSDHC/uSDHC
63 chapter, DLL (Delay Line) section in RM for details.
67 $ref: '/schemas/types.yaml#/definitions/uint32-matrix'
69 Specify the voltage range in case there are software transparent level
70 shifters on the outputs of the controller. Two cells are required, first
71 cell specifies minimum slot voltage (mV), second cell specifies maximum
75 - description: value for minimum slot voltage
76 - description: value for maximum slot voltage
80 $ref: /schemas/types.yaml#/definitions/uint32
82 Specify the start delay cell point when send first CMD19 in tuning procedure.
86 $ref: /schemas/types.yaml#/definitions/uint32
88 Specify the increasing delay cell steps in tuning procedure.
89 The uSDHC use one delay cell as default increasing step to do tuning process.
90 This property allows user to change the tuning step to more than one delay
91 cells which is useful for some special boards or cards when the default
92 tuning step can't find the proper delay window within limited tuning retries.
95 fsl,strobe-dll-delay-target:
96 $ref: /schemas/types.yaml#/definitions/uint32
98 Specify the strobe dll control slave delay target.
99 This delay target programming host controller loopback read clock, and this
100 property allows user to change the delay target for the strobe input read clock.
101 If not use this property, driver default set the delay target to value 7.
102 Only eMMC HS400 mode need to take care of this property.
110 unevaluatedProperties: false
115 compatible = "fsl,imx51-esdhc";
116 reg = <0x70004000 0x4000>;
122 compatible = "fsl,imx51-esdhc";
123 reg = <0x70008000 0x4000>;
125 cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */
126 wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */