dt-bindings: mmc: Convert pwrseq to json-schema

Convert the pwrseq binding to DT schema format using json-schema.

At the same time, fix a couple of issues with the examples discovered by
the validation tool -- missing ";"

Signed-off-by: Jisheng Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml

@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-emmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Simple eMMC hardware reset provider binding
+
+maintainers:
+  - Ulf Hansson <[email protected]>
+
+description:
+  The purpose of this driver is to perform standard eMMC hw reset
+  procedure, as described by Jedec 4.4 specification. This procedure is
+  performed just after MMC core enabled power to the given mmc host (to
+  fix possible issues if bootloader has left eMMC card in initialized or
+  unknown state), and before performing complete system reboot (also in
+  case of emergency reboot call). The latter is needed on boards, which
+  doesn't have hardware reset logic connected to emmc card and (limited or
+  broken) ROM bootloaders are unable to read second stage from the emmc
+  card if the card is left in unknown or already initialized state.
+
+properties:
+  compatible:
+    const: mmc-pwrseq-emmc
+
+  reset-gpios:
+    minItems: 1
+    description:
+      contains a GPIO specifier. The reset GPIO is asserted
+      and then deasserted to perform eMMC card reset. To perform
+      reset procedure as described in Jedec 4.4 specification, the
+      gpio line should be defined as GPIO_ACTIVE_LOW.
+
+required:
+  - compatible
+  - reset-gpios
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    sdhci0_pwrseq {
+      compatible = "mmc-pwrseq-emmc";
+      reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+    };
+...

Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml

@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-sd8787.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell SD8787 power sequence provider binding
+
+maintainers:
+  - Ulf Hansson <[email protected]>
+
+properties:
+  compatible:
+    const: mmc-pwrseq-sd8787
+
+  powerdown-gpios:
+    minItems: 1
+    description:
+      contains a power down GPIO specifier with the default active state
+
+  reset-gpios:
+    minItems: 1
+    description:
+      contains a reset GPIO specifier with the default active state
+
+required:
+  - compatible
+  - powerdown-gpios
+  - reset-gpios
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    wifi_pwrseq: wifi_pwrseq {
+      compatible = "mmc-pwrseq-sd8787";
+      powerdown-gpios = <&twl_gpio 0 GPIO_ACTIVE_LOW>;
+      reset-gpios = <&twl_gpio 1 GPIO_ACTIVE_LOW>;
+    };
+...

Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml

@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-simple.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Simple MMC power sequence provider binding
+
+maintainers:
+  - Ulf Hansson <[email protected]>
+
+description:
+  The purpose of the simple MMC power sequence provider is to supports a set
+  of common properties between various SOC designs. It thus enables us to use
+  the same provider for several SOC designs.
+
+properties:
+  compatible:
+    const: mmc-pwrseq-simple
+
+  reset-gpios:
+    minItems: 1
+    description:
+      contains a list of GPIO specifiers. The reset GPIOs are asserted
+      at initialization and prior we start the power up procedure of the card.
+      They will be de-asserted right after the power has been provided to the
+      card.
+
+  clocks:
+    minItems: 1
+    description: Handle for the entry in clock-names.
+
+  clock-names:
+    items:
+      - const: ext_clock
+    description: External clock provided to the card.
+
+  post-power-on-delay-ms:
+    description:
+      Delay in ms after powering the card and de-asserting the
+      reset-gpios (if any).
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  power-off-delay-us:
+    description:
+      Delay in us after asserting the reset-gpios (if any)
+      during power off of the card.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    sdhci0_pwrseq {
+      compatible = "mmc-pwrseq-simple";
+      reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+      clocks = <&clk_32768_ck>;
+      clock-names = "ext_clock";
+    };
+...