korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-23 11:04:44 +08:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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 <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20200622164431.3dbc8c5a@xhacker.debian
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jisheng Zhang 2020-06-22 16:44:31 +08:00 committed by Ulf Hansson
parent b9a349fdc7
commit 72f47aec86
6 changed files with 147 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.txt
View File

@ -1,25 +0,0 @@
* The simple eMMC hardware reset provider
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.
Required properties:
- compatible : contains "mmc-pwrseq-emmc".
- reset-gpios : 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.
Example:
sdhci0_pwrseq {
compatible = "mmc-pwrseq-emmc";
reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
}

46
Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml Normal file
View File

@ -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 <ulf.hansson@linaro.org>
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>;
};
...

16
Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt
View File

@ -1,16 +0,0 @@
* Marvell SD8787 power sequence provider
Required properties:
- compatible: must be "mmc-pwrseq-sd8787".
- powerdown-gpios: contains a power down GPIO specifier with the
default active state
- reset-gpios: contains a reset GPIO specifier with the default
active state
Example:
wifi_pwrseq: wifi_pwrseq {
compatible = "mmc-pwrseq-sd8787";
powerdown-gpios = <&twl_gpio 0 GPIO_ACTIVE_LOW>;
reset-gpios = <&twl_gpio 1 GPIO_ACTIVE_LOW>;
}

39
Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml Normal file
View File

@ -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 <ulf.hansson@linaro.org>
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>;
};
...

31
Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
View File

@ -1,31 +0,0 @@
* The simple MMC power sequence provider
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.
Required properties:
- compatible : contains "mmc-pwrseq-simple".
Optional properties:
- reset-gpios : 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 : Must contain an entry for the entry in clock-names.
See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entry:
"ext_clock" (External clock provided to the card).
- post-power-on-delay-ms : Delay in ms after powering the card and
de-asserting the reset-gpios (if any)
- power-off-delay-us : Delay in us after asserting the reset-gpios (if any)
during power off of the card.
Example:
sdhci0_pwrseq {
compatible = "mmc-pwrseq-simple";
reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
clocks = <&clk_32768_ck>;
clock-names = "ext_clock";
}

62
Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml Normal file
View File

@ -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 <ulf.hansson@linaro.org>
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";
};
...