From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- .../devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml | 48 ++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml (limited to 'Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml') diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml new file mode 100644 index 000000000..1fc7e620f --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml @@ -0,0 +1,48 @@ +# 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 + +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 + +additionalProperties: false + +examples: + - | + #include + sdhci0_pwrseq { + compatible = "mmc-pwrseq-emmc"; + reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>; + }; +... -- cgit v1.2.3