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drivers: sdhc: add support for using CPOL/CPHA SPI clock modes

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Make it possible to use CPOL/CPHA SPI clock modes with the SDHC driver.
Some cards require the clock to switch to low when not active.

Signed-off-by: Łukasz Hejnak (LeHack) <lehack-ghub@lehack.pl>
This commit is contained in:
Łukasz Hejnak (LeHack) 2023-04-06 22:03:41 +02:00 committed by Carles Cufí
parent 79510788b4
commit 1929eb3af7
4 changed files with 40 additions and 1 deletions
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5
drivers/sdhc/sdhc_spi.c
View file

@ -768,7 +768,10 @@ static struct sdhc_driver_api sdhc_spi_api = {
\
struct sdhc_spi_data sdhc_spi_data_##n = { \
.cfg_a = SPI_CONFIG_DT_INST(n, \
(SPI_LOCK_ON | SPI_HOLD_ON_CS | SPI_WORD_SET(8)),\
(SPI_LOCK_ON | SPI_HOLD_ON_CS | SPI_WORD_SET(8) \
| (DT_INST_PROP(n, spi_clock_mode_cpol) ? SPI_MODE_CPOL : 0) \
| (DT_INST_PROP(n, spi_clock_mode_cpha) ? SPI_MODE_CPHA : 0) \
),\
0), \
}; \
\

14
dts/bindings/sdhc/zephyr,sdhc-spi-slot.yaml
View file

@ -13,4 +13,18 @@ properties:
delay gives the card time to power up or down fully. It can be increased
if you observe issues initializing your card.
spi-clock-mode-cpol:
type: boolean
description: |
Clock polarity to use for SPI SDHC. Some cards respond properly
only when the clock goes low when not active.
spi-clock-mode-cpha:
type: boolean
description: |
Clock phase: this dictates when is the data captured, and depends
on the clock's polarity. When mode-cpol is set and this option as well,
capture will occur on low to high transition and high to low if
this option is not set (default).
bus: sd

2
samples/subsys/fs/fat_fs/boards/nucleo_f429zi.conf Normal file
View file

@ -0,0 +1,2 @@
CONFIG_SPI=y
CONFIG_DISK_DRIVER_SDMMC=y

20
samples/subsys/fs/fat_fs/boards/nucleo_f429zi.overlay Normal file
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@ -0,0 +1,20 @@
/*
* Copyright (c) 2023 Łukasz Hejnak (LeHack) <lehack-ghub@lehack.pl>
*
* SPDX-License-Identifier: Apache-2.0
*/
&spi1 {
sdhc0: sdhc@0 {
compatible = "zephyr,sdhc-spi-slot";
reg = <0>;
status = "okay";
mmc {
compatible = "zephyr,sdmmc-disk";
status = "okay";
};
spi-max-frequency = <25000000>;
spi-clock-mode-cpol;
spi-clock-mode-cpha;
};
};