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board/arm: sama7g54-ek: enable sdmcc high speed modes

Browse Source 
For details, see:
 - https://github.com/linux4sam/u-boot-at91/commit/23ac019
 - https://github.com/linux4sam/linux-at91/commit/5b35500

U-Boot patches imported and refreshed in local KernelKi fork of U-Boot,
see https://github.com/kernelkit/u-boot/tree/v2025.01-kkit

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2026-03-20 16:18:00 +01:00
parent 23cbfd6f4e
commit 7050f400d5
1 changed files with 25 additions and 0 deletions
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board/arm/microchip-sama7g54-ek/dts/microchip/at91-sama7g5ek.dts
+25
View File
@@ -16,3 +16,28 @@
&thermal_sensor {
status = "disabled";
};
/*
* Enable SDMMC high speed mode, please note that neither 'mmc-ddr-1_8v'
* or 'mmc-hs200-1_8v' work, even though [1] states they are supported,
* the errata [2] tells a different story: "Using mode SDR104, HS200 or
* HS400 may lead to tuning issues, data read errors or clock switching
* failures." — empirical testing has proved this on a rev 5 board.
*
* [1]: https://github.com/linux4sam/linux-at91/commit/5b35500
* [2]: https://ww1.microchip.com/downloads/en/DeviceDoc/SAMA7G5-Series-Silicon-Errata-and-Data-Sheet-Clarification-DS80001016A.pdf
*/
&sdmmc0 {
/delete-property/ sdhci-caps-mask;
cap-mmc-highspeed;
cap-mmc-hw-reset;
};
&sdmmc1 {
/delete-property/ no-1-8-v;
/delete-property/ sdhci-caps-mask;
};
&sdmmc2 {
/delete-property/ sdhci-caps-mask;
};