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H A D | k3-am65-iot2050-common.dtsi | 79b08ae7 Fri May 28 22:37:49 CDT 2021 Aswath Govindraju <a-govindraju@ti.com> arm64: dts: ti: k3-am65: Add support for UHS-I modes in MMCSD1 subsystem
UHS-I speed modes are supported in AM65 S.R. 2.0 SoC[1].
Add support by removing the no-1-8-v tag and including the voltage regulator device tree nodes for power cycling.
However, the 4 bit interface of AM65 SR 1.0 cannot be supported at 3.3 V or 1.8 V because of erratas i2025 and i2026 [2]. As the SD card is the primary boot mode for development usecases, continue to enable SD card and disable UHS-I modes in it to minimize any ageing issues happening because of erratas.
k3-am6528-iot2050-basic and k3-am6548-iot2050-advanced boards use S.R. 1.0 version of AM65 SoC. Therefore, add no-1-8-v in sdhci1 device tree node of the common iot2050 device tree file.
[1] - https://www.ti.com/lit/ug/spruid7e/spruid7e.pdf, section 12.3.6.1.1 [2] - https://www.ti.com/lit/er/sprz452e/sprz452e.pdf
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> Acked-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Nishanth Menon <nm@ti.com> Link: https://lore.kernel.org/r/20210529033749.6250-1-a-govindraju@ti.com
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H A D | k3-am654-base-board.dts | 79b08ae7 Fri May 28 22:37:49 CDT 2021 Aswath Govindraju <a-govindraju@ti.com> arm64: dts: ti: k3-am65: Add support for UHS-I modes in MMCSD1 subsystem
UHS-I speed modes are supported in AM65 S.R. 2.0 SoC[1].
Add support by removing the no-1-8-v tag and including the voltage regulator device tree nodes for power cycling.
However, the 4 bit interface of AM65 SR 1.0 cannot be supported at 3.3 V or 1.8 V because of erratas i2025 and i2026 [2]. As the SD card is the primary boot mode for development usecases, continue to enable SD card and disable UHS-I modes in it to minimize any ageing issues happening because of erratas.
k3-am6528-iot2050-basic and k3-am6548-iot2050-advanced boards use S.R. 1.0 version of AM65 SoC. Therefore, add no-1-8-v in sdhci1 device tree node of the common iot2050 device tree file.
[1] - https://www.ti.com/lit/ug/spruid7e/spruid7e.pdf, section 12.3.6.1.1 [2] - https://www.ti.com/lit/er/sprz452e/sprz452e.pdf
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> Acked-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Nishanth Menon <nm@ti.com> Link: https://lore.kernel.org/r/20210529033749.6250-1-a-govindraju@ti.com
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H A D | k3-am65-main.dtsi | 79b08ae7 Fri May 28 22:37:49 CDT 2021 Aswath Govindraju <a-govindraju@ti.com> arm64: dts: ti: k3-am65: Add support for UHS-I modes in MMCSD1 subsystem
UHS-I speed modes are supported in AM65 S.R. 2.0 SoC[1].
Add support by removing the no-1-8-v tag and including the voltage regulator device tree nodes for power cycling.
However, the 4 bit interface of AM65 SR 1.0 cannot be supported at 3.3 V or 1.8 V because of erratas i2025 and i2026 [2]. As the SD card is the primary boot mode for development usecases, continue to enable SD card and disable UHS-I modes in it to minimize any ageing issues happening because of erratas.
k3-am6528-iot2050-basic and k3-am6548-iot2050-advanced boards use S.R. 1.0 version of AM65 SoC. Therefore, add no-1-8-v in sdhci1 device tree node of the common iot2050 device tree file.
[1] - https://www.ti.com/lit/ug/spruid7e/spruid7e.pdf, section 12.3.6.1.1 [2] - https://www.ti.com/lit/er/sprz452e/sprz452e.pdf
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> Acked-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Nishanth Menon <nm@ti.com> Link: https://lore.kernel.org/r/20210529033749.6250-1-a-govindraju@ti.com
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