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WIP: e11232: USDHC: uSDHC setting requirement for IPG_CLK and AHB_BUS clocks

Angus Ainslie requested to merge angus.ainslie/linux:mmc-timeout-fix into imx8-current-librem5

Description: uSDHC AHB_BUS and IPG_CLK clocks must be synchronized. Due to current physical design implementation, AHB_BUS and IPG_CLK must come from same clock source to maintain clock sync. Workaround: Set AHB_BUS and IPG_CLK to clock source from PLL1.

Fixes https://source.puri.sm/Librem5/linux-next/-/issues/164 https://source.puri.sm/Librem5/linux-next/-/issues/143 https://source.puri.sm/Librem5/linux-next/-/issues/124

Edited by Angus Ainslie

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