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Return the root clock values for MXC_CSPI_CLK, MXC_I2C_CLK, MXC_UART_CLK and MXC_QSPI_CLK. At least for the I2C clock the missing support leads to a wrong configured I2C frequency. The expected value is 100kHz but the resulting value is about 1MHz. Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Fabio Estevam <festevam@gmail.com>
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