On 2021/9/9 20:59, Heiko Thiery wrote:
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
More information and measurements about the wrong configure I2C frequency can be found here: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.denx...
arch/arm/mach-imx/imx8m/clock_imx8mq.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mq.c b/arch/arm/mach-imx/imx8m/clock_imx8mq.c index 60e2218a3c..9db62b944e 100644 --- a/arch/arm/mach-imx/imx8m/clock_imx8mq.c +++ b/arch/arm/mach-imx/imx8m/clock_imx8mq.c @@ -359,10 +359,18 @@ unsigned int mxc_get_clock(enum mxc_clock clk) clock_get_target_val(IPG_CLK_ROOT, &val); val = val & 0x3; return get_root_clk(AHB_CLK_ROOT) / (val + 1);
- case MXC_CSPI_CLK:
return get_root_clk(ECSPI1_CLK_ROOT);- case MXC_I2C_CLK:
return get_root_clk(I2C1_CLK_ROOT);- case MXC_UART_CLK:
return get_root_clk(UART1_CLK_ROOT);- case MXC_QSPI_CLK:
return get_root_clk(QSPI_CLK_ROOT);
Reviewed-by: Peng Fan peng.fan@nxp.com