Re: imx: imx8mq: mxc_get_clock for MXC_I2C_CLK is missing

Hi,

Am Mi., 8. Sept. 2021 um 15:08 Uhr schrieb Heiko Thiery heiko.thiery@gmail.com:

Hi Peng,

I faced an issue with the I2C bus speed in SPL for the imx8mq. I figured out that the bus frequency is set to about 1MHz. While digging into that I found that the clk ID for the I2C is not returned for the imx8mq correctly.

Can you confirm that this is missing here.

This is what I added and now it looks better.

Just measured the frequency and it is still not ok. It changed from 1MHz to 400kHZ. But expected is 100KHz.

diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mq.c b/arch/arm/mach-imx/imx8m/clock_imx8mq.c index 60e2218a3c..9e45ffd66b 100644 --- a/arch/arm/mach-imx/imx8m/clock_imx8mq.c +++ b/arch/arm/mach-imx/imx8m/clock_imx8mq.c @@ -363,6 +363,12 @@ unsigned int mxc_get_clock(enum mxc_clock clk) return get_root_clk(USDHC1_CLK_ROOT); case MXC_ESDHC2_CLK: return get_root_clk(USDHC2_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);
    default:
            return get_root_clk(clk);
    }
  
  
  

-- Heiko