[PATCH] arm: imx: imx8mq: add support to get values for more clocks

[Peng Fan (OSS)]

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 at 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.de%2Fpipermail%2Fu-boot%2F2021-September%2F460176.html&data=04%7C01%7Cpeng.fan%40nxp.com%7C3fd04432d40141466d4208d97391b927%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637667891977601595%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=%2BYXFWRvw3LG%2FhqKU0uxxrvCXiqfKD3qL80DISvG6PQA%3D&reserved=0
> 
> 
>   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_ESDHC_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);
>   	}
> 

Reviewed-by: Peng Fan <peng.fan at nxp.com>