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

[Heiko Thiery <heiko.thiery@gmail.com>]

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://lists.denx.de/pipermail/u-boot/2021-September/460176.html


 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);
 	}
-- 
2.30.0