On 3/22/21 8:04 AM, Fabio Estevam wrote:
Hi Haibo,
On Mon, Mar 22, 2021 at 8:09 AM <haibo.c...@nxp.com> wrote:
--- a/arch/arm/dts/imx8mm-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-evk-u-boot.dtsi
@@ -102,6 +102,7 @@
u-boot,dm-spl;
sd-uhs-sdr104;
sd-uhs-ddr50;
+ fsl,signal-voltage-switch-extra-delay-ms = <8>;
How does the Linux kernel deal with that?
I don't see such property in the mainline kernel or in the NXP tree.
I am concerned that we add a U-Boot specific here. Also, the fact that
common code waits 10ms is a driver implementation detail, so not happy
that such information needs to be passed in the U-Boot dts.
Typically they wait in the regulator. E.g. regulator-ramp-delay or
regulator-settling-time-us. There should be no need to wait in the MMC
driver.
--Sean