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mmc: dwmmc: Change designware MMC 'clksel' callback function to return status

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Change 'clksel' callback function to allow the code to return a
status.

This patch is a preparation for enabling Arm-Trusted-Firmware (ATF)
in Intel SoC FPGA. This patch does not change functionality.

When using Arm-Trusted-Firmware (ATF) in Intel SoC FPGA, the MMC clock
related register is secure register which is required to be written
via SMC/PCSI call. It is possible that U-Boot fail to write the
register if there is unexpected error between U-Boot and ATF.
As a result, there maybe signal integrity on MMC connection due to
clock. So, the code should reports error to user when 'clksel' fail.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
This commit is contained in:
Siew Chin Lim
2020-12-24 18:21:03 +08:00
committed by Ley Foon Tan
parent 2e54a1d46c
commit d456dfbaa0
6 changed files with 20 additions and 7 deletions
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2
include/dwmmc.h
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@@ -174,7 +174,7 @@ struct dwmci_host {
struct mmc *mmc;
void *priv;
void (*clksel)(struct dwmci_host *host);
int (*clksel)(struct dwmci_host *host);
void (*board_init)(struct dwmci_host *host);
/**