On Wednesday 15 January 2014 21:56:26 zhangfei wrote:
> However, in our board cd =0 when card is deteced while cd=1 when card is
> removed.
> In order to mmc_gpio_get_cd return 1, MMC_CAP2_CD_ACTIVE_HIGH has to be
> set, as well as new property "caps2-mmc-cd-active-low".
>
> --- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
> +++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
> @@ -73,6 +73,8 @@ Optional properties:
> +* caps2-mmc-cd-active-low: cd pin is low when card active
> +
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> + if (of_find_property(np, "caps2-mmc-cd-active-low", NULL))
> + pdata->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
> +
The MMC_CAP2_CD_ACTIVE_HIGH flag should only be required for
legacy platforms. With DT parsing, you can normally specify
the polarity of the GPIO line in the GPIO specifier in DT.
Arnd
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