On 9 May 2014 17:37, Balaji T K <balajitk@xxxxxx> wrote:
> Provide an option to get CD debounce time from DT
>
> Signed-off-by: Balaji T K <balajitk@xxxxxx>
> ---
> Documentation/devicetree/bindings/mmc/mmc.txt | 1 +
> drivers/mmc/core/host.c | 6 +++++-
> 2 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
> index 9dce540..fae590b 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/mmc.txt
> @@ -17,6 +17,7 @@ Optional properties:
> - bus-width: Number of data lines, can be <1>, <4>, or <8>. The default
> will be <1> if the property is absent.
> - wp-gpios: Specify GPIOs for write protection, see gpio binding
> +- cd-debounce-us: debounce time in microseconds for card detect gpio.
> - cd-inverted: when present, polarity on the CD line is inverted. See the note
> below for the case, when a GPIO is used for the CD line
> - wp-inverted: when present, polarity on the WP line is inverted. See the note
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index fdea825..59cd3a0 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -313,6 +313,7 @@ int mmc_of_parse(struct mmc_host *host)
> bool explicit_inv_wp, gpio_inv_wp = false;
> enum of_gpio_flags flags;
> int len, ret, gpio;
> + unsigned int debounce;
>
> if (!host->parent || !host->parent->of_node)
> return 0;
> @@ -367,6 +368,9 @@ int mmc_of_parse(struct mmc_host *host)
> if (of_find_property(np, "broken-cd", &len))
> host->caps |= MMC_CAP_NEEDS_POLL;
>
> + if (of_property_read_u32(np, "cd-debounce-us", &debounce) < 0)
> + debounce = 0;
> +
Hi Balaji,
Sorry for a late reply.
I am wondering whether this should be a generic gpio of property,
instead of a mmc specific thing.
I have added Linus Walleij and Alexandre Courbot, the maintainers of
gpio. Let's see if they can point us in a direction.
> gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags);
> if (gpio == -EPROBE_DEFER)
> return gpio;
> @@ -374,7 +378,7 @@ int mmc_of_parse(struct mmc_host *host)
> if (!(flags & OF_GPIO_ACTIVE_LOW))
> gpio_inv_cd = true;
>
> - ret = mmc_gpio_request_cd(host, gpio, 0);
> + ret = mmc_gpio_request_cd(host, gpio, debounce);
> if (ret < 0) {
> dev_err(host->parent,
> "Failed to request CD GPIO #%d: %d!\n",
> --
> 1.7.5.4
>
Kind regards
Uffe
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