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mmc: sunxi: support cd-inverted

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With CONFIG_DM_MMC the BananaPi does not detect SD cards.

The sunxi device trees use the cd-inverted property to indicate that
the card detect is inverted.

This property is documented in Linux kernel devicetree/bindings/mmc/mmc.txt
The property is not marked as deprecated.

A similar patch was posted by Tuomas but is in status "Changes Requested".
https://patchwork.ozlabs.org/patch/850377/

This patch is a stripped down version of his patch.

Suggested-by: Tuomas Tynkkynen <tuomas@tuxera.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Heinrich Schuchardt 2018-02-01 23:39:19 +01:00 committed by Jagan Teki
parent 1bcfba537e
commit 8be4e61d01
1 changed files with 8 additions and 2 deletions
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10
drivers/mmc/sunxi_mmc.c
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@ -30,6 +30,7 @@ struct sunxi_mmc_priv {
uint32_t *mclkreg;
unsigned fatal_err;
struct gpio_desc cd_gpio; /* Change Detect GPIO */
int cd_inverted; /* Inverted Card Detect */
struct sunxi_mmc *reg;
struct mmc_config cfg;
};
@ -544,9 +545,11 @@ static int sunxi_mmc_getcd(struct udevice *dev)
{
struct sunxi_mmc_priv *priv = dev_get_priv(dev);
if (dm_gpio_is_valid(&priv->cd_gpio))
return dm_gpio_get_value(&priv->cd_gpio);
if (dm_gpio_is_valid(&priv->cd_gpio)) {
int cd_state = dm_gpio_get_value(&priv->cd_gpio);
return cd_state ^ priv->cd_inverted;
}
return 1;
}
@ -610,6 +613,9 @@ static int sunxi_mmc_probe(struct udevice *dev)
sunxi_gpio_set_pull(cd_pin, SUNXI_GPIO_PULL_UP);
}
/* Check if card detect is inverted */
priv->cd_inverted = dev_read_bool(dev, "cd-inverted");
upriv->mmc = &plat->mmc;
/* Reset controller */