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clk: sunxi: sun9i-mmc: Implement reset callback for reset controls

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commit 61d2f2a057 upstream.

Our MMC host driver now issues a reset, instead of just deasserting
the reset control, since commit c34eda69ad ("mmc: sunxi: Reset the
device at probe time"). The sun9i-mmc clock driver does not support
this, and will fail, which results in MMC not probing.

This patch implements the reset callback by asserting the reset control,
then deasserting it after a small delay.

Fixes: 7a6fca879f ("clk: sunxi: Add driver for A80 MMC config clocks/resets")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20171218035751.20661-1-wens@csie.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chen-Yu Tsai 2017-12-18 11:57:51 +08:00 committed by Greg Kroah-Hartman
parent 18276e9bcd
commit 2635a64d0e
1 changed files with 12 additions and 0 deletions
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12
drivers/clk/sunxi/clk-sun9i-mmc.c
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@ -16,6 +16,7 @@
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_device.h>
@ -83,9 +84,20 @@ static int sun9i_mmc_reset_deassert(struct reset_controller_dev *rcdev,
return 0;
}
static int sun9i_mmc_reset_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
sun9i_mmc_reset_assert(rcdev, id);
udelay(10);
sun9i_mmc_reset_deassert(rcdev, id);
return 0;
}
static const struct reset_control_ops sun9i_mmc_reset_ops = {
.assert = sun9i_mmc_reset_assert,
.deassert = sun9i_mmc_reset_deassert,
.reset = sun9i_mmc_reset_reset,
};
static int sun9i_a80_mmc_config_clk_probe(struct platform_device *pdev)