From 61d2f2a05765a5f57149efbd93e3e81a83cbc2c1 Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Mon, 18 Dec 2017 11:57:51 +0800 Subject: [PATCH] clk: sunxi: sun9i-mmc: Implement reset callback for reset controls Our MMC host driver now issues a reset, instead of just deasserting the reset control, since commit c34eda69ad4c ("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: 7a6fca879f59 ("clk: sunxi: Add driver for A80 MMC config clocks/resets") Cc: # 4.14.x Signed-off-by: Chen-Yu Tsai Acked-by: Philipp Zabel Acked-by: Maxime Ripard Signed-off-by: Michael Turquette Link: lkml.kernel.org/r/20171218035751.20661-1-wens@csie.org --- drivers/clk/sunxi/clk-sun9i-mmc.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/clk/sunxi/clk-sun9i-mmc.c b/drivers/clk/sunxi/clk-sun9i-mmc.c index a1a634253d6f..f00d8758ba24 100644 --- a/drivers/clk/sunxi/clk-sun9i-mmc.c +++ b/drivers/clk/sunxi/clk-sun9i-mmc.c @@ -16,6 +16,7 @@ #include #include +#include #include #include #include @@ -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) -- 2.30.2