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author | Chen-Yu Tsai <wens@csie.org> | 2017-09-26 10:36:20 +0800 |
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committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-09-26 11:13:03 +0200 |
commit | 5da672cff03d3ffa36476e91943af50e3151db2a (patch) | |
tree | 97f07d2ec7afd42501a98446cba54ff1112ac5b1 /drivers | |
parent | a894990ac994a53bc5a0cc694eb12f3c064c18c5 (diff) | |
download | linux-stable-5da672cff03d3ffa36476e91943af50e3151db2a.tar.gz linux-stable-5da672cff03d3ffa36476e91943af50e3151db2a.tar.bz2 linux-stable-5da672cff03d3ffa36476e91943af50e3151db2a.zip |
clk: sunxi-ng: Implement reset control status readback
Until now we were not providing a way to read back the status of our
reset controls. Consumers had no real way to be certain whether a
peripheral was held in reset or not.
Implement the status callback to complete the API support.
Fixes: 1d80c14248d6 ("clk: sunxi-ng: Add common infrastructure")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/clk/sunxi-ng/ccu_reset.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_reset.c b/drivers/clk/sunxi-ng/ccu_reset.c index 1dc4e98ea802..b67149143554 100644 --- a/drivers/clk/sunxi-ng/ccu_reset.c +++ b/drivers/clk/sunxi-ng/ccu_reset.c @@ -60,8 +60,22 @@ static int ccu_reset_reset(struct reset_controller_dev *rcdev, return 0; } +static int ccu_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev); + const struct ccu_reset_map *map = &ccu->reset_map[id]; + + /* + * The reset control API expects 0 if reset is not asserted, + * which is the opposite of what our hardware uses. + */ + return !(map->bit & readl(ccu->base + map->reg)); +} + const struct reset_control_ops ccu_reset_ops = { .assert = ccu_reset_assert, .deassert = ccu_reset_deassert, .reset = ccu_reset_reset, + .status = ccu_reset_status, }; |