diff options
| author | Jerome Brunet <jbrunet@baylibre.com> | 2026-07-23 11:39:52 +0200 |
|---|---|---|
| committer | Chen-Yu Tsai <wens@kernel.org> | 2026-07-24 00:02:02 +0800 |
| commit | 7bbbfcd4e4956a126b9599bd8aa316cf0c63c8ed (patch) | |
| tree | 54eeec97e83b31d9fdcb1223a8c123a821d53971 | |
| parent | 4bcba49984ff8c77729f003dd32082b10c02c23b (diff) | |
| download | linux-next-7bbbfcd4e4956a126b9599bd8aa316cf0c63c8ed.tar.gz linux-next-7bbbfcd4e4956a126b9599bd8aa316cf0c63c8ed.zip | |
clk: sunxi-ng: div: add read-only operation support
Add support for sunxi-ng read-only dividers. This will be
useful to the a733 oscillator detection logic.
Reviewed-by: Chen-Yu Tsai <wens@kernel.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patch.msgid.link/20260723-a733-rtc-v7-2-8fd68aab94ae@baylibre.com
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_div.c | 31 | ||||
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_div.h | 1 |
2 files changed, 30 insertions, 2 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_div.c b/drivers/clk/sunxi-ng/ccu_div.c index 62d680ccb524..c385e0160f13 100644 --- a/drivers/clk/sunxi-ng/ccu_div.c +++ b/drivers/clk/sunxi-ng/ccu_div.c @@ -20,8 +20,22 @@ static int ccu_div_determine_rate_helper(struct ccu_mux_internal *mux, if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV) req->rate *= cd->fixed_post_div; - ret = divider_determine_rate(&cd->common.hw, req, cd->div.table, - cd->div.width, cd->div.flags); + if (cd->div.flags & CLK_DIVIDER_READ_ONLY) { + unsigned long val; + u32 reg; + + reg = readl(cd->common.base + cd->common.reg); + val = reg >> cd->div.shift; + val &= (1 << cd->div.width) - 1; + + ret = divider_ro_determine_rate(&cd->common.hw, req, cd->div.table, + cd->div.width, cd->div.flags, val); + + } else { + ret = divider_determine_rate(&cd->common.hw, req, cd->div.table, + cd->div.width, cd->div.flags); + } + if (ret) return ret; @@ -143,3 +157,16 @@ const struct clk_ops ccu_div_ops = { .set_rate = ccu_div_set_rate, }; EXPORT_SYMBOL_NS_GPL(ccu_div_ops, "SUNXI_CCU"); + +const struct clk_ops ccu_rodiv_ops = { + .disable = ccu_div_disable, + .enable = ccu_div_enable, + .is_enabled = ccu_div_is_enabled, + + .get_parent = ccu_div_get_parent, + .set_parent = ccu_div_set_parent, + + .determine_rate = ccu_div_determine_rate, + .recalc_rate = ccu_div_recalc_rate, +}; +EXPORT_SYMBOL_NS_GPL(ccu_rodiv_ops, "SUNXI_CCU"); diff --git a/drivers/clk/sunxi-ng/ccu_div.h b/drivers/clk/sunxi-ng/ccu_div.h index be00b3277e97..a30a92780a05 100644 --- a/drivers/clk/sunxi-ng/ccu_div.h +++ b/drivers/clk/sunxi-ng/ccu_div.h @@ -300,5 +300,6 @@ static inline struct ccu_div *hw_to_ccu_div(struct clk_hw *hw) } extern const struct clk_ops ccu_div_ops; +extern const struct clk_ops ccu_rodiv_ops; #endif /* _CCU_DIV_H_ */ |