From 7bbbfcd4e4956a126b9599bd8aa316cf0c63c8ed Mon Sep 17 00:00:00 2001 From: Jerome Brunet Date: Thu, 23 Jul 2026 11:39:52 +0200 Subject: 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 Signed-off-by: Jerome Brunet Link: https://patch.msgid.link/20260723-a733-rtc-v7-2-8fd68aab94ae@baylibre.com Signed-off-by: Chen-Yu Tsai --- drivers/clk/sunxi-ng/ccu_div.c | 31 +++++++++++++++++++++++++++++-- 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_ */ -- cgit v1.2.3