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clk: sunxi-ng: div: add read-only operation support

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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>
This commit is contained in:
Jerome Brunet 2026-07-23 11:39:52 +02:00 committed by Chen-Yu Tsai
parent 4bcba49984
commit 7bbbfcd4e4
2 changed files with 30 additions and 2 deletions
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31
drivers/clk/sunxi-ng/ccu_div.c
View File

@ -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");

1
drivers/clk/sunxi-ng/ccu_div.h
View File

@ -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_ */