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clk: Add a function to retrieve phase
The current phase API doesn't look into the actual hardware to get the phase value, but will rather get it from a variable only set by the set_phase function. This will cause issue when the client driver will never call the set_phase function, where we can end up having a reported phase that will not match what the hardware has been programmed to by the bootloader or what phase is programmed out of reset. Add a new get_phase function for the drivers to implement so that we can get this value. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Hans de Goede <hdegoede@redhat.com>
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@ -1933,6 +1933,16 @@ int __clk_init(struct device *dev, struct clk *clk)
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else
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clk->accuracy = 0;
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/*
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* Set clk's phase.
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* Since a phase is by definition relative to its parent, just
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* query the current clock phase, or just assume it's in phase.
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*/
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if (clk->ops->get_phase)
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clk->phase = clk->ops->get_phase(clk->hw);
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else
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clk->phase = 0;
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/*
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* Set clk's rate. The preferred method is to use .recalc_rate. For
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* simple clocks and lazy developers the default fallback is to use the
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@ -130,6 +130,10 @@ struct dentry;
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* set then clock accuracy will be initialized to parent accuracy
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* or 0 (perfect clock) if clock has no parent.
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*
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* @get_phase: Queries the hardware to get the current phase of a clock.
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* Returned values are 0-359 degrees on success, negative
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* error codes on failure.
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*
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* @set_phase: Shift the phase this clock signal in degrees specified
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* by the second argument. Valid values for degrees are
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* 0-359. Return 0 on success, otherwise -EERROR.
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@ -182,6 +186,7 @@ struct clk_ops {
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unsigned long parent_rate, u8 index);
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unsigned long (*recalc_accuracy)(struct clk_hw *hw,
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unsigned long parent_accuracy);
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int (*get_phase)(struct clk_hw *hw);
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int (*set_phase)(struct clk_hw *hw, int degrees);
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void (*init)(struct clk_hw *hw);
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int (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
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