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drm/omap: add comments for PLL calculations
Add comments showing how the PLL clock rates are calculated. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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@ -207,6 +207,10 @@ bool dss_pll_hsdiv_calc_a(const struct dss_pll *pll, unsigned long clkdco,
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return false;
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}
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/*
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* clkdco = clkin / n * m * 2
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* clkoutX = clkdco / mX
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*/
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bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin,
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unsigned long pll_min, unsigned long pll_max,
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dss_pll_calc_func func, void *data)
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@ -252,6 +256,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin,
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* This calculates a PLL config that will provide the target_clkout rate
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* for clkout. Additionally clkdco rate will be the same as clkout rate
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* when clkout rate is >= min_clkdco.
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*
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* clkdco = clkin / n * m + clkin / n * mf / 262144
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* clkout = clkdco / m2
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*/
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bool dss_pll_calc_b(const struct dss_pll *pll, unsigned long clkin,
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unsigned long target_clkout, struct dss_pll_clock_info *cinfo)
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