/**
* omap4_dpll_regm4xen_determine_rate - determine rate for a DPLL
* @hw: pointer to the clock to determine rate for
* @req: target rate request
*
* Determines which DPLL mode to use for reaching a desired rate.
* Checks whether the DPLL shall be in bypass or locked mode, and if
* locked, calculates the M,N values for the DPLL via round-rate.
* Returns 0 on success and a negative error value otherwise.
*/
int omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
struct dpll_data *dd;
if (!req->rate)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
if (clk_get_rate(dd->clk_bypass) == req->rate &&
(dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
req->best_parent_hw = __clk_get_hw(dd->clk_bypass);
} else {
req->rate = omap4_dpll_regm4xen_round_rate(hw, req->rate,
&req->best_parent_rate);
req->best_parent_hw = __clk_get_hw(dd->clk_ref);
}
req->best_parent_rate = req->rate;
return 0;
}
/**
* omap4_dpll_regm4xen_determine_rate - determine rate for a DPLL
* @hw: pointer to the clock to determine rate for
* @rate: target rate for the DPLL
* @best_parent_rate: pointer for returning best parent rate
* @best_parent_clk: pointer for returning best parent clock
*
* Determines which DPLL mode to use for reaching a desired rate.
* Checks whether the DPLL shall be in bypass or locked mode, and if
* locked, calculates the M,N values for the DPLL via round-rate.
* Returns a positive clock rate with success, negative error value
* in failure.
*/
long omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *best_parent_rate,
struct clk **best_parent_clk)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
struct dpll_data *dd;
if (!hw || !rate)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
if (__clk_get_rate(dd->clk_bypass) == rate &&
(dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
*best_parent_clk = dd->clk_bypass;
} else {
rate = omap4_dpll_regm4xen_round_rate(hw, rate,
best_parent_rate);
*best_parent_clk = dd->clk_ref;
}
*best_parent_rate = rate;
return rate;
}
