clk/zynqmp/divider.c

7  * Adjustable divider clock implementation
16  * DOC: basic adjustable divider clock that cannot gate
32  * struct zynqmp_clk_divider - adjustable divider clock
35  * @is_frac:	The divider is a fractional divider
73  * zynqmp_clk_divider_recalc_rate() - Recalc rate of divider clock
82 	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
84 	u32 clk_id = divider->clk_id;
85 	u32 div_type = divider->div_type;
92 		pr_debug("%s() get divider failed for %s, ret = %d\n",
100 	if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
104 		WARN(!(divider->flags & CLK_DIVIDER_ALLOW_ZERO),
114  * zynqmp_clk_divider_round_rate() - Round rate of divider clock
125 	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
127 	u32 clk_id = divider->clk_id;
128 	u32 div_type = divider->div_type;
134 	if (divider->flags & CLK_DIVIDER_READ_ONLY) {
138 			pr_debug("%s() get divider failed for %s, ret = %d\n",
145 		if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
151 	width = fls(divider->max_div);
153 	rate = divider_round_rate(hw, rate, prate, NULL, width, divider->flags);
155 	if (divider->is_frac && (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) && (rate % *prate))
162  * zynqmp_clk_divider_set_rate() - Set rate of divider clock
172 	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
174 	u32 clk_id = divider->clk_id;
175 	u32 div_type = divider->div_type;
179 	value = zynqmp_divider_get_val(parent_rate, rate, divider->flags);
188 	if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
194 		pr_debug("%s() set divider failed for %s, ret = %d\n",
263  * zynqmp_clk_register_divider() - Register a divider clock
270  * Return: clock hardware to registered clock divider
283 	/* allocate the divider */
308 	 * To achieve best possible rate, maximum limit of divider is required