diff options
Diffstat (limited to 'drivers/clk/zynqmp/divider.c')
| -rw-r--r-- | drivers/clk/zynqmp/divider.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c index d8f5b70d2709..da6903197fc7 100644 --- a/drivers/clk/zynqmp/divider.c +++ b/drivers/clk/zynqmp/divider.c @@ -41,6 +41,7 @@ struct zynqmp_clk_divider { bool is_frac; u32 clk_id; u32 div_type; + u16 max_div; }; static inline int zynqmp_divider_get_val(unsigned long parent_rate, @@ -176,6 +177,35 @@ static const struct clk_ops zynqmp_clk_divider_ops = { }; /** + * zynqmp_clk_get_max_divisor() - Get maximum supported divisor from firmware. + * @clk_id: Id of clock + * @type: Divider type + * + * Return: Maximum divisor of a clock if query data is successful + * U16_MAX in case of query data is not success + */ +u32 zynqmp_clk_get_max_divisor(u32 clk_id, u32 type) +{ + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); + struct zynqmp_pm_query_data qdata = {0}; + u32 ret_payload[PAYLOAD_ARG_CNT]; + int ret; + + qdata.qid = PM_QID_CLOCK_GET_MAX_DIVISOR; + qdata.arg1 = clk_id; + qdata.arg2 = type; + ret = eemi_ops->query_data(qdata, ret_payload); + /* + * To maintain backward compatibility return maximum possible value + * (0xFFFF) if query for max divisor is not successful. + */ + if (ret) + return U16_MAX; + + return ret_payload[1]; +} + +/** * zynqmp_clk_register_divider() - Register a divider clock * @name: Name of this clock * @clk_id: Id of clock @@ -215,6 +245,12 @@ struct clk_hw *zynqmp_clk_register_divider(const char *name, div->clk_id = clk_id; div->div_type = nodes->type; + /* + * To achieve best possible rate, maximum limit of divider is required + * while computation. + */ + div->max_div = zynqmp_clk_get_max_divisor(clk_id, nodes->type); + hw = &div->hw; ret = clk_hw_register(NULL, hw); if (ret) { |