clk: scmi: Add support for get/set duty_cycle operations

Provide the CLK framework callbacks related to get/set clock duty cycle if
the related SCMI clock supports OEM extended configurations.

CC: Michael Turquette <mturquette@baylibre.com>
CC: Stephen Boyd <sboyd@kernel.org>
CC: linux-clk@vger.kernel.org
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240415163649.895268-6-cristian.marussi@arm.com
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index ce0f26ee632fb4f397548f019cb94a1b580adbbc..d86a02563f6c8c329a820748dd0966ba2bc0992e 100644 (file)
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -22,6 +22,7 @@ enum scmi_clk_feats {
        SCMI_CLK_STATE_CTRL_SUPPORTED,
        SCMI_CLK_RATE_CTRL_SUPPORTED,
        SCMI_CLK_PARENT_CTRL_SUPPORTED,
+       SCMI_CLK_DUTY_CYCLE_SUPPORTED,
        SCMI_CLK_FEATS_COUNT
 };
 
@@ -169,6 +170,45 @@ static int scmi_clk_atomic_is_enabled(struct clk_hw *hw)
        return !!enabled;
 }
 
+static int scmi_clk_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
+{
+       int ret;
+       u32 val;
+       struct scmi_clk *clk = to_scmi_clk(hw);
+
+       ret = scmi_proto_clk_ops->config_oem_get(clk->ph, clk->id,
+                                                SCMI_CLOCK_CFG_DUTY_CYCLE,
+                                                &val, NULL, false);
+       if (!ret) {
+               duty->num = val;
+               duty->den = 100;
+       } else {
+               dev_warn(clk->dev,
+                        "Failed to get duty cycle for clock ID %d\n", clk->id);
+       }
+
+       return ret;
+}
+
+static int scmi_clk_set_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
+{
+       int ret;
+       u32 val;
+       struct scmi_clk *clk = to_scmi_clk(hw);
+
+       /* SCMI OEM Duty Cycle is expressed as a percentage */
+       val = (duty->num * 100) / duty->den;
+       ret = scmi_proto_clk_ops->config_oem_set(clk->ph, clk->id,
+                                                SCMI_CLOCK_CFG_DUTY_CYCLE,
+                                                val, false);
+       if (ret)
+               dev_warn(clk->dev,
+                        "Failed to set duty cycle(%u/%u) for clock ID %d\n",
+                        duty->num, duty->den, clk->id);
+
+       return ret;
+}
+
 static int scmi_clk_ops_init(struct device *dev, struct scmi_clk *sclk,
                             const struct clk_ops *scmi_ops)
 {
@@ -258,6 +298,12 @@ scmi_clk_ops_alloc(struct device *dev, unsigned long feats_key)
        if (feats_key & BIT(SCMI_CLK_PARENT_CTRL_SUPPORTED))
                ops->set_parent = scmi_clk_set_parent;
 
+       /* Duty cycle */
+       if (feats_key & BIT(SCMI_CLK_DUTY_CYCLE_SUPPORTED)) {
+               ops->get_duty_cycle = scmi_clk_get_duty_cycle;
+               ops->set_duty_cycle = scmi_clk_set_duty_cycle;
+       }
+
        return ops;
 }
 
@@ -312,6 +358,9 @@ scmi_clk_ops_select(struct scmi_clk *sclk, bool atomic_capable,
        if (!ci->parent_ctrl_forbidden)
                feats_key |= BIT(SCMI_CLK_PARENT_CTRL_SUPPORTED);
 
+       if (ci->extended_config)
+               feats_key |= BIT(SCMI_CLK_DUTY_CYCLE_SUPPORTED);
+
        if (WARN_ON(feats_key >= db_size))
                return NULL;