dev_freq: devfreq_spdm: make cci_clk optional indicator

Enable dev_freq SPDM support in order to increase BIMC
vote based on bus rejection rate. Make cci_clk an optional
property as it's not always a relevant indicator of cpu performance.

CRs-Fixed: 1025515
Change-Id: I713cc396c8d563735981547e0dc18a63f6f15180
Signed-off-by: David Dai <daidavid1@codeaurora.org>

Documentation/devicetree/bindings/devfreq/devfreq-spdm.txt

@@ -6,9 +6,6 @@ hardware to measure the traffic status of configured master ports on the bus.
 
 Required properties:
 -compatible:			Must be "qcom,devfreq_spdm"
--clock-names:			Clocks used to measure current bus frequency.
-				Expected names are "cci_clk"
--clocks:			References to named clocks
 -qcom,spdm-client:		Client id of the port being monitored
 -qcom,bw-upstep:		Initial up vote size in MB/s
 -qcom,bw-dwnstep:		Initial down vote size in MB/s
@@ -31,6 +28,11 @@ Required properties:
 -qcom,up-step-multp:		used to increase rate of growth on up votes
 -qcom,spdm-interval:		down-vote polling interval
 
+Optional properties:
+-clock-names:			Clocks used to measure current bus frequency.
+				Expected names are "cci_clk"
+-clocks:			References to named clocks
+
 Example:
 devfreq_spdm_cpu {
 	compatible = "qcom,devfreq_spdm";

drivers/devfreq/devfreq_spdm.c

@@ -70,7 +70,12 @@ static int change_bw(struct device *dev, unsigned long *freq, u32 flags)
 update_thresholds:
 	desc.arg[0] = SPDM_CMD_ENABLE;
 	desc.arg[1] = data->spdm_client;
-	desc.arg[2] = (clk_get_rate(data->cci_clk)) / 1000;
+
+	if (data->cci_clk)
+		desc.arg[2] = (clk_get_rate(data->cci_clk)) / 1000;
+	else
+		desc.arg[2] = 0;
+
 	ext_status = spdm_ext_call(&desc, 3);
 	if (ext_status)
 		pr_err("External command %u failed with error %u",
@@ -339,8 +344,7 @@ static int probe(struct platform_device *pdev)
 
 	data->cci_clk = clk_get(&pdev->dev, "cci_clk");
 	if (IS_ERR(data->cci_clk)) {
-		ret = PTR_ERR(data->cci_clk);
-		goto no_clock;
+		data->cci_clk = NULL;
 	}
 
 	data->profile =
@@ -376,7 +380,6 @@ static int probe(struct platform_device *pdev)
 no_spdm_device:
 	devm_kfree(&pdev->dev, data->profile);
 no_profile:
-no_clock:
 	msm_bus_scale_unregister_client(data->bus_scale_client_id);
 no_bus_scaling:
 	devm_kfree(&pdev->dev, data->config_data.ports);

drivers/devfreq/governor_spdm_bw_hyp.c

@@ -361,7 +361,7 @@ static int probe(struct platform_device *pdev)
 
 	*irq = platform_get_irq_byname(pdev, "spdm-irq");
 	ret = request_threaded_irq(*irq, isr, threaded_isr,
-				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+				   IRQF_ONESHOT,
 				   spdm_hyp_gov.name, pdev);
 	if (ret)
 		goto no_irq;