linux-kernel - [PATCH 2/3] firmware: qcom: scm: Remove core, iface and bus clocks dependency

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Date:   Fri, 28 Oct 2016 17:08:48 -0700
From:   Sarangdhar Joshi <spjoshi@...eaurora.org>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Cc:     Sarangdhar Joshi <spjoshi@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Trilok Soni <tsoni@...eaurora.org>
Subject: [PATCH 2/3] firmware: qcom: scm: Remove core, iface and bus clocks dependency

Core, iface and bus clocks are not required to be voted from SCM
driver for some of the Qualcomm chipsets. Remove dependency on
these clocks from driver.

Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Sarangdhar Joshi <spjoshi@...eaurora.org>
---
 drivers/firmware/qcom_scm.c | 65 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 46 insertions(+), 19 deletions(-)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index d79fecd..010a350 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -28,6 +28,10 @@
 
 #include "qcom_scm.h"
 
+#define SCM_HAS_CORE_CLK	BIT(0)
+#define SCM_HAS_IFACE_CLK	BIT(1)
+#define SCM_HAS_BUS_CLK		BIT(2)
+
 struct qcom_scm {
 	struct device *dev;
 	struct clk *core_clk;
@@ -380,33 +384,43 @@ EXPORT_SYMBOL(qcom_scm_is_available);
 static int qcom_scm_probe(struct platform_device *pdev)
 {
 	struct qcom_scm *scm;
+	uint64_t clks;
 	int ret;
 
 	scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
 	if (!scm)
 		return -ENOMEM;
 
-	scm->core_clk = devm_clk_get(&pdev->dev, "core");
-	if (IS_ERR(scm->core_clk)) {
-		if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
-			return PTR_ERR(scm->core_clk);
+	clks = (uint64_t)of_device_get_match_data(&pdev->dev);
+	if (clks & SCM_HAS_CORE_CLK) {
+		scm->core_clk = devm_clk_get(&pdev->dev, "core");
+		if (IS_ERR(scm->core_clk)) {
+			if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
+				return PTR_ERR(scm->core_clk);
 
-		scm->core_clk = NULL;
+			scm->core_clk = NULL;
+		}
 	}
 
 	if (of_device_is_compatible(pdev->dev.of_node, "qcom,scm")) {
-		scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
-		if (IS_ERR(scm->iface_clk)) {
-			if (PTR_ERR(scm->iface_clk) != -EPROBE_DEFER)
-				dev_err(&pdev->dev, "failed to acquire iface clk\n");
-			return PTR_ERR(scm->iface_clk);
+		if (clks & SCM_HAS_IFACE_CLK) {
+			scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
+			if (IS_ERR(scm->iface_clk)) {
+				if (PTR_ERR(scm->iface_clk) != -EPROBE_DEFER)
+					dev_err(&pdev->dev,
+						"failed to acquire iface clk\n");
+				return PTR_ERR(scm->iface_clk);
+			}
 		}
 
-		scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
-		if (IS_ERR(scm->bus_clk)) {
-			if (PTR_ERR(scm->bus_clk) != -EPROBE_DEFER)
-				dev_err(&pdev->dev, "failed to acquire bus clk\n");
-			return PTR_ERR(scm->bus_clk);
+		if (clks & SCM_HAS_BUS_CLK) {
+			scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
+			if (IS_ERR(scm->bus_clk)) {
+				if (PTR_ERR(scm->bus_clk) != -EPROBE_DEFER)
+					dev_err(&pdev->dev,
+						"failed to acquire bus clk\n");
+				return PTR_ERR(scm->bus_clk);
+			}
 		}
 	}
 
@@ -429,10 +443,23 @@ static int qcom_scm_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id qcom_scm_dt_match[] = {
-	{ .compatible = "qcom,scm-apq8064",},
-	{ .compatible = "qcom,scm-msm8660",},
-	{ .compatible = "qcom,scm-msm8960",},
-	{ .compatible = "qcom,scm",},
+	{ .compatible = "qcom,scm-apq8064",
+	  .data = (void *) SCM_HAS_CORE_CLK,
+	},
+	{ .compatible = "qcom,scm-msm8660",
+	  .data = (void *) SCM_HAS_CORE_CLK,
+	},
+	{ .compatible = "qcom,scm-msm8960",
+	  .data = (void *) SCM_HAS_CORE_CLK,
+	},
+	{ .compatible = "qcom,scm-msm8996",
+	  .data = NULL, /* no clocks */
+	},
+	{ .compatible = "qcom,scm",
+	  .data = (void *) ( SCM_HAS_CORE_CLK
+			    | SCM_HAS_IFACE_CLK
+			    | SCM_HAS_BUS_CLK ),
+	},
 	{}
 };
 
-- 
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a Linux Foundation Collaborative Project