linux-kernel - [PATCH v2] thermal: qcom: tsens: Allow number of sensors to come from DT

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Date:   Sat,  2 Jun 2018 12:32:11 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2] thermal: qcom: tsens: Allow number of sensors to come from DT

For platforms that has multiple copies of the TSENS hardware block it's
convenient to specify the number of sensors per block in DeviceTree.

Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
Reviewed-by: Rob Herring <robh@...nel.org> [binding]
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes since v1:
- Added comment as suggested by Amit
- Picked up Amit and Rob's R-b

 .../devicetree/bindings/thermal/qcom-tsens.txt      |  1 +
 drivers/thermal/qcom/tsens.c                        | 13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
index 292ed89d900b..06195e8f35e2 100644
--- a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
+++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
@@ -8,6 +8,7 @@ Required properties:
 
 - reg: Address range of the thermal registers
 - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description.
+- #qcom,sensors: Number of sensors in tsens block
 - Refer to Documentation/devicetree/bindings/nvmem/nvmem.txt to know how to specify
 nvmem cells
 
diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
index 3f9fe6aa51cc..b212bebcfc36 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -116,6 +116,7 @@ static int tsens_probe(struct platform_device *pdev)
 	struct tsens_device *tmdev;
 	const struct tsens_data *data;
 	const struct of_device_id *id;
+	u32 num_sensors;
 
 	if (pdev->dev.of_node)
 		dev = &pdev->dev;
@@ -130,18 +131,24 @@ static int tsens_probe(struct platform_device *pdev)
 	else
 		data = &data_8960;
 
-	if (data->num_sensors <= 0) {
+	num_sensors = data->num_sensors;
+
+	/* Override driver provided num_sensors, if specified in DT */
+	if (np)
+		of_property_read_u32(np, "#qcom,sensors", &num_sensors);
+
+	if (num_sensors <= 0) {
 		dev_err(dev, "invalid number of sensors\n");
 		return -EINVAL;
 	}
 
 	tmdev = devm_kzalloc(dev, sizeof(*tmdev) +
-			     data->num_sensors * sizeof(*s), GFP_KERNEL);
+			     num_sensors * sizeof(*s), GFP_KERNEL);
 	if (!tmdev)
 		return -ENOMEM;
 
 	tmdev->dev = dev;
-	tmdev->num_sensors = data->num_sensors;
+	tmdev->num_sensors = num_sensors;
 	tmdev->ops = data->ops;
 	for (i = 0;  i < tmdev->num_sensors; i++) {
 		if (data->hw_ids)
-- 
2.17.0