thermal: qcom: tsens: Allow number of sensors to come from DT

Message ID 20180507235339.8836-1-bjorn.andersson@linaro.org
State New
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Series
  • thermal: qcom: tsens: Allow number of sensors to come from DT
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Commit Message

Bjorn Andersson May 7, 2018, 11:53 p.m.
For platforms that has multiple copies of the TSENS hardware block it's
necessary to be able to specify the number of sensors per block in DeviceTree.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

---
 .../devicetree/bindings/thermal/qcom-tsens.txt       |  1 +
 drivers/thermal/qcom/tsens.c                         | 12 +++++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

-- 
2.17.0

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Comments

Bjorn Andersson May 14, 2018, 5:46 p.m. | #1
On Mon 14 May 07:45 PDT 2018, Amit Kucheria wrote:

> On Tue, May 8, 2018 at 2:53 AM, Bjorn Andersson

> <bjorn.andersson@linaro.org> wrote:

> > For platforms that has multiple copies of the TSENS hardware block it's

> > necessary to be able to specify the number of sensors per block in DeviceTree.

> 

> I assume you want to replace the hardcoded num_sensors values in the

> tsens-xxxx.c files with values in device tree atleast on platforms

> that use devicetree?

> 


Right, e.g. in msm8998 we have two blocks with 12 and 8 sensors
respectively. With the patch we will overwrite the num_sensors with a
value from DT, iff specified.

As probe will fail if num_sensors is 0 we can reuse ops_8996 and just
not provide num_sensors for 8998, hence requiring it to be specified in
DT.


PS. Looking at the register spec 8996 too seems to have two tsens
blocks, so in order to access sensors off the second bank this patch
would be needed (and would work and be backwards compatible).

Regards,
Bjorn
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Rob Herring May 22, 2018, 8:14 p.m. | #2
On Mon, May 07, 2018 at 04:53:39PM -0700, Bjorn Andersson wrote:
> For platforms that has multiple copies of the TSENS hardware block it's

> necessary to be able to specify the number of sensors per block in DeviceTree.

> 

> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> ---

>  .../devicetree/bindings/thermal/qcom-tsens.txt       |  1 +


Reviewed-by: Rob Herring <robh@kernel.org>


>  drivers/thermal/qcom/tsens.c                         | 12 +++++++++---

>  2 files changed, 10 insertions(+), 3 deletions(-)

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Patch

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..20f3b87d7667 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 +131,23 @@  static int tsens_probe(struct platform_device *pdev)
 	else
 		data = &data_8960;
 
-	if (data->num_sensors <= 0) {
+	num_sensors = data->num_sensors;
+
+	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)