kernel at martin.sperl.org writes:

From: Martin Sperl <redacted>

Add basic thermal driver for bcm2835 SOC.

This driver currently relies on the firmware setting up the
tsense HW block and does not set it up itself.

Signed-off-by: Martin Sperl <redacted>

ChangeLog:
 V1 -> V2: added specific settings depending on compatiblity
	   added trip point based on register
	   setting up ctrl-register if HW is not enabled by firmware
	     as per recommendation of Eric (untested)
	   check that clock frequency is in range
	     (1.9 - 5MHz - as per comment in clk-bcm2835.c)
---

+static const struct of_device_id bcm2835_thermal_of_match_table[];
+static int bcm2835_thermal_probe(struct platform_device *pdev)
+{

+	/* enable clock and check rate */
+	clk_prepare_enable(data->clk);
+	rate = clk_get_rate(data->clk);
+	if ((rate < 1920000) || (rate > 5000000)) {
+		dev_warn(&pdev->dev,
+			 "Clock %pCn is running at %pCr Hz, which is outside the recommended range of 1.9 to 5.0 MHz\n",
+			 data->clk, data->clk);
+	}
+
+	/* register it */
+	tz = thermal_zone_device_register("bcm2835_thermal",
+					  1, 0, data,
+					  &bcm2835_thermal_ops,
+					  NULL, 0, 0);

I notice that the polling_delay is set to 0, but we're not using
interrupts to trigger the trip.  Is it valid to expose a trip without a
polling_delay or interrupts?  Should passive_delay be set as well?

This is up to the thermal maintainers.  As far as I'm concerned, it's:

Acked-by: Eric Anholt <redacted>

One it lands I'll pull the defconfig and DT bits.
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