linux-kernel - [PATCH v5 19/21] hwmon: (mr75203) parse temperature coefficients from device-tree

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Date:   Thu, 8 Sep 2022 15:24:47 +0000
From:   Eliav Farber <farbere@...zon.com>
To:     <jdelvare@...e.com>, <linux@...ck-us.net>, <robh+dt@...nel.org>,
        <p.zabel@...gutronix.de>, <rtanwar@...linear.com>,
        <andriy.shevchenko@...el.com>, <linux-hwmon@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <farbere@...zon.com>, <hhhawa@...zon.com>, <jonnyc@...zon.com>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v5 19/21] hwmon: (mr75203) parse temperature coefficients from device-tree

Use thermal coefficients from the device tree if they exist.
Otherwise, use default values according to the series (5 or 6).
All coefficients can be used or only part of them.

The coefficients shall be used for fine tuning the default values since
coefficients can vary between product and product.

Signed-off-by: Eliav Farber <farbere@...zon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
V4 -> V3:
- Replace of_property_read_u32() with device_property_read_u32().
- Fix "Code shouldn't be a YAML validator".
- Read directly to ts_coeff-> parameter to avoid conditional if.

 drivers/hwmon/mr75203.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index bbb59dd7e7cb..07668545c3ae 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -719,6 +719,15 @@ static int pvt_set_temp_coeff(struct device *dev, struct pvt_device *pvt)
 
 	dev_dbg(dev, "temperature sensor series = %u\n", series);
 
+	/* Override ts-coeff-h/g/j/cal5 if they are defined. */
+	device_property_read_u32(dev, "moortec,ts-coeff-h", &ts_coeff->h);
+	device_property_read_u32(dev, "moortec,ts-coeff-g", &ts_coeff->g);
+	device_property_read_u32(dev, "moortec,ts-coeff-j", &ts_coeff->j);
+	device_property_read_u32(dev, "moortec,ts-coeff-cal5", &ts_coeff->cal5);
+
+	dev_dbg(dev, "ts-coeff: h = %u, g = %u, j = %d, cal5 = %u\n",
+		ts_coeff->h, ts_coeff->g, ts_coeff->j, ts_coeff->cal5);
+
 	return 0;
 }
 
-- 
2.37.1