linux-kernel - Re: [PATCH v1] hwmon: drivetemp: support to be a platform driver for thermal

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Date:   Thu, 16 Mar 2023 14:17:34 +0000
From:   Phinex Hung <phinex@...ltek.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        "jdelvare@...e.com" <jdelvare@...e.com>
CC:     "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] hwmon: drivetemp: support to be a platform driver for thermal_of



On 3/16/23 22:48, Guenter Roeck wrote:


>That needs to be in the hwmon core. We can not change the device pointer
>passed to hwmon_device_register_with_info() because that determines the
>lifetime of the hwmon device.


>Guenter

Do you mean something like below?

Or is it reasonable that we just match a specific compatible string and assign the device node to the original dev->parent used in drivetemp_add function ?

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 33edb5c02f7d..a76beeada33e 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -757,6 +757,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
        struct hwmon_device *hwdev;
        const char *label;
        struct device *hdev;
+       struct device *tedv = dev;
        int i, err, id;

        /* Complain about invalid characters in hwmon name attribute */
@@ -826,7 +827,9 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
        hwdev->name = name;
        hdev->class = &hwmon_class;
        hdev->parent = dev;
-       hdev->of_node = dev ? dev->of_node : NULL;
+       while(!tdev->of_node)
+               tdev = tdev->parent;
+       hdev->of_node = tdev ? tdev->of_node : NULL;
        hwdev->chip = chip;
        dev_set_drvdata(hdev, drvdata);
@@ -838,7 +841,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,

        INIT_LIST_HEAD(&hwdev->tzdata);

-       if (dev && dev->of_node && chip && chip->ops->read &&
+       if (tdev && tdev->of_node && chip && chip->ops->read &&
            chip->info[0]->type == hwmon_chip &&
            (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
                err = hwmon_thermal_register_sensors(hdev);

Regards,
Phinex