Re: [PATCH 4/5] hwmon: (pmbus/core) improve handling of write protected regulators

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On 9/23/24 06:21, Mark Brown wrote:
On Fri, Sep 20, 2024 at 06:47:05PM +0200, Jerome Brunet wrote:

+int pmbus_regulator_init_cb(struct regulator_dev *rdev,
+			    struct regulator_config *config)
+{
+	struct pmbus_data *data = config->driver_data;
+	struct regulation_constraints *constraints = rdev->constraints;
+
+	if (data->flags & PMBUS_OP_PROTECTED)
+		constraints->valid_ops_mask &= ~REGULATOR_CHANGE_STATUS;
+
+	if (data->flags & PMBUS_VOUT_PROTECTED)
+		constraints->valid_ops_mask &= ~REGULATOR_CHANGE_VOLTAGE;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(pmbus_regulator_init_cb, PMBUS);

I'm fairly comfortable with this from a regulator point of view, modulo
the suggestion I posted in the other message about registering separate
ops.  The fact that there's three combinations of ops is annoying but
doesn't feel too bad, though I didn't actually write it out so perhaps
it looks horrible.  In general removing permissions is safe, and without
separate steps to remove write protect (which I see in your patch 5) the
writes wouldn't actually work anyway.


I still consider the callback to be unnecessary, but I don't really have time
to implement a better solution myself. If you accept the regulator patches,
I'll have another look at the series as-is.

Guenter





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