On 11/01/2021 03:18, gene_chen(陳俊宇) wrote:

[ Internal Use - External ]

Hi Matthias,

I discussed OF match table with Mark in previous mail in our PATCH v3,
MFD should just instantiate the platform device.

quoted

Mark Brown [off-list ref] 於 2020年8月20日 週四 下午7:45寫道：

quoted

quoted

This device only exists in the context of a single parent device, there
should be no need for a compatible string here - this is just a detail
of how Linux does things.  The MFD should just instntiate the platform
device.

quoted

Trying to autoload module without of_id_table will cause run-time error:
ueventd: LoadWithAliases was unable to load
of:NregulatorT(null)Cmediatek,mt6360-regulator

You shouldn't have this described in the device tree at all, like I say
the MFD should just instantiate the platform device.

Well with the patch you send to enable regulators [1]  you use OF_MFD_CELL. So
my understanding is, if you don't provide an of_match_table in the regulator
driver, the loading via udev is broken (like you mentioned in the cite from an
older email).

Regards,
Matthias

[1]
https://lore.kernel.org/linux-mediatek/1605177598-23501-5-git-send-email-gene.chen.richtek@gmail.com/ (local)

quoted

-----Original Message-----
From: matthias.bgg@kernel.org <matthias.bgg@kernel.org>
Sent: Saturday, January 9, 2021 7:26 PM
To: Liam Girdwood <lgirdwood@gmail.com>; Mark Brown
[off-list ref]
Cc: Hsin-Hsiung Wang <redacted>; Axel Lin
[off-list ref]; Chen Zhong [off-list ref];
gene_chen(陳俊宇) [off-list ref]; linux-kernel@vger.kernel.org;
linux-mediatek@lists.infradead.org; linux-arm-kernel@lists.infradead.org;
Matthias Brugger [off-list ref]; Matti Vaittinen
[off-list ref]; Matthias Brugger
[off-list ref]
Subject: [PATCH v2 1/3] regulator: mt6360: Add OF match table

From: Matthias Brugger <mbrugger@suse.com>

Binding documentation mentions that a compatible is required for the
MT6360 device node, but the driver doesn't provide a OF match table.

Fixes: d321571d5e4c ("regulator: mt6360: Add support for MT6360 regulator")
Signed-off-by: Matthias Brugger <mbrugger@suse.com>

---

Changes in v2:
- check for CONFIG_OF
- add Fixes tag

 drivers/regulator/mt6360-regulator.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/regulator/mt6360-regulator.c

b/drivers/regulator/mt6360-regulator.c
index 15308ee29c13..f7b2514feabf 100644

--- a/drivers/regulator/mt6360-regulator.c
+++ b/drivers/regulator/mt6360-regulator.c

@@ -445,9 +445,18 @@ static const struct platform_device_id

mt6360_regulator_id_table[] = {  };  MODULE_DEVICE_TABLE(platform,
mt6360_regulator_id_table);

+#ifdef CONFIG_OF
+static const struct of_device_id mt6360_of_match[] = {
+{ .compatible = "mediatek,mt6360-regulator", },
+{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, mt6360_of_match); #endif
+
 static struct platform_driver mt6360_regulator_driver = {
 .driver = {
 .name = "mt6360-regulator",
+.of_match_table = of_match_ptr(mt6360_of_match),
 },
 .probe = mt6360_regulator_probe,
 .id_table = mt6360_regulator_id_table,
--
2.29.2

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