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From: Marcel Holtmann <marcel@holtmann.org>
To: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
	Lino Sanfilippo <LinoSanfilippo@gmx.de>,
	"David S. Miller" <davem@davemloft.net>,
	Stefan Wahren <stefan.wahren@i2se.com>,
	Rob Herring <robh@kernel.org>, Johan Hovold <johan@kernel.org>,
	netdev@vger.kernel.org
Subject: Re: [PATCH v2 15/24] net: qualcomm: MODULE_DEVICE_TABLE(serdev)
Date: Mon, 11 Jun 2018 17:28:16 +0200	[thread overview]
Message-ID: <B4BC9DB0-2D7C-4F9D-99FE-8227D4DC3D54@holtmann.org> (raw)
In-Reply-To: <CAPybu_0=ykAcCx=nZyrv90YRfihDxi3s2+Nz+6UP8Fwd5eH2-A@mail.gmail.com>

Hi Marcel,

>> the commit message is misleading me. If I build something with ACPI or DT support, then modinfo will show all modalias information for ACPI and DT compatible strings. What else does udev/modprobe actually need? Is something broken with the modalias export?
> 
> The main purpose is to autoload drivers for devices that have been
> created via sysfs or another module.
> 
> Eg1: We have a serial port on a standard computer that has connected a
> GPS module. Since it is something that is not in the ACPI nor the DT
> table the user will run
> 
> echo serdev_gps > /sys/bus/serial/devices/serial0/new_device
> 
> Eg2 module: https://github.com/ribalda/linux/blob/415bb3f0076c2b846ebe5409589b8e1e3004f55a/drivers/tty/serdev/test_platform.c
> 
> Modprobe does not know what module to load for that device unless
> there is a matching MODULE_DEVICE_TABLE
> Today, we have the same functionality for i2c devices
> https://www.kernel.org/doc/Documentation/i2c/instantiating-devices

but why does this have to be the driver name? I would rather say, create a generic string that describes the hardware and then use that. I think you also want the special handling, as from USB for example, that lets you reference an existing .compatible or ACPI ID as reference so that the driver_data is copied.

Regards

Marcel

  reply	other threads:[~2018-06-11 15:28 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-11 11:52 [PATCH v2 00/19] Dynamically load/remove serdev devices via sysfs* Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 01/24] serdev: Add id_table to serdev_device_driver Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 02/24] Bluetooth: hci_bcm: Add serdev_id_table Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 03/24] Bluetooth: hci_ll: " Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 04/24] Bluetooth: hci_nokia: " Ricardo Ribalda Delgado
2018-06-11 12:56   ` Marcel Holtmann
2018-06-11 13:04     ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 05/24] serdev: Introduce modalias field Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 06/24] serdev: Support bus matching with " Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 07/24] serdev: Allows dynamic creation of devices via sysfs Ricardo Ribalda Delgado
2018-06-11 12:39   ` Andy Shevchenko
2018-06-11 13:03     ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 08/24] serdev: Provide modalias attribute for modalias devices Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 09/24] serdev: Provide modalias uevent " Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 10/24] file2alias: Support for serdev devices Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 11/24] Bluetooth: hci_bcm: MODULE_DEVICE_TABLE(serdev) Ricardo Ribalda Delgado
2018-06-11 12:59   ` Marcel Holtmann
2018-06-11 13:31     ` Andy Shevchenko
2018-06-11 13:31       ` Andy Shevchenko
2018-06-11 11:52 ` [PATCH v2 12/24] Bluetooth: hci_ll: MODULE_DEVICE_TABLE(serdev) Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 13/24] Bluetooth: hci_nokia: MODULE_DEVICE_TABLE(serdev) Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 14/24] mfd: rave-sp: MODULE_DEVICE_TABLE(serdev) Ricardo Ribalda Delgado
2018-06-11 13:14   ` Marcel Holtmann
2018-06-11 15:18     ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 15/24] net: qualcomm: MODULE_DEVICE_TABLE(serdev) Ricardo Ribalda Delgado
2018-06-11 13:01   ` Marcel Holtmann
2018-06-11 15:09     ` Ricardo Ribalda Delgado
2018-06-11 15:28       ` Marcel Holtmann [this message]
2018-06-11 15:33         ` Ricardo Ribalda Delgado
2018-06-11 15:52           ` Marcel Holtmann
2018-06-11 16:21             ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 16/24] serdev: ttyport: Move serport structure to its own header Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 17/24] serdev: Mark controllers compatible with ttyport Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 18/24] serdev: ttydev: Serdev driver that creates an standard TTY port Ricardo Ribalda Delgado
2018-06-13  1:20   ` Rob Herring
2018-06-13  6:35     ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 19/24] serdev: Instantiate a ttydev serdev if acpi and of fails Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 20/24] serdev: Make match_id accessible by drivers Ricardo Ribalda Delgado
2018-06-11 12:47   ` Andy Shevchenko
2018-06-11 13:10     ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 21/24] rave-sp: Support for variants on modalias drivers Ricardo Ribalda Delgado
2018-06-11 12:54   ` Andy Shevchenko
2018-06-11 13:38     ` Marcel Holtmann
2018-06-11 15:21       ` Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 22/24] serdev: Replace IDA functions with IDR Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 23/24] serdev: get/put controller Ricardo Ribalda Delgado
2018-06-11 11:52 ` [PATCH v2 24/24] serdev: serdev_controller_add_probed_device Ricardo Ribalda Delgado
2018-06-14 10:48 ` [PATCH v2 00/19] Dynamically load/remove serdev devices via sysfs* Johan Hovold
2018-06-14 11:06   ` Ricardo Ribalda Delgado
2018-06-14 11:06     ` Ricardo Ribalda Delgado
2018-06-14 13:33     ` Johan Hovold
2018-06-14 14:06       ` Ricardo Ribalda Delgado
2018-06-14 14:55         ` Johan Hovold
2018-06-14 15:20           ` Ricardo Ribalda Delgado
2018-06-14 15:20             ` Ricardo Ribalda Delgado
2018-06-14 15:47             ` Johan Hovold

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