linux-kernel - [PATCH] rtc: asm9260: fix module autoload

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Message-Id: <1476450935-19105-1-git-send-email-javier@osg.samsung.com>
Date:   Fri, 14 Oct 2016 10:15:35 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     linux-kernel@...r.kernel.org
Cc:     Javier Martinez Canillas <javier@....samsung.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        rtc-linux@...glegroups.com, Alessandro Zummo <a.zummo@...ertech.it>
Subject: [PATCH] rtc: asm9260: fix module autoload

If the driver is built as a module, autoload won't work because the module
alias information is not filled so user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/rtc/rtc-asm9260.ko | grep alias
$

After this patch:

$ modinfo drivers/rtc/rtc-asm9260.ko | grep alias
alias:          of:N*T*Calphascale,asm9260-rtcC*
alias:          of:N*T*Calphascale,asm9260-rtc

Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
---

 drivers/rtc/rtc-asm9260.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/rtc-asm9260.c b/drivers/rtc/rtc-asm9260.c
index 18a93d3e3f93..d36534965635 100644
--- a/drivers/rtc/rtc-asm9260.c
+++ b/drivers/rtc/rtc-asm9260.c
@@ -327,6 +327,7 @@ static const struct of_device_id asm9260_dt_ids[] = {
 	{ .compatible = "alphascale,asm9260-rtc", },
 	{}
 };
+MODULE_DEVICE_TABLE(of, asm9260_dt_ids);
 
 static struct platform_driver asm9260_rtc_driver = {
 	.probe		= asm9260_rtc_probe,
-- 
2.7.4