linux-kernel - [PATCH] hwrng: meson: Fix module autoload for OF registration

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Message-Id: <1476733214-19044-1-git-send-email-javier@osg.samsung.com>
Date:   Mon, 17 Oct 2016 16:40:14 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     linux-kernel@...r.kernel.org
Cc:     Javier Martinez Canillas <javier@....samsung.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Peter Huewe <peterhuewe@....de>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        tpmdd-devel@...ts.sourceforge.net,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Carlo Caione <carlo@...one.org>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-amlogic@...ts.infradead.org, Matt Mackall <mpm@...enic.com>,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org
Subject: [PATCH] hwrng: meson: Fix module autoload for OF registration

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/char/hw_random/meson-rng.ko | grep alias
alias:          platform:meson-rng

After this patch:

$ modinfo drivers/char/hw_random/meson-rng.ko | grep alias
alias:          platform:meson-rng
alias:          of:N*T*Camlogic,meson-rngC*
alias:          of:N*T*Camlogic,meson-rng

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

 drivers/char/hw_random/meson-rng.c | 1 +
 drivers/char/tpm/Kconfig           | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c
index 58bef39f7286..51864a509be7 100644
--- a/drivers/char/hw_random/meson-rng.c
+++ b/drivers/char/hw_random/meson-rng.c
@@ -110,6 +110,7 @@ static const struct of_device_id meson_rng_of_match[] = {
 	{ .compatible = "amlogic,meson-rng", },
 	{},
 };
+MODULE_DEVICE_TABLE(of, meson_rng_of_match);
 
 static struct platform_driver meson_rng_driver = {
 	.probe	= meson_rng_probe,
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index 9faa0b1e7766..982ed2fe927c 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -32,7 +32,7 @@ config TCG_TIS_CORE
 
 config TCG_TIS
 	tristate "TPM Interface Specification 1.2 Interface / TPM 2.0 FIFO Interface"
-	depends on X86
+	depends on X86 || COMPILE_TEST
 	select TCG_TIS_CORE
 	---help---
 	  If you have a TPM security chip that is compliant with the
-- 
2.7.4