linux-kernel - [PATCH] soc: brcmstb: Only register SoC device on STB platforms

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Date:   Tue,  9 Jan 2018 15:54:09 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     arm@...nel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] soc: brcmstb: Only register SoC device on STB platforms

From: Thierry Reding <treding@...dia.com>

After moving the SoC device initialization to an early initcall in
commit f780429adfbc ("soc: brcmstb: biuctrl: Move to early_initcall"),
the Broadcom STB SoC device is registered on all platforms if support
for the device is enabled in the kernel configuration.

This causes an additional SoC device to appear on platforms that already
register a native one. In case of Tegra the STB SoC device is registered
as soc0 (with totally meaningless content in the sysfs attributes) and
causes various scripts and programs to fail because they don't know how
to parse that data.

To fix this, duplicate the check from brcmstb_soc_device_early_init()
that already prevents the code from doing anything nonsensical on non-
STB platforms.

Fixes: f780429adfbc ("soc: brcmstb: biuctrl: Move to early_initcall")
Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/soc/bcm/brcmstb/common.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soc/bcm/brcmstb/common.c b/drivers/soc/bcm/brcmstb/common.c
index 781ada62d0a3..4fe1cb73b39a 100644
--- a/drivers/soc/bcm/brcmstb/common.c
+++ b/drivers/soc/bcm/brcmstb/common.c
@@ -89,8 +89,13 @@ early_initcall(brcmstb_soc_device_early_init);
 static int __init brcmstb_soc_device_init(void)
 {
 	struct soc_device_attribute *soc_dev_attr;
+	struct device_node *sun_top_ctrl;
 	struct soc_device *soc_dev;

+	sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
+	if (!sun_top_ctrl)
+		return -ENODEV;
+
 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 	if (!soc_dev_attr)
 		return -ENOMEM;
-- 
2.15.1