linux-kernel - [PATCH -next] soc: brcmstb: biuctrl: exit without warning on non brcmstb platforms

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Date:   Thu, 11 Jan 2018 14:39:24 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: [PATCH -next] soc: brcmstb: biuctrl: exit without warning on non brcmstb platforms

Currently if this driver is included, we get the following warning
on any platforms irrespective of whether it's brcmstb platform or not.
"
 brcmstb: biuctrl: missing BIU control node
 brcmstb: biuctrl: MCP: Unable to disable write pairing!
"

This patch allows to exit early without any warning messages on non
brcmstb platforms as it's meaningless for them.

Cc: Brian Norris <computersforpeace@...il.com>
Cc: Gregory Fong <gregory.0xf0@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: bcm-kernel-feedback-list@...adcom.com
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/soc/bcm/brcmstb/biuctrl.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

Hi,

I am seeing these messages on my Juno platform when running -next

Regards,
Sudeep

diff --git a/drivers/soc/bcm/brcmstb/biuctrl.c b/drivers/soc/bcm/brcmstb/biuctrl.c
index 2b23ae7b5e9b..0d0c6131ac0e 100644
--- a/drivers/soc/bcm/brcmstb/biuctrl.c
+++ b/drivers/soc/bcm/brcmstb/biuctrl.c
@@ -162,17 +162,11 @@ static void __init mcp_b53_set(void)
 	cbc_writel(reg, CPU_WRITEBACK_CTRL_REG);
 }
 
-static int __init setup_hifcpubiuctrl_regs(void)
+static int __init setup_hifcpubiuctrl_regs(struct device_node *np)
 {
-	struct device_node *np, *cpu_dn;
+	struct device_node *cpu_dn;
 	int ret = 0;
 
-	np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");
-	if (!np) {
-		pr_err("missing BIU control node\n");
-		return -ENODEV;
-	}
-
 	cpubiuctrl_base = of_iomap(np, 0);
 	if (!cpubiuctrl_base) {
 		pr_err("failed to remap BIU control base\n");
@@ -243,8 +237,13 @@ static struct syscore_ops brcmstb_cpu_credit_syscore_ops = {
 static int __init brcmstb_biuctrl_init(void)
 {
 	int ret;
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");
+	if (!np)
+		return -ENODEV;
 
-	setup_hifcpubiuctrl_regs();
+	setup_hifcpubiuctrl_regs(np);
 
 	ret = mcp_write_pairing_set();
 	if (ret) {
-- 
2.7.4