linux-kernel - [PATCH 2/2] mfd: syscon: Add hardware spinlock support

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Date:   Tue, 31 Oct 2017 14:35:56 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     broonie@...nel.org, gregkh@...uxfoundation.org,
        lee.jones@...aro.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, baolin.wang@...aro.org
Subject: [PATCH 2/2] mfd: syscon: Add hardware spinlock support

Some system control registers need hardware spinlock to synchronize
between the multiple subsystems, so we should add hardware spinlock
support for syscon.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/mfd/syscon.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index b93fe4c..adc1c9c 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -25,6 +25,8 @@
 #include <linux/mfd/syscon.h>
 #include <linux/slab.h>
 
+#define SYSCON_HWSPINLOCK_TIMEOUT	(~0U)
+
 static struct platform_driver syscon_driver;
 
 static DEFINE_SPINLOCK(syscon_list_slock);
@@ -87,6 +89,13 @@ static struct syscon *of_syscon_register(struct device_node *np)
 	if (ret)
 		reg_io_width = 4;
 
+	ret = of_hwspin_lock_get_id(np, 0);
+	if (ret > 0) {
+		syscon_config.hwlock_id = ret;
+		syscon_config.hwlock_mode = HWLOCK_IRQSTATE;
+		syscon_config.hwlock_timeout = SYSCON_HWSPINLOCK_TIMEOUT;
+	}
+
 	syscon_config.reg_stride = reg_io_width;
 	syscon_config.val_bits = reg_io_width * 8;
 	syscon_config.max_register = resource_size(&res) - reg_io_width;
-- 
1.7.9.5