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From f2d62c90f2ea05b1abf9a1887502122eefb5906d Mon Sep 17 00:00:00 2001
From: Yong Li <yong.b.li@linux.intel.com>
Date: Wed, 16 Oct 2019 15:11:06 +0800
Subject: [PATCH] soc: aspeed: Add read-only property support
Add a read-only property, to support export register bits as read-only.
Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
---
drivers/soc/aspeed/aspeed-bmc-misc.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/soc/aspeed/aspeed-bmc-misc.c b/drivers/soc/aspeed/aspeed-bmc-misc.c
index 314007b..bf88376 100644
--- a/drivers/soc/aspeed/aspeed-bmc-misc.c
+++ b/drivers/soc/aspeed/aspeed-bmc-misc.c
@@ -15,6 +15,7 @@ struct aspeed_bmc_ctrl {
u32 offset;
u32 mask;
u32 shift;
+ bool read_only;
struct regmap *map;
struct kobj_attribute attr;
};
@@ -55,6 +56,8 @@ static int aspeed_bmc_misc_parse_dt_child(struct device_node *child,
if (rc < 0)
return rc;
+ ctrl->read_only = of_property_read_bool(child, "read-only");
+
ctrl->mask <<= ctrl->shift;
return 0;
@@ -116,6 +119,10 @@ static ssize_t aspeed_bmc_misc_store(struct kobject *kobj,
return rc;
ctrl = container_of(attr, struct aspeed_bmc_ctrl, attr);
+
+ if (ctrl->read_only)
+ return -EROFS;
+
val <<= ctrl->shift;
rc = regmap_update_bits(ctrl->map, ctrl->offset, ctrl->mask, val);
--
2.7.4
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