From f2d62c90f2ea05b1abf9a1887502122eefb5906d Mon Sep 17 00:00:00 2001 From: Yong Li 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 --- 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