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authorBaolin Wang <baolin.wang@linaro.org>2017-12-25 14:37:10 +0800
committerMark Brown <broonie@kernel.org>2018-01-12 18:32:55 +0000
commit3bafc09e779710abaa7b836fe3bbeeeab7754c2b (patch)
tree1c78fbe67c3ca13bf771978047d3582079766415 /drivers/mfd
parenta4887813c3a9481ab87c8a71ab1de50b975cc823 (diff)
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@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/syscon.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index b93fe4c4957a..7eaa40bc703f 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -13,6 +13,7 @@
*/
#include <linux/err.h>
+#include <linux/hwspinlock.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/list.h>
@@ -87,6 +88,24 @@ 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 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) {
+ syscon_config.use_hwlock = true;
+ syscon_config.hwlock_id = ret;
+ syscon_config.hwlock_mode = HWLOCK_IRQSTATE;
+ } else if (ret < 0) {
+ switch (ret) {
+ case -ENOENT:
+ /* Ignore missing hwlock, it's optional. */
+ break;
+ default:
+ pr_err("Failed to retrieve valid hwlock: %d\n", ret);
+ /* fall-through */
+ case -EPROBE_DEFER:
+ goto err_regmap;
+ }
+ }
+
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;