memory: samsung: exynos5422-dmc: Document mutex scope

Document scope of the mutex used by driver.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://lore.kernel.org/r/20200724180857.22119-1-krzk@kernel.org

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 952bc61..0045fa5 100644 (file)
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -119,6 +119,7 @@ struct exynos5_dmc {
        void __iomem *base_drexi0;
        void __iomem *base_drexi1;
        struct regmap *clk_regmap;
+       /* Protects curr_rate and frequency/voltage setting section */
        struct mutex lock;
        unsigned long curr_rate;
        unsigned long curr_volt;