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path: root/drivers/clk/sunxi-ng/ccu-sun8i-r40.c
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Diffstat (limited to 'drivers/clk/sunxi-ng/ccu-sun8i-r40.c')
-rw-r--r--drivers/clk/sunxi-ng/ccu-sun8i-r40.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-r40.c b/drivers/clk/sunxi-ng/ccu-sun8i-r40.c
index 582ebd41d20d..a22d11aa38ba 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-r40.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-r40.c
@@ -1284,6 +1284,9 @@ static struct regmap_config sun8i_r40_ccu_regmap_config = {
.writeable_reg = sun8i_r40_ccu_regmap_accessible_reg,
};
+#define SUN8I_R40_SYS_32K_CLK_REG 0x310
+#define SUN8I_R40_SYS_32K_CLK_KEY (0x16AA << 16)
+
static int sun8i_r40_ccu_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -1312,6 +1315,14 @@ static int sun8i_r40_ccu_probe(struct platform_device *pdev)
val &= ~GENMASK(25, 20);
writel(val, reg + SUN8I_R40_USB_CLK_REG);
+ /*
+ * Force SYS 32k (otherwise known as LOSC throughout the CCU)
+ * clock parent to LOSC output from RTC module instead of the
+ * CCU's internal RC oscillator divided output.
+ */
+ writel(SUN8I_R40_SYS_32K_CLK_KEY | BIT(8),
+ reg + SUN8I_R40_SYS_32K_CLK_REG);
+
regmap = devm_regmap_init_mmio(&pdev->dev, reg,
&sun8i_r40_ccu_regmap_config);
if (IS_ERR(regmap))