To support a readonly divider add the CLK_DIVIDER_READ_ONLY flag.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/clk/clk-divider.c | 7 +++++++
drivers/clk/rockchip/clk-rk3188.c | 1 -
drivers/clk/rockchip/clk-rk3288.c | 1 -
include/linux/clk.h | 1 +
4 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 407aae78ea..d9d3407e75 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -203,8 +203,12 @@ static int clk_divider_bestdiv(struct clk *clk, unsigned long rate,
static long clk_divider_round_rate(struct clk *clk, unsigned long rate,
unsigned long *parent_rate)
{
+ struct clk_divider *divider = container_of(clk, struct clk_divider, clk);
int div;
+ if (divider->flags & CLK_DIVIDER_READ_ONLY)
+ return clk_divider_recalc_rate(clk, *parent_rate);
+
div = clk_divider_bestdiv(clk, rate, parent_rate);
return *parent_rate / div;
@@ -217,6 +221,9 @@ static int clk_divider_set_rate(struct clk *clk, unsigned long rate,
unsigned int div, value;
u32 val;
+ if (divider->flags & CLK_DIVIDER_READ_ONLY)
+ return 0;
+
if (clk->flags & CLK_SET_RATE_PARENT) {
unsigned long best_parent_rate = parent_rate;
div = clk_divider_bestdiv(clk, rate, &best_parent_rate);
diff --git a/drivers/clk/rockchip/clk-rk3188.c b/drivers/clk/rockchip/clk-rk3188.c
index 7dda2963e3..8ed3a6d894 100644
--- a/drivers/clk/rockchip/clk-rk3188.c
+++ b/drivers/clk/rockchip/clk-rk3188.c
@@ -26,7 +26,6 @@
#define RK3188_GRF_SOC_STATUS 0xac
#define CLK_SET_RATE_NO_REPARENT 0
-#define CLK_DIVIDER_READ_ONLY 0
enum rk3188_plls {
apll, cpll, dpll, gpll,
diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c
index bb111e1e0b..e7cc9c1b5b 100644
--- a/drivers/clk/rockchip/clk-rk3288.c
+++ b/drivers/clk/rockchip/clk-rk3288.c
@@ -26,7 +26,6 @@
#define RK3288_GRF_SOC_STATUS1 0x284
#define CLK_SET_RATE_NO_REPARENT 0
-#define CLK_DIVIDER_READ_ONLY 0
enum rk3288_plls {
apll, dpll, cpll, gpll, npll,
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 65d163c78d..2de963e7e9 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -341,6 +341,7 @@ struct clk_divider {
#define CLK_DIVIDER_POWER_OF_TWO (1 << 1)
#define CLK_DIVIDER_HIWORD_MASK (1 << 3)
+#define CLK_DIVIDER_READ_ONLY (1 << 5)
#define CLK_MUX_HIWORD_MASK (1 << 2)
--
2.20.1
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