clk: ti: dpll: add support for specifying max rate for DPLLs
DPLLs typically have a maximum rate they can support, and this varies
from DPLL to DPLL. Add support of the maximum rate value to the DPLL
data struct, and also add check for this in the DPLL round_rate function.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/drivers/clk/ti/clkt_dpll.c b/drivers/clk/ti/clkt_dpll.c
index 032c658..b919fdf 100644
--- a/drivers/clk/ti/clkt_dpll.c
+++ b/drivers/clk/ti/clkt_dpll.c
@@ -301,6 +301,9 @@
dd = clk->dpll_data;
+ if (dd->max_rate && target_rate > dd->max_rate)
+ target_rate = dd->max_rate;
+
ref_rate = clk_hw_get_rate(dd->clk_ref);
clk_name = clk_hw_get_name(hw);
pr_debug("clock: %s: starting DPLL round_rate, target rate %lu\n",
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index dc5164a..6110fe0 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h
@@ -37,6 +37,7 @@
* @last_rounded_n: cache of the last N result of omap2_dpll_round_rate()
* @min_divider: minimum valid non-bypass divider value (actual)
* @max_divider: maximum valid non-bypass divider value (actual)
+ * @max_rate: maximum clock rate for the DPLL
* @modes: possible values of @enable_mask
* @autoidle_reg: register containing the DPLL autoidle mode bitfield
* @idlest_reg: register containing the DPLL idle status bitfield
@@ -81,6 +82,7 @@
u8 last_rounded_n;
u8 min_divider;
u16 max_divider;
+ unsigned long max_rate;
u8 modes;
void __iomem *autoidle_reg;
void __iomem *idlest_reg;