clk: qcom: branch: Add helper functions for setting SLEEP/WAKE bits

HLOS-controlled branch clocks on non-ancient Qualcomm platforms
feature SLEEP and WAKE fields which can be written to to configure
how long the clock hardware should wait internally before being
(un)gated. Some very sensitive clocks need to have these values
programmed to prevent putting the hardware in a not-exactly-good
state. Add definitions of these fields and introduce helpers for
setting them inside clock drivers.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230208091340.124641-3-konrad.dybcio@linaro.org

diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 55b3a2c..b325f94 100644 (file)
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -4,6 +4,7 @@
 #ifndef __QCOM_CLK_BRANCH_H__
 #define __QCOM_CLK_BRANCH_H__
 
+#include <linux/bitfield.h>
 #include <linux/clk-provider.h>
 
 #include "clk-regmap.h"
@@ -41,6 +42,8 @@ struct clk_branch {
 #define CBCR_FORCE_MEM_CORE_ON         BIT(14)
 #define CBCR_FORCE_MEM_PERIPH_ON       BIT(13)
 #define CBCR_FORCE_MEM_PERIPH_OFF      BIT(12)
+#define CBCR_WAKEUP                    GENMASK(11, 8)
+#define CBCR_SLEEP                     GENMASK(7, 4)
 
 static inline void qcom_branch_set_force_mem_core(struct regmap *regmap,
                                                  struct clk_branch clk, bool on)
@@ -63,6 +66,18 @@ static inline void qcom_branch_set_force_periph_off(struct regmap *regmap,
                           on ? CBCR_FORCE_MEM_PERIPH_OFF : 0);
 }
 
+static inline void qcom_branch_set_wakeup(struct regmap *regmap, struct clk_branch clk, u32 val)
+{
+       regmap_update_bits(regmap, clk.halt_reg, CBCR_WAKEUP,
+                          FIELD_PREP(CBCR_WAKEUP, val));
+}
+
+static inline void qcom_branch_set_sleep(struct regmap *regmap, struct clk_branch clk, u32 val)
+{
+       regmap_update_bits(regmap, clk.halt_reg, CBCR_SLEEP,
+                          FIELD_PREP(CBCR_SLEEP, val));
+}
+
 extern const struct clk_ops clk_branch_ops;
 extern const struct clk_ops clk_branch2_ops;
 extern const struct clk_ops clk_branch_simple_ops;