linux-kernel - [PATCH v6 02/10] clk: qcom: branch: Add helper functions for setting SLEEP/WAKE bits

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Date:   Wed,  8 Feb 2023 10:13:32 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     marijn.suijten@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 02/10] 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@...aro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/clk-branch.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 55b3a2c3afed..b325f943c3e0 100644
--- 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;
-- 
2.39.1