linux-kernel - [PATCH 1/3] clk: qcom: alpha: Add support for programming the PLL_FSM_LEGACY

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Date:   Sat, 16 Jul 2022 21:22:35 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     ~postmarketos/upstreaming@...ts.sr.ht
Cc:     martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] clk: qcom: alpha: Add support for programming the PLL_FSM_LEGACY_MODE bit

This is used on at least SM6375 and its variations.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
---
 drivers/clk/qcom/clk-alpha-pll.c | 5 +++++
 drivers/clk/qcom/clk-alpha-pll.h | 5 +++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index b42684703fbb..ea157723906a 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -27,6 +27,7 @@
 # define PLL_VOTE_FSM_RESET	BIT(21)
 # define PLL_UPDATE		BIT(22)
 # define PLL_UPDATE_BYPASS	BIT(23)
+# define PLL_FSM_LEGACY_MODE	BIT(24)
 # define PLL_OFFLINE_ACK	BIT(28)
 # define ALPHA_PLL_ACK_LATCH	BIT(29)
 # define PLL_ACTIVE_FLAG	BIT(30)
@@ -1102,6 +1103,10 @@ void clk_fabia_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
 		regmap_update_bits(regmap, PLL_USER_CTL(pll), mask, val);
 	}
 
+	if (pll->flags & SUPPORTS_FSM_LEGACY_MODE)
+		regmap_update_bits(regmap, PLL_MODE(pll), PLL_FSM_LEGACY_MODE,
+							PLL_FSM_LEGACY_MODE);
+
 	regmap_update_bits(regmap, PLL_MODE(pll), PLL_UPDATE_BYPASS,
 							PLL_UPDATE_BYPASS);
 
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index 447efb82fe59..b15a62cb8e36 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -70,9 +70,10 @@ struct clk_alpha_pll {
 
 	const struct pll_vco *vco_table;
 	size_t num_vco;
-#define SUPPORTS_OFFLINE_REQ	BIT(0)
-#define SUPPORTS_FSM_MODE	BIT(2)
+#define SUPPORTS_OFFLINE_REQ		BIT(0)
+#define SUPPORTS_FSM_MODE		BIT(2)
 #define SUPPORTS_DYNAMIC_UPDATE	BIT(3)
+#define SUPPORTS_FSM_LEGACY_MODE	BIT(4)
 	u8 flags;
 
 	struct clk_regmap clkr;
-- 
2.37.0