linux-kernel - [PATCH v6 4/5] clk: mediatek: add pcw_chg

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Date: Sat, 16 Dec 2023 00:23:14 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Daniel Golle <daniel@...rotopia.org>,
	Chen-Yu Tsai <wenst@...omium.org>,
	"Garmin.Chang" <Garmin.Chang@...iatek.com>,
	Sam Shih <sam.shih@...iatek.com>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	James Liao <jamesjj.liao@...iatek.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: [PATCH v6 4/5] clk: mediatek: add pcw_chg_bit control for PLLs of
 MT7988

From: Sam Shih <sam.shih@...iatek.com>

Introduce pcw_chg_bit member to struct mtk_pll_data and use it instead
of the previously hardcoded PCW_CHG_MASK macro if set.
This will needed for clocks on the MT7988 SoC.

Signed-off-by: Sam Shih <sam.shih@...iatek.com>
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
v6: no changes
v5: rename to .pcw_chg_bit, use ? operator instead of changing every
    single existing driver. The approach in v4 doesn't work as
    if .pcw_chg_reg is unset/0, pll->pcw_chg_addr will default to
    pll->base_addr + REG_CON1. Hence setting .pcw_chg_bit would be
    required for *all* drivers instead of just those setting
    .pcs_chf_reg. And that seems like an excessive change which can
    easily be avoided by using the ? operator to set the default
    at runtime (and we can easily cope with that overhead).
v4: always set .pcw_chg_shift if .pcw_chg_reg is used instead of
    having an if-expression in mtk_pll_set_rate_regs().
v3: use git --from ...
v2: no changes
 drivers/clk/mediatek/clk-pll.c | 5 +++--
 drivers/clk/mediatek/clk-pll.h | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index 513ab6b1b3229..ce453e1718e53 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -23,7 +23,7 @@
 #define CON0_BASE_EN		BIT(0)
 #define CON0_PWR_ON		BIT(0)
 #define CON0_ISO_EN		BIT(1)
-#define PCW_CHG_MASK		BIT(31)
+#define PCW_CHG_BIT		31
 
 #define AUDPLL_TUNER_EN		BIT(31)
 
@@ -114,7 +114,8 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
 			pll->data->pcw_shift);
 	val |= pcw << pll->data->pcw_shift;
 	writel(val, pll->pcw_addr);
-	chg = readl(pll->pcw_chg_addr) | PCW_CHG_MASK;
+	chg = readl(pll->pcw_chg_addr) |
+	      BIT(pll->data->pcw_chg_bit ? : PCW_CHG_BIT);
 	writel(chg, pll->pcw_chg_addr);
 	if (pll->tuner_addr)
 		writel(val + 1, pll->tuner_addr);
diff --git a/drivers/clk/mediatek/clk-pll.h b/drivers/clk/mediatek/clk-pll.h
index f17278ff15d78..285c8db958b39 100644
--- a/drivers/clk/mediatek/clk-pll.h
+++ b/drivers/clk/mediatek/clk-pll.h
@@ -48,6 +48,7 @@ struct mtk_pll_data {
 	const char *parent_name;
 	u32 en_reg;
 	u8 pll_en_bit; /* Assume 0, indicates BIT(0) by default */
+	u8 pcw_chg_bit;
 };
 
 /*
-- 
2.43.0