linux-kernel - [PATCH v3 4/5] clk: sunxi-ng: a64: Add constraints on PLL-MIPI's n/m ratio and parent rate

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Message-Id: <20240304-pinephone-pll-fixes-v3-4-94ab828f269a@oltmanns.dev>
Date: Mon, 04 Mar 2024 08:29:20 +0100
From: Frank Oltmanns <frank@...manns.dev>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Guido Günther <agx@...xcpu.org>, 
 Purism Kernel Team <kernel@...i.sm>, Ondrej Jirman <megi@....cz>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH v3 4/5] clk: sunxi-ng: a64: Add constraints on PLL-MIPI's
 n/m ratio and parent rate

The Allwinner A64 manual lists the following constraints for the
PLL-MIPI clock:
 - M/N <= 3
 - (PLL_VIDEO0)/M >= 24MHz

Use these constraints.

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Frank Oltmanns <frank@...manns.dev>
---
 drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
index 6a4b2b9ef30a..07796c79a23e 100644
--- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
+++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
@@ -171,11 +171,13 @@ static struct ccu_nkm pll_mipi_clk = {
 	 * user manual, and by experiments the PLL doesn't work without
 	 * these bits toggled.
 	 */
-	.enable		= BIT(31) | BIT(23) | BIT(22),
-	.lock		= BIT(28),
-	.n		= _SUNXI_CCU_MULT(8, 4),
-	.k		= _SUNXI_CCU_MULT_MIN(4, 2, 2),
-	.m		= _SUNXI_CCU_DIV(0, 4),
+	.enable			= BIT(31) | BIT(23) | BIT(22),
+	.lock			= BIT(28),
+	.n			= _SUNXI_CCU_MULT(8, 4),
+	.k			= _SUNXI_CCU_MULT_MIN(4, 2, 2),
+	.m			= _SUNXI_CCU_DIV(0, 4),
+	.max_m_n_ratio		= 3,
+	.min_parent_m_ratio	= 24000000,
 	.common		= {
 		.reg		= 0x040,
 		.hw.init	= CLK_HW_INIT("pll-mipi", "pll-video0",

-- 
2.44.0