linux-kernel - [PATCH 2/5] clk: sunxi-ng: a64: Add constraints on PLL-MIPI's n/m ratio and parent rate

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Date: Mon, 18 Dec 2023 14:35:20 +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>
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, Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH 2/5] 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.

Signed-off-by: Frank Oltmanns <frank@...manns.dev>
---
 drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
index 8951ffc14ff5..c034ac027d1c 100644
--- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
+++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
@@ -176,6 +176,8 @@ static struct ccu_nkm pll_mipi_clk = {
 	.n		= _SUNXI_CCU_MULT(8, 4),
 	.k		= _SUNXI_CCU_MULT_MIN(4, 2, 2),
 	.m		= _SUNXI_CCU_DIV(0, 4),
+	.max_mn_ratio	= 3,
+	.parent_wo_nk	= 24000000,
 	.common		= {
 		.reg		= 0x040,
 		.hw.init	= CLK_HW_INIT("pll-mipi", "pll-video0",

-- 
2.43.0