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

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Date: Tue, 19 Dec 2023 17:46:59 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
 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>,
 Frank Oltmanns <frank@...manns.dev>
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:
 Re: [PATCH 2/5] clk: sunxi-ng: a64: Add constraints on PLL-MIPI's n/m ratio
 and parent rate

Dne ponedeljek, 18. december 2023 ob 14:35:20 CET je Frank Oltmanns napisal(a):
> The Allwinner A64 manual lists the following constraints for the
> PLL-MIPI clock:
>  - M/N >= 3

Same as in previous patch, should be "<=".

Best regards,
Jernej

>  - (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",
> 
>