linux-kernel - Re: [PATCH v2 03/19] clk: mediatek: Add MT8188 topckgen clock support

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Message-ID: <875b601c-bc41-2d6b-2e93-4c98e3b6c371@collabora.com>
Date:   Thu, 27 Oct 2022 10:21:04 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     "Garmin.Chang" <Garmin.Chang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Richard Cochran <richardcochran@...il.com>
Cc:     Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 03/19] clk: mediatek: Add MT8188 topckgen clock support

Il 24/10/22 11:42, Garmin.Chang ha scritto:
> Add MT8188 topckgen clock controller which provides muxes, dividers
> to handle variety clock selection in other IP blocks.
> 
> Signed-off-by: Garmin.Chang <Garmin.Chang@...iatek.com>
> ---
>   drivers/clk/mediatek/Makefile              |    2 +-
>   drivers/clk/mediatek/clk-mt8188-topckgen.c | 1337 ++++++++++++++++++++
>   2 files changed, 1338 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/clk/mediatek/clk-mt8188-topckgen.c
> 
> diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
> index 957530b4303f..4fc7de25f036 100644
> --- a/drivers/clk/mediatek/Makefile
> +++ b/drivers/clk/mediatek/Makefile
> @@ -82,7 +82,7 @@ obj-$(CONFIG_COMMON_CLK_MT8186) += clk-mt8186-mcu.o clk-mt8186-topckgen.o clk-mt
>   				   clk-mt8186-mfg.o clk-mt8186-mm.o clk-mt8186-wpe.o \
>   				   clk-mt8186-img.o clk-mt8186-vdec.o clk-mt8186-venc.o \
>   				   clk-mt8186-cam.o clk-mt8186-mdp.o clk-mt8186-ipe.o
> -obj-$(CONFIG_COMMON_CLK_MT8188) += clk-mt8188-apmixedsys.o
> +obj-$(CONFIG_COMMON_CLK_MT8188) += clk-mt8188-apmixedsys.o clk-mt8188-topckgen.o
>   obj-$(CONFIG_COMMON_CLK_MT8192) += clk-mt8192.o
>   obj-$(CONFIG_COMMON_CLK_MT8192_AUDSYS) += clk-mt8192-aud.o
>   obj-$(CONFIG_COMMON_CLK_MT8192_CAMSYS) += clk-mt8192-cam.o
> diff --git a/drivers/clk/mediatek/clk-mt8188-topckgen.c b/drivers/clk/mediatek/clk-mt8188-topckgen.c
> new file mode 100644
> index 000000000000..c6ac6c2558ae
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-mt8188-topckgen.c
> @@ -0,0 +1,1337 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// Copyright (c) 2022 MediaTek Inc.
> +// Author: Garmin Chang <garmin.chang@...iatek.com>
> +
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <dt-bindings/clock/mediatek,mt8188-clk.h>
> +
> +#include "clk-gate.h"
> +#include "clk-mtk.h"
> +#include "clk-mux.h"
> +
> +static DEFINE_SPINLOCK(mt8188_clk_lock);
> +
> +static const struct mtk_fixed_clk top_fixed_clks[] = {
> +	FIXED_CLK(CLK_TOP_ULPOSC1, "ulposc_ck1", NULL, 260000000),
> +	FIXED_CLK(CLK_TOP_MPHONE_SLAVE_BCK, "mphone_slave_bck", NULL, 49152000),
> +	FIXED_CLK(CLK_TOP_PAD_FPC, "pad_fpc_ck", NULL, 50000000),
> +	FIXED_CLK(CLK_TOP_466M_FMEM, "hd_466m_fmem_ck", NULL, 533000000),
> +	FIXED_CLK(CLK_TOP_PEXTP_PIPE, "pextp_pipe", NULL, 250000000),
> +	FIXED_CLK(CLK_TOP_DSI_PHY, "dsi_phy", NULL, 500000000),
> +};
> +
> +static const struct mtk_fixed_factor top_divs[] = {
> +	FACTOR(CLK_TOP_MFGPLL, "mfgpll_ck", "mfgpll", 1, 1),
> +	FACTOR(CLK_TOP_MAINPLL, "mainpll_ck", "mainpll", 1, 1),

Are you sure that mainpll and univpll should have CLK_SET_RATE_PARENT?
This will give issues in GPU DVFS, as this is the case with all MediaTek SoCs.

Please check this series and add it as a dependency of yours:
https://patchwork.kernel.org/project/linux-mediatek/list/?series=688135

> +	FACTOR(CLK_TOP_MAINPLL_D3, "mainpll_d3", "mainpll_ck", 1, 3),
> +	FACTOR(CLK_TOP_MAINPLL_D4, "mainpll_d4", "mainpll_ck", 1, 4),

..snip..

> +
> +static struct mtk_composite top_muxes[] = {
> +	/* CLK_MISC_CFG_3 */
> +	MUX(CLK_TOP_MFG_CK_FAST_REF, "mfg_ck_fast_ref", mfg_fast_ref_parents, 0x0250, 8, 1),
> +};

CLK_TOP_MFG_CK_FAST_REF is not a composite clock: you can register it with a call
to devm_clk_hw_register_mux() in the probe function.

Check clk-mt8195-topckgen.c upstream for an example.

Regards,
Angelo