linux-kernel - Re: [PATCH v6 07/19] clk: mediatek: Add MT8188 ccusys clock support

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Date:   Tue, 14 Mar 2023 10:05:08 +0100
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,
        linux-clk@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v6 07/19] clk: mediatek: Add MT8188 ccusys clock support

Il 09/03/23 14:54, Garmin.Chang ha scritto:
> Add MT8188 ccusys clock controller which provides clock gate
> control in Camera Computing Unit.
> 
> Signed-off-by: Garmin.Chang <Garmin.Chang@...iatek.com>
> ---
>   drivers/clk/mediatek/Makefile         |  2 +-
>   drivers/clk/mediatek/clk-mt8188-ccu.c | 48 +++++++++++++++++++++++++++
>   2 files changed, 49 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/clk/mediatek/clk-mt8188-ccu.c
> 
> diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
> index a4189d28cecc..fb66d25e98fd 100644
> --- a/drivers/clk/mediatek/Makefile
> +++ b/drivers/clk/mediatek/Makefile
> @@ -93,7 +93,7 @@ obj-$(CONFIG_COMMON_CLK_MT8186) += clk-mt8186-mcu.o clk-mt8186-topckgen.o clk-mt
>   				   clk-mt8186-cam.o clk-mt8186-mdp.o clk-mt8186-ipe.o
>   obj-$(CONFIG_COMMON_CLK_MT8188) += clk-mt8188-apmixedsys.o clk-mt8188-topckgen.o \
>   				   clk-mt8188-peri_ao.o clk-mt8188-infra_ao.o \
> -				   clk-mt8188-cam.o
> +				   clk-mt8188-cam.o clk-mt8188-ccu.o

clk-mt8188-cam and clk-mt8188-ccu can go under a different configuration option
for modularity.

For example...

obj-$(CONFIG_COMMON_CLK_MT8188_CAM) +=  ...ccu.o, ...cam.o

Please make sure, for boot performance purposes, to order them as:

obj-$(CONFIG_.....) += driver-clk1.o driver-requiring-clk1-clocks.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-ccu.c b/drivers/clk/mediatek/clk-mt8188-ccu.c
> new file mode 100644
> index 000000000000..b7380060f906
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-mt8188-ccu.c
> @@ -0,0 +1,48 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// Copyright (c) 2022 MediaTek Inc.
> +// Author: Garmin Chang <garmin.chang@...iatek.com>
> +
> +#include <linux/clk-provider.h>
> +#include <linux/platform_device.h>
> +#include <dt-bindings/clock/mediatek,mt8188-clk.h>
> +
> +#include "clk-gate.h"
> +#include "clk-mtk.h"
> +
> +static const struct mtk_gate_regs ccu_cg_regs = {
> +	.set_ofs = 0x4,
> +	.clr_ofs = 0x8,
> +	.sta_ofs = 0x0,
> +};
> +
> +#define GATE_CCU(_id, _name, _parent, _shift)			\
> +	GATE_MTK(_id, _name, _parent, &ccu_cg_regs, _shift, &mtk_clk_gate_ops_setclr)
> +
> +static const struct mtk_gate ccu_clks[] = {
> +	GATE_CCU(CLK_CCU_LARB27, "ccu_larb27", "top_ccu", 0),
> +	GATE_CCU(CLK_CCU_AHB, "ccu_ahb", "top_ccu", 1),
> +	GATE_CCU(CLK_CCU_CCU0, "ccu_ccu0", "top_ccu", 2),
> +};
> +
> +static const struct mtk_clk_desc ccu_desc = {
> +	.clks = ccu_clks,
> +	.num_clks = ARRAY_SIZE(ccu_clks),
> +};
> +
> +static const struct of_device_id of_match_clk_mt8188_ccu[] = {
> +	{ .compatible = "mediatek,mt8188-ccusys", .data = &ccu_desc},

Missing space: { [...] &ccu_desc },

> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver clk_mt8188_ccu_drv = {
> +	.probe = mtk_clk_simple_probe,
> +	.remove = mtk_clk_simple_remove,
> +	.driver = {
> +		.name = "clk-mt8188-ccu",
> +		.of_match_table = of_match_clk_mt8188_ccu,
> +	},
> +};
> +
> +builtin_platform_driver(clk_mt8188_ccu_drv);

module_platform_driver

> +MODULE_LICENSE("GPL");