linux-kernel - Re: [v2 06/24] clk: mediatek: Add MT8195 apmixedsys clock support

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Date:   Mon, 23 Aug 2021 17:21:50 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Chun-Jie Chen <chun-jie.chen@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, linux-clk@...r.kernel.org,
        Devicetree List <devicetree@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [v2 06/24] clk: mediatek: Add MT8195 apmixedsys clock support

On Fri, Aug 20, 2021 at 7:20 PM Chun-Jie Chen
<chun-jie.chen@...iatek.com> wrote:
>
> Add MT8195 apmixedsys clock controller which provides Plls
> generated from SoC 26m and ssusb clock gate control.
>
> Signed-off-by: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> ---
>  drivers/clk/mediatek/Kconfig                 |   8 +
>  drivers/clk/mediatek/Makefile                |   1 +
>  drivers/clk/mediatek/clk-mt8195-apmixedsys.c | 145 +++++++++++++++++++
>  3 files changed, 154 insertions(+)
>  create mode 100644 drivers/clk/mediatek/clk-mt8195-apmixedsys.c
>
> diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
> index 576babd86f98..7ba1f4118e0d 100644
> --- a/drivers/clk/mediatek/Kconfig
> +++ b/drivers/clk/mediatek/Kconfig
> @@ -580,6 +580,14 @@ config COMMON_CLK_MT8192_VENCSYS
>         help
>           This driver supports MediaTek MT8192 vencsys clocks.
>
> +config COMMON_CLK_MT8195
> +        bool "Clock driver for MediaTek MT8195"
> +        depends on ARM64 || COMPILE_TEST
> +        select COMMON_CLK_MEDIATEK
> +        default ARM64
> +        help
> +          This driver supports MediaTek MT8195 basic clocks.

Since we will have all clocks under the same Kconfig option, please
drop the word "basic".

> +
>  config COMMON_CLK_MT8516
>         bool "Clock driver for MediaTek MT8516"
>         depends on ARCH_MEDIATEK || COMPILE_TEST
> diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
> index 15bc045f0b71..d4157cfca865 100644
> --- a/drivers/clk/mediatek/Makefile
> +++ b/drivers/clk/mediatek/Makefile
> @@ -80,5 +80,6 @@ obj-$(CONFIG_COMMON_CLK_MT8192_MSDC) += clk-mt8192-msdc.o
>  obj-$(CONFIG_COMMON_CLK_MT8192_SCP_ADSP) += clk-mt8192-scp_adsp.o
>  obj-$(CONFIG_COMMON_CLK_MT8192_VDECSYS) += clk-mt8192-vdec.o
>  obj-$(CONFIG_COMMON_CLK_MT8192_VENCSYS) += clk-mt8192-venc.o
> +obj-$(CONFIG_COMMON_CLK_MT8195) += clk-mt8195-apmixedsys.o
>  obj-$(CONFIG_COMMON_CLK_MT8516) += clk-mt8516.o
>  obj-$(CONFIG_COMMON_CLK_MT8516_AUDSYS) += clk-mt8516-aud.o
> diff --git a/drivers/clk/mediatek/clk-mt8195-apmixedsys.c b/drivers/clk/mediatek/clk-mt8195-apmixedsys.c
> new file mode 100644
> index 000000000000..253eb30b22d4
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-mt8195-apmixedsys.c
> @@ -0,0 +1,145 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +//
> +// Copyright (c) 2021 MediaTek Inc.
> +// Author: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> +
> +#include "clk-gate.h"
> +#include "clk-mtk.h"
> +
> +#include <dt-bindings/clock/mt8195-clk.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +
> +static const struct mtk_gate_regs apmixed_cg_regs = {
> +       .set_ofs = 0x8,
> +       .clr_ofs = 0x8,
> +       .sta_ofs = 0x8,
> +};
> +
> +#define GATE_APMIXED(_id, _name, _parent, _shift)                      \
> +       GATE_MTK(_id, _name, _parent, &apmixed_cg_regs, _shift, &mtk_clk_gate_ops_no_setclr_inv)
> +
> +static const struct mtk_gate apmixed_clks[] = {
> +       GATE_APMIXED(CLK_APMIXED_PLL_SSUSB26M, "pll_ssusb26m", "clk26m", 1),
> +};
> +
> +#define MT8195_PLL_FMAX                (3800UL * MHZ)
> +#define MT8195_PLL_FMIN                (1500UL * MHZ)
> +#define MT8195_INTEGER_BITS    8
> +
> +#define PLL(_id, _name, _reg, _pwr_reg, _en_mask, _flags,              \
> +                       _rst_bar_mask, _pcwbits, _pd_reg, _pd_shift,    \
> +                       _tuner_reg, _tuner_en_reg, _tuner_en_bit,       \
> +                       _pcw_reg, _pcw_shift, _pcw_chg_reg,             \
> +                       _en_reg, _pll_en_bit) {                         \

Nit: Even for macro definitions, you could align the lines to the opening
parenthesis. That would give you more room. And it would make it slightly
easier to read.

Otherwise,

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>

[...]