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

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Message-ID: <CAGXv+5E2G-OBwQyKdMVavw5hTNQsNe7v=yHc720csxOchV9wpA@mail.gmail.com>
Date:   Mon, 23 Aug 2021 17:56:22 +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 Mon, Aug 23, 2021 at 5:21 PM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> 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)

I actually only requested the files related to DT bindings, which includes
`Documentation/device-tree/bindings/*` and `include/dt-bindings/*`, be dual
licensed.

I'm not sure dual licensing the actual driver code makes sense, or is
even valid, since this calls into existing GPL-2.0 code. But I am not
a lawyer.


ChenYu

> > +//
> > +// 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>
>
> [...]