Re: [v2 19/24] clk: mediatek: Add MT8195 vencsys clock support

[Chun-Jie Chen]

On Wed, 2021-08-25 at 19:03 +0800, Chen-Yu Tsai wrote:
> On Fri, Aug 20, 2021 at 7:31 PM Chun-Jie Chen
> <chun-jie.chen@xxxxxxxxxxxx> wrote:
> > 
> > Add MT8195 vencsys clock controller which provide clock gate
> > control for video encoder.
> > 
> > Signed-off-by: Chun-Jie Chen <chun-jie.chen@xxxxxxxxxxxx>
> > ---
> >  drivers/clk/mediatek/Makefile          |  2 +-
> >  drivers/clk/mediatek/clk-mt8195-venc.c | 69
> > ++++++++++++++++++++++++++
> >  2 files changed, 70 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/clk/mediatek/clk-mt8195-venc.c
> > 
> > diff --git a/drivers/clk/mediatek/Makefile
> > b/drivers/clk/mediatek/Makefile
> > index 3c8c8cdbd3ef..82ffcc4f2c52 100644
> > --- a/drivers/clk/mediatek/Makefile
> > +++ b/drivers/clk/mediatek/Makefile
> > @@ -82,6 +82,6 @@ obj-$(CONFIG_COMMON_CLK_MT8192_VDECSYS) += clk-
> > mt8192-vdec.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192_VENCSYS) += clk-mt8192-venc.o
> >  obj-$(CONFIG_COMMON_CLK_MT8195) += clk-mt8195-apmixedsys.o clk-
> > mt8195-topckgen.o clk-mt8195-peri_ao.o clk-mt8195-infra_ao.o clk-
> > mt8195-cam.o \
> >                                         clk-mt8195-ccu.o clk-
> > mt8195-img.o clk-mt8195-ipe.o clk-mt8195-mfg.o clk-mt8195-
> > scp_adsp.o \
> > -                                       clk-mt8195-vdec.o clk-
> > mt8195-vdo0.o clk-mt8195-vdo1.o
> > +                                       clk-mt8195-vdec.o clk-
> > mt8195-vdo0.o clk-mt8195-vdo1.o clk-mt8195-venc.o
> >  obj-$(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-venc.c
> > b/drivers/clk/mediatek/clk-mt8195-venc.c
> > new file mode 100644
> > index 000000000000..10702a4ad5ff
> > --- /dev/null
> > +++ b/drivers/clk/mediatek/clk-mt8195-venc.c
> > @@ -0,0 +1,69 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +//
> > +// Copyright (c) 2021 MediaTek Inc.
> > +// Author: Chun-Jie Chen <chun-jie.chen@xxxxxxxxxxxx>
> > +
> > +#include "clk-gate.h"
> > +#include "clk-mtk.h"
> > +
> > +#include <dt-bindings/clock/mt8195-clk.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/platform_device.h>
> > +
> > +static const struct mtk_gate_regs venc_cg_regs = {
> > +       .set_ofs = 0x4,
> > +       .clr_ofs = 0x8,
> > +       .sta_ofs = 0x0,
> > +};
> > +
> > +#define GATE_VENC(_id, _name, _parent, _shift)                 \
> > +       GATE_MTK(_id, _name, _parent, &venc_cg_regs, _shift,
> > &mtk_clk_gate_ops_setclr_inv)
> > +
> > +static const struct mtk_gate venc_clks[] = {
> > +       GATE_VENC(CLK_VENC_LARB, "venc_larb", "top_venc", 0),
> > +       GATE_VENC(CLK_VENC_VENC, "venc_venc", "top_venc", 4),
> > +       GATE_VENC(CLK_VENC_JPGENC, "venc_jpgenc", "top_venc", 8),
> > +       GATE_VENC(CLK_VENC_JPGDEC, "venc_jpgdec", "top_venc", 12),
> > +       GATE_VENC(CLK_VENC_JPGDEC_C1, "venc_jpgdec_c1", "top_venc",
> > 16),
> > +       GATE_VENC(CLK_VENC_GALS, "venc_gals", "top_venc", 28),
> > +};
> > +
> > +static const struct mtk_gate venc_core1_clks[] = {
> > +       GATE_VENC(CLK_VENC_CORE1_LARB, "venc_core1_larb",
> > "top_venc", 0),
> > +       GATE_VENC(CLK_VENC_CORE1_VENC, "venc_core1_venc",
> > "top_venc", 4),
> > +       GATE_VENC(CLK_VENC_CORE1_JPGENC, "venc_core1_jpgenc",
> > "top_venc", 8),
> > +       GATE_VENC(CLK_VENC_CORE1_JPGDEC, "venc_core1_jpgdec",
> > "top_venc", 12),
> > +       GATE_VENC(CLK_VENC_CORE1_JPGDEC_C1, "venc_core1_jpgdec_c1",
> > "top_venc", 16),
> > +       GATE_VENC(CLK_VENC_CORE1_GALS, "venc_core1_gals",
> > "top_venc", 28),
> 
> The two hardware blocks look the same. Are there any actual
> differences?

These two hardware blocks are same, like venc core0 and core1.
Based on performance requirement we can choose to run one core or two
cores.

Thanks!
Best Regards,
Chun-Jie

> I am somewhat skeptical about using different compatible strings just
> to provide different clock names. This is normally handled with
> "clock-output-names" properties in the device tree.
> 
> ChenYu
> 
> > +};
> > +
> > +static const struct mtk_clk_desc venc_desc = {
> > +       .clks = venc_clks,
> > +       .num_clks = ARRAY_SIZE(venc_clks),
> > +};
> > +
> > +static const struct mtk_clk_desc venc_core1_desc = {
> > +       .clks = venc_core1_clks,
> > +       .num_clks = ARRAY_SIZE(venc_core1_clks),
> > +};
> > +
> > +static const struct of_device_id of_match_clk_mt8195_venc[] = {
> > +       {
> > +               .compatible = "mediatek,mt8195-vencsys",
> > +               .data = &venc_desc,
> > +       }, {
> > +               .compatible = "mediatek,mt8195-vencsys_core1",
> > +               .data = &venc_core1_desc,
> > +       }, {
> > +               /* sentinel */
> > +       }
> > +};
> > +
> > +static struct platform_driver clk_mt8195_venc_drv = {
> > +       .probe = mtk_clk_simple_probe,
> > +       .driver = {
> > +               .name = "clk-mt8195-venc",
> > +               .of_match_table = of_match_clk_mt8195_venc,
> > +       },
> > +};
> > +builtin_platform_driver(clk_mt8195_venc_drv);
> > --
> > 2.18.0
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