Re: [v2 22/24] clk: mediatek: Add MT8195 wpesys clock support

[Chun-Jie Chen <chun-jie.chen@mediatek.com>]

On Wed, 2021-08-25 at 19:34 +0800, Chen-Yu Tsai wrote:
> On Fri, Aug 20, 2021 at 7:33 PM Chun-Jie Chen
> <chun-jie.chen@mediatek.com> wrote:
> > 
> > Add MT8195 wpesys clock controllers which provide clock gate
> > control in Wrapping Engine.
> > 
> > Signed-off-by: Chun-Jie Chen <chun-jie.chen@mediatek.com>
> > ---
> >  drivers/clk/mediatek/Makefile         |   2 +-
> >  drivers/clk/mediatek/clk-mt8195-wpe.c | 143
> > ++++++++++++++++++++++++++
> >  2 files changed, 144 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/clk/mediatek/clk-mt8195-wpe.c
> > 
> > diff --git a/drivers/clk/mediatek/Makefile
> > b/drivers/clk/mediatek/Makefile
> > index 402a809ff6ac..dfe7047c6795 100644
> > --- a/drivers/clk/mediatek/Makefile
> > +++ b/drivers/clk/mediatek/Makefile
> > @@ -83,6 +83,6 @@ 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-venc.o clk-mt8195-vpp0.o 
> > \
> > -                                       clk-mt8195-vpp1.o
> > +                                       clk-mt8195-vpp1.o clk-
> > mt8195-wpe.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-wpe.c
> > b/drivers/clk/mediatek/clk-mt8195-wpe.c
> > new file mode 100644
> > index 000000000000..7e92a3cab497
> > --- /dev/null
> > +++ b/drivers/clk/mediatek/clk-mt8195-wpe.c
> > @@ -0,0 +1,143 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +//
> > +// Copyright (c) 2021 MediaTek Inc.
> > +// Author: Chun-Jie Chen <chun-jie.chen@mediatek.com>
> > +
> > +#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 wpe_cg_regs = {
> > +       .set_ofs = 0x0,
> > +       .clr_ofs = 0x0,
> > +       .sta_ofs = 0x0,
> > +};
> > +
> > +static const struct mtk_gate_regs wpe_vpp0_cg_regs = {
> > +       .set_ofs = 0x58,
> > +       .clr_ofs = 0x58,
> > +       .sta_ofs = 0x58,
> > +};
> > +
> > +static const struct mtk_gate_regs wpe_vpp1_cg_regs = {
> > +       .set_ofs = 0x5c,
> > +       .clr_ofs = 0x5c,
> > +       .sta_ofs = 0x5c,
> > +};
> > +
> > +#define GATE_WPE(_id, _name, _parent, _shift)                  \
> > +       GATE_MTK(_id, _name, _parent, &wpe_cg_regs, _shift,
> > &mtk_clk_gate_ops_no_setclr_inv)
> > +
> > +#define GATE_WPE_VPP0(_id, _name, _parent,
> > _shift)                     \
> > +       GATE_MTK(_id, _name, _parent, &wpe_vpp0_cg_regs, _shift,
> > &mtk_clk_gate_ops_no_setclr_inv)
> > +
> > +#define GATE_WPE_VPP1(_id, _name, _parent,
> > _shift)                     \
> > +       GATE_MTK(_id, _name, _parent, &wpe_vpp1_cg_regs, _shift,
> > &mtk_clk_gate_ops_no_setclr_inv)
> > +
> > +static const struct mtk_gate wpe_clks[] = {
> > +       GATE_WPE(CLK_WPE_VPP0, "wpe_vpp0", "top_wpe_vpp", 16),
> > +       GATE_WPE(CLK_WPE_VPP1, "wpe_vpp1", "top_wpe_vpp", 17),
> > +       GATE_WPE(CLK_WPE_SMI_LARB7, "wpe_smi_larb7", "top_wpe_vpp",
> > 18),
> > +       GATE_WPE(CLK_WPE_SMI_LARB8, "wpe_smi_larb8", "top_wpe_vpp",
> > 19),
> > +       GATE_WPE(CLK_WPE_EVENT_TX, "wpe_event_tx", "top_wpe_vpp",
> > 20),
> > +       GATE_WPE(CLK_WPE_SMI_LARB7_P, "wpe_smi_larb7_p",
> > "top_wpe_vpp", 24),
> > +       GATE_WPE(CLK_WPE_SMI_LARB8_P, "wpe_smi_larb8_p",
> > "top_wpe_vpp", 25),
> > +};
> > +
> > +static const struct mtk_gate wpe_vpp0_clks[] = {
> > +       /* WPE_VPP0 */
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_VGEN, "wpe_vpp0_vgen",
> > "top_img", 0),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_EXT, "wpe_vpp0_ext", "top_img",
> > 1),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_VFC, "wpe_vpp0_vfc", "top_img",
> > 2),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH0_TOP, "wpe_vpp0_cach0_top",
> > "top_img", 3),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH0_DMA, "wpe_vpp0_cach0_dma",
> > "top_img", 4),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH1_TOP, "wpe_vpp0_cach1_top",
> > "top_img", 5),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH1_DMA, "wpe_vpp0_cach1_dma",
> > "top_img", 6),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH2_TOP, "wpe_vpp0_cach2_top",
> > "top_img", 7),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH2_DMA, "wpe_vpp0_cach2_dma",
> > "top_img", 8),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH3_TOP, "wpe_vpp0_cach3_top",
> > "top_img", 9),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_CACH3_DMA, "wpe_vpp0_cach3_dma",
> > "top_img", 10),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_PSP, "wpe_vpp0_psp", "top_img",
> > 11),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_PSP2, "wpe_vpp0_psp2",
> > "top_img", 12),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_SYNC, "wpe_vpp0_sync",
> > "top_img", 13),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_C24, "wpe_vpp0_c24", "top_img",
> > 14),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_MDP_CROP, "wpe_vpp0_mdp_crop",
> > "top_img", 15),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_ISP_CROP, "wpe_vpp0_isp_crop",
> > "top_img", 16),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP0_TOP, "wpe_vpp0_top", "top_img",
> > 17),
> > +       /* WPE_VPP1 */
> > +       GATE_WPE_VPP1(CLK_WPE_VPP0_VECI, "wpe_vpp0_veci",
> > "top_img", 0),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP0_VEC2I, "wpe_vpp0_vec2i",
> > "top_img", 1),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP0_VEC3I, "wpe_vpp0_vec3i",
> > "top_img", 2),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP0_WPEO, "wpe_vpp0_wpeo",
> > "top_img", 3),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP0_MSKO, "wpe_vpp0_msko",
> > "top_img", 4),
> > +};
> > +
> > +static const struct mtk_gate wpe_vpp1_clks[] = {
> > +       /* WPE_VPP0 */
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_VGEN, "wpe_vpp1_vgen",
> > "top_img", 0),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_EXT, "wpe_vpp1_ext", "top_img",
> > 1),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_VFC, "wpe_vpp1_vfc", "top_img",
> > 2),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH0_TOP, "wpe_vpp1_cach0_top",
> > "top_img", 3),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH0_DMA, "wpe_vpp1_cach0_dma",
> > "top_img", 4),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH1_TOP, "wpe_vpp1_cach1_top",
> > "top_img", 5),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH1_DMA, "wpe_vpp1_cach1_dma",
> > "top_img", 6),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH2_TOP, "wpe_vpp1_cach2_top",
> > "top_img", 7),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH2_DMA, "wpe_vpp1_cach2_dma",
> > "top_img", 8),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH3_TOP, "wpe_vpp1_cach3_top",
> > "top_img", 9),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_CACH3_DMA, "wpe_vpp1_cach3_dma",
> > "top_img", 10),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_PSP, "wpe_vpp1_psp", "top_img",
> > 11),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_PSP2, "wpe_vpp1_psp2",
> > "top_img", 12),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_SYNC, "wpe_vpp1_sync",
> > "top_img", 13),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_C24, "wpe_vpp1_c24", "top_img",
> > 14),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_MDP_CROP, "wpe_vpp1_mdp_crop",
> > "top_img", 15),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_ISP_CROP, "wpe_vpp1_isp_crop",
> > "top_img", 16),
> > +       GATE_WPE_VPP0(CLK_WPE_VPP1_TOP, "wpe_vpp1_top", "top_img",
> > 17),
> > +       /* WPE_VPP1 */
> > +       GATE_WPE_VPP1(CLK_WPE_VPP1_VECI, "wpe_vpp1_veci",
> > "top_img", 0),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP1_VEC2I, "wpe_vpp1_vec2i",
> > "top_img", 1),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP1_VEC3I, "wpe_vpp1_vec3i",
> > "top_img", 2),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP1_WPEO, "wpe_vpp1_wpeo",
> > "top_img", 3),
> > +       GATE_WPE_VPP1(CLK_WPE_VPP1_MSKO, "wpe_vpp1_msko",
> > "top_img", 4),
> 
> (Reply to correct patch revision...)
> 
> Same comment as vencsys patch: wpesys_vpp0 and wpesys_vpp1 look the
> same.
> Are they identical hardware blocks? Are different compatible strings
> really needed?
> 

wpesys_vpp0 and wpesys_vpp1 are two HW blocks with similar usage,
usually one for vpp0, one for vpp1. But they are still different HW
blocks so use two device nodes to present.

> I suggest adding clock-output-names to the device tree, and patching
> mtk_clk_register_gates_with_dev() to try to get a clock name from the
> device tree, and falling back to the predefined name in the list.
> Something like:
> 
> <---------------
> diff --git a/drivers/clk/mediatek/clk-mtk.c
> b/drivers/clk/mediatek/clk-mtk.c
> index 74890759e98c..71e856c22960 100644
> --- a/drivers/clk/mediatek/clk-mtk.c
> +++ b/drivers/clk/mediatek/clk-mtk.c
> @@ -125,11 +125,15 @@ int mtk_clk_register_gates_with_dev(struct
> device_node *node,
> 
>         for (i = 0; i < num; i++) {
>                 const struct mtk_gate *gate = &clks[i];
> +               const char *name = gate->name;
> 
>                 if (!IS_ERR_OR_NULL(clk_data->clks[gate->id]))
>                         continue;
> 
> -               clk = mtk_clk_register_gate(gate->name, gate-
> >parent_name,
> +               of_property_read_string(node, "clock-output-names",
> gate->id,
> +                                       &name);
> +
> +               clk = mtk_clk_register_gate(name, gate->parent_name,
>                                 regmap,
>                                 gate->regs->set_ofs,
>                                 gate->regs->clr_ofs,
> <---------------
> (tabs replaced with spaces, do not apply directly)
> 
> 
> ChenYu
> 
> 

Do you means describe the clock gate data in device tree like below

GATE_WPE_VPP0(CLK_WPE_VPP1_VGEN, "wpe_vpp1_vgen", "top_img", 0),
GATE_WPE_VPP0(CLK_WPE_VPP1_EXT, "wpe_vpp1_ext", "top_img", 1),

=>
clocks = <&topckgen CLK_TOP_IMG>,
	 <&topckgen CLK_TOP_IMG>,
	 ...

clock-output-names = "wpe_vpp1_vgen",
		     "wpe_vpp1_ext",
		     ...

Because many clock gate provided by different HW blocks,
I think is more easier to see the relation if we represent the clock
gate data in one line.

Thanks!
Best Regards,
Chun-Jie

> > +};
> > +
> > +static const struct mtk_clk_desc wpe_desc = {
> > +       .clks = wpe_clks,
> > +       .num_clks = ARRAY_SIZE(wpe_clks),
> > +};
> > +
> > +static const struct mtk_clk_desc wpe_vpp0_desc = {
> > +       .clks = wpe_vpp0_clks,
> > +       .num_clks = ARRAY_SIZE(wpe_vpp0_clks),
> > +};
> > +
> > +static const struct mtk_clk_desc wpe_vpp1_desc = {
> > +       .clks = wpe_vpp1_clks,
> > +       .num_clks = ARRAY_SIZE(wpe_vpp1_clks),
> > +};
> > +
> > +static const struct of_device_id of_match_clk_mt8195_wpe[] = {
> > +       {
> > +               .compatible = "mediatek,mt8195-wpesys",
> > +               .data = &wpe_desc,
> > +       }, {
> > +               .compatible = "mediatek,mt8195-wpesys_vpp0",
> > +               .data = &wpe_vpp0_desc,
> > +       }, {
> > +               .compatible = "mediatek,mt8195-wpesys_vpp1",
> > +               .data = &wpe_vpp1_desc,
> > +       }, {
> > +               /* sentinel */
> > +       }
> > +};
> > +
> > +static struct platform_driver clk_mt8195_wpe_drv = {
> > +       .probe = mtk_clk_simple_probe,
> > +       .driver = {
> > +               .name = "clk-mt8195-wpe",
> > +               .of_match_table = of_match_clk_mt8195_wpe,
> > +       },
> > +};
> > +builtin_platform_driver(clk_mt8195_wpe_drv);
> > --
> > 2.18.0
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