RE: [Patch v3 01/15] dt-bindings: media: s5p-mfc: Add new DT schema for MFC

Aakarsh Jain
2022-10-28T05:55:13Z

> -----Original Message-----
> From: Alim Akhtar [mailto:alim.akhtar@samsung.com]
> Sent: 27 October 2022 16:10
> To: 'aakarsh jain' <aakarsh.jain@samsung.com>; linux-arm-
> kernel@lists.infradead.org; linux-media@vger.kernel.org; linux-
> kernel@vger.kernel.org; devicetree@vger.kernel.org
> Cc: m.szyprowski@samsung.com; andrzej.hajda@intel.com;
> mchehab@kernel.org; hverkuil-cisco@xs4all.nl;
> ezequiel@vanguardiasur.com.ar; jernej.skrabec@gmail.com;
> benjamin.gaignard@collabora.com; stanimir.varbanov@linaro.org;
> dillon.minfei@gmail.com; david.plowman@raspberrypi.com;
> mark.rutland@arm.com; robh+dt@kernel.org; krzk+dt@kernel.org;
> andi@etezian.org; aswani.reddy@samsung.com;
> pankaj.dubey@samsung.com; linux-fsd@tesla.com; smitha.t@samsung.com
> Subject: RE: [Patch v3 01/15] dt-bindings: media: s5p-mfc: Add new DT
> schema for MFC
>
> Hi Aakarsh
> Thanks for the patch.
>
> >-----Original Message-----
> >From: aakarsh jain [mailto:aakarsh.jain@samsung.com]
> >Sent: Tuesday, October 11, 2022 5:55 PM
> >To: linux-arm-kernel@lists.infradead.org; linux-media@vger.kernel.org;
> >linux- kernel@vger.kernel.org; devicetree@vger.kernel.org
> >Cc: m.szyprowski@samsung.com; andrzej.hajda@intel.com;
> >mchehab@kernel.org; hverkuil-cisco@xs4all.nl;
> >ezequiel@vanguardiasur.com.ar; jernej.skrabec@gmail.com;
> >benjamin.gaignard@collabora.com; stanimir.varbanov@linaro.org;
> >dillon.minfei@gmail.com; david.plowman@raspberrypi.com;
> >mark.rutland@arm.com; robh+dt@kernel.org; krzk+dt@kernel.org;
> >andi@etezian.org; alim.akhtar@samsung.com;
> aswani.reddy@samsung.com;
> >pankaj.dubey@samsung.com; linux-fsd@tesla.com;
> smitha.t@samsung.com;
> >aakarsh.jain@samsung.com
> >Subject: [Patch v3 01/15] dt-bindings: media: s5p-mfc: Add new DT
> >schema for MFC
> >
> >From: Smitha T Murthy <smitha.t@samsung.com>
> >
> >Convert DT schema for s5p-mfc in yaml format
> >
> >Cc: linux-fsd@tesla.com
> >Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
> >Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
> >---
> > .../devicetree/bindings/media/s5p-mfc.txt | 75 --------
> > .../bindings/media/samsung,s5p-mfc.yaml | 163 ++++++++++++++++++
> > 2 files changed, 163 insertions(+), 75 deletions(-) create mode
> >100644 Documentation/devicetree/bindings/media/samsung,s5p-mfc.yaml
> >
> >diff --git a/Documentation/devicetree/bindings/media/s5p-mfc.txt
> >b/Documentation/devicetree/bindings/media/s5p-mfc.txt
> >index aa54c8159d9f..8b137891791f 100644
> >--- a/Documentation/devicetree/bindings/media/s5p-mfc.txt
> >+++ b/Documentation/devicetree/bindings/media/s5p-mfc.txt
> >@@ -1,76 +1 @@
> >-* Samsung Multi Format Codec (MFC)
> >
> >-Multi Format Codec (MFC) is the IP present in Samsung SoCs which
> >-supports high resolution decoding and encoding functionalities.
> >-The MFC device driver is a v4l2 driver which can encode/decode -video
> >raw/elementary streams and has support for all popular -video codecs.
> >-
> >-Required properties:
> >- - compatible : value should be either one among the following
> >- (a) "samsung,mfc-v5" for MFC v5 present in Exynos4 SoCs
> >- (b) "samsung,mfc-v6" for MFC v6 present in Exynos5 SoCs
> >- (c) "samsung,mfc-v7" for MFC v7 present in Exynos5420 SoC
> >- (d) "samsung,mfc-v8" for MFC v8 present in Exynos5800 SoC
> >- (e) "samsung,exynos5433-mfc" for MFC v8 present in Exynos5433
> SoC
> >- (f) "samsung,mfc-v10" for MFC v10 present in Exynos7880 SoC
> >-
> >- - reg : Physical base address of the IP registers and length of memory
> >- mapped region.
> >-
> >- - interrupts : MFC interrupt number to the CPU.
> >- - clocks : from common clock binding: handle to mfc clock.
> >- - clock-names : from common clock binding: must contain "mfc",
> >- corresponding to entry in the clocks property.
> >-
> >-Optional properties:
> >- - power-domains : power-domain property defined with a phandle
> >- to respective power domain.
> >- - memory-region : from reserved memory binding: phandles to two
> >reserved
> >- memory regions, first is for "left" mfc memory bus interfaces,
> >- second if for the "right" mfc memory bus, used when no SYSMMU
> >- support is available; used only by MFC v5 present in Exynos4 SoCs
> >-
> >-Obsolete properties:
> >- - samsung,mfc-r, samsung,mfc-l : support removed, please use memory-
> >region
> >- property instead
> >-
> >-
> >-Example:
> >-SoC specific DT entry:
> >-
> >-mfc: codec@13400000 {
> >- compatible = "samsung,mfc-v5";
> >- reg = <0x13400000 0x10000>;
> >- interrupts = <0 94 0>;
> >- power-domains = <&pd_mfc>;
> >- clocks = <&clock 273>;
> >- clock-names = "mfc";
> >-};
> >-
> >-Reserved memory specific DT entry for given board (see reserved memory
> >binding -for more information):
> >-
> >-reserved-memory {
> >- #address-cells = <1>;
> >- #size-cells = <1>;
> >- ranges;
> >-
> >- mfc_left: region@51000000 {
> >- compatible = "shared-dma-pool";
> >- no-map;
> >- reg = <0x51000000 0x800000>;
> >- };
> >-
> >- mfc_right: region@43000000 {
> >- compatible = "shared-dma-pool";
> >- no-map;
> >- reg = <0x43000000 0x800000>;
> >- };
> >-};
> >-
> >-Board specific DT entry:
> >-
> >-codec@13400000 {
> >- memory-region = <&mfc_left>, <&mfc_right>;
> >-};
> >diff --git a/Documentation/devicetree/bindings/media/samsung,s5p-
> >mfc.yaml b/Documentation/devicetree/bindings/media/samsung,s5p-
> >mfc.yaml
> >new file mode 100644
> >index 000000000000..ad61b509846f
> >--- /dev/null
> >+++ b/Documentation/devicetree/bindings/media/samsung,s5p-mfc.yaml
> >@@ -0,0 +1,163 @@
> >+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause %YAML 1.2
> >+---
> >+$id: http://devicetree.org/schemas/media/samsung,s5p-mfc.yaml#
> >+$schema: http://devicetree.org/meta-schemas/core.yaml#
> >+
> >+title: Samsung Exynos Multi Format Codec (MFC)
> >+
> >+maintainers:
> >+ - Marek Szyprowski <m.szyprowski@samsung.com>
> >+ - Smitha T Murthy <smitha.t@samsung.com>
> >+ - Aakarsh Jain <aakarsh.jain@samsung.com>
> >+
> >+description:
> >+ Multi Format Codec (MFC) is the IP present in Samsung SoCs which
> >+ supports high resolution decoding and encoding functionalities.
> >+
> >+properties:
> >+ compatible:
> >+ enum:
> >+ - samsung,mfc-v5 # Exynos4
> >+ - samsung,mfc-v6 # Exynos5
> >+ - samsung,mfc-v7 # Exynos5420
> >+ - samsung,mfc-v8 # Exynos5800
> >+ - samsung,exynos5433-mfc # Exynos5433
> >+ - samsung,mfc-v10 # Exynos7880
> >+
> >+ reg:
> >+ maxItems: 1
> >+
> >+ clocks:
> >+ minItems: 1
> >+ maxItems: 3
> >+
> >+ clock-names:
> >+ minItems: 1
> >+ maxItems: 3
> >+
> >+ interrupts:
> >+ maxItems: 1
> >+
> >+ iommus:
> >+ maxItems: 2
> >+
> >+ iommu-names:
> >+ maxItems: 2
> >+
> >+ power-domains:
> >+ maxItems: 1
> >+
> >+ memory-region:
> >+ maxItems: 1
> >+
> >+required:
> >+ - compatible
> >+ - reg
> >+ - clocks
> >+ - clock-names
> >+ - interrupts
> >+
> >+allOf:
> >+ - if:
> >+ properties:
> >+ compatible:
> >+ contains:
> >+ enum:
> >+ - samsung,mfc-v6
> >+ - samsung,mfc-v7
> >+ - samsung,mfc-v8
> >+ - tesla,fsd-mfc
> You have not introduce "tesla,fsd-mfc" compatible yet, so this should be part
> of the patch which adds fsd-mfc compatible
>
ok.
> >+ then:
> >+ properties:
> >+ clocks:
> >+ maxItems: 1
> >+ clock-names:
> >+ items:
> >+ - const: mfc
> >+
> >+ - if:
> >+ properties:
> >+ compatible:
> >+ contains:
> >+ enum:
> >+ - samsung,mfc-v5
> >+ then:
> >+ properties:
> >+ clocks:
> >+ minItems: 2
> >+ maxItems: 2
> >+ clock-names:
> >+ items:
> >+ - const: mfc
> >+ - const: sclk_mfc
> >+
> >+ - if:
> >+ properties:
> >+ compatible:
> >+ contains:
> >+ enum:
> >+ - samsung,exynos5433-mfc
> >+ then:
> >+ properties:
> >+ clocks:
> >+ minItems: 3
> >+ maxItems: 3
> >+ clock-names:
> >+ items:
> >+ - const: pclk
> >+ - const: aclk
> >+ - const: aclk_xiu
> >+
> >+ - if:
> >+ properties:
> >+ compatible:
> >+ contains:
> >+ enum:
> >+ - samsung,mfc-v5
> >+ - samsung,mfc-v6
> >+ - samsung,mfc-v7
> >+ - samsung,mfc-v8
> >+ - samsung,exynos5433-mfc
> >+
> >+ then:
> >+ properties:
> >+ iommus:
> >+ minItems: 2
> >+ maxItems: 2
> >+ iommu-names:
> >+ items:
> >+ - const: left
> >+ - const: right
> >+
> >+ - if:
> >+ properties:
> >+ compatible:
> >+ contains:
> >+ enum:
> >+ - tesla,fsd-mfc
>
> Same comments as above.
>
> My suggestion, first just convert the current s5p-mfc.txt to yaml format and
> then add fsd-mfc support.
> That way it will be easy for reviewer to understand the changes.
>
> While reviewing and code walk through, I also noticed that exynos3250.dtsi
> and exynos5420.dtsi are using same compatible as "samsung,mfc-v7" but
> there "clocks" property is different. That doesn't look correct.
> This will cause issues when you convert s5p-mfc.txt to schema format.
> I don’t know why that was done that way, but surely this need to be _fixed_
> first as h/w itself are different.
>
> So my suggestion is to fix exynos3250.dtsi and exynos5420.dtsi compatible
> and mfc driver for it first (as a separate patch series).
> You can use the same approach what was done for mfc-v8 and mfc-v8-5433.
>
>
ok will fix this issue .

> >+ then:
> >+ properties:
> >+ memory-region:
> >+ maxItems: 1
> >+
> >+additionalProperties: false
> >+
> >+examples:
> >+ - |
> >+ #include <dt-bindings/clock/exynos4.h>
> >+ #include <dt-bindings/clock/exynos-audss-clk.h>
> >+ #include <dt-bindings/interrupt-controller/arm-gic.h>
> >+ #include <dt-bindings/interrupt-controller/irq.h>
> >+
> >+ codec@13400000 {
> >+ compatible = "samsung,mfc-v5";
> >+ reg = <0x13400000 0x10000>;
> >+ interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
> >+ power-domains = <&pd_mfc>;
> >+ clocks = <&clock CLK_MFC>, <&clock CLK_SCLK_MFC>;
> >+ clock-names = "mfc", "sclk_mfc";
> >+ iommus = <&sysmmu_mfc_l>, <&sysmmu_mfc_r>;
> >+ iommu-names = "left", "right";
> >+
> >+ };
> >--
> >2.17.1
>
>

Thanks for the review.