linux-kernel - Re: [PATCH 4/5] arm64: dts: exynos5433: Add bus dt node using VDD

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Date:   Wed, 07 Dec 2016 20:17:48 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     javier@....samsung.com, kgene@...nel.org, robh+dt@...nel.org,
        s.nawrocki@...sung.com, tomasz.figa@...il.com,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] arm64: dts: exynos5433: Add bus dt node using VDD_INT
 for Exynos5433

On 2016년 12월 07일 04:21, Krzysztof Kozlowski wrote:
> On Fri, Dec 02, 2016 at 04:18:06PM +0900, Chanwoo Choi wrote:
>> This patch adds the bus nodes using VDD_INT for Exynos5433 SoC.
>> Exynos5433 has the following AMBA AXI buses to translate data
>> between DRAM and sub-blocks.
>>
>> Following list specify the detailed correlation between sub-block and clock:
>> - CLK_ACLK_G2D_{400|266}  : Bus clock for G2D
>> - CLK_ACLK_MSCL_400       : Bus clock for MSCL (Mobile Scaler)
>> - CLK_ACLK_GSCL_333       : Bus clock for GSCL (General Scaler)
>> - CLK_SCLK_JPEG_MSCL      : Bus clock for JPEG
>> - CLK_ACLK_MFC_400        : Bus clock for MFC (Multi Format Codec)
>> - CLK_ACLK_HEVC_400       : Bus clock for HEVC (High Effective Video Codec)
>> - CLK_ACLK_BUS0_400       : NoC(Network On Chip)'s bus clock for PERIC/PERIS/FSYS/MSCL
>> - CLK_ACLK_BUS1_400       : NoC's bus clock for MFC/HEVC/G3D
>> - CLK_ACLK_BUS2_400       : NoC's bus clock for GSCL/DISP/G2D/CAM0/CAM1/ISP
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>>  arch/arm64/boot/dts/exynos/exynos5433-bus.dtsi | 208 +++++++++++++++++++++++++
>>  arch/arm64/boot/dts/exynos/exynos5433.dtsi     |   1 +
>>  2 files changed, 209 insertions(+)
>>  create mode 100644 arch/arm64/boot/dts/exynos/exynos5433-bus.dtsi
>>
>> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-bus.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-bus.dtsi
>> new file mode 100644
>> index 000000000000..b1e1d9c622e1
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/exynos/exynos5433-bus.dtsi
>> @@ -0,0 +1,208 @@
>> +/*
>> + * Samsung's Exynos5433 SoC Memory interface and AMBA bus device tree source
>> + *
>> + * Copyright (c) 2016 Samsung Electronics Co., Ltd.
>> + * Chanwoo Choi <cw00.choi@...sung.com>
>> + *
>> + * Samsung's Exynos5433 SoC Memory interface and AMBA buses are listed
>> + * as device tree nodes are listed in this file.
> 
> This duplicates the introduction line and does not make sense.

I'll remove it.

> 
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +/ {
> 
> Shouldn't these be under soc node? It looks like property of SoC itself.

OK. Move to them under SoC.
- "/ {" -> "&soc {"

> 
>> +	/* INT (Internal) block using VDD_INT */
>> +	bus_g2d_400: bus_g2d_400 {
> 
> In node name, the dash '-' is preferred. The name should describe
> general class of device so probably this should be just "bus"... but I
> don't see a way how to do it reasonable anyway.

I'll change them as following with 'busX'.

The each dt node has the unique number('X')
because each dt node does not have the base address
and then need to identify oneself.

	bus_g2d_400: bus0 {
	bus_g2d_266: bus1 {
	bus_gscl: bus2 {
	bus_hevc: bus3 {
	bus_jpeg: bus4 {
	bus_mfc: bus5 {
	bus_mscl: bus6 {
	bus_noc0: bus7 {
	bus_noc1: bus8 {
	bus_noc2: bus9 {

> 
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_ACLK_G2D_400>;
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_g2d_400_opp_table>;
>> +		status ="disable";
> 
> Hm?

I'll fix it. disable -> disabled

> 
> 
>> +	};
>> +
>> +	bus_mscl: bus_mscl {
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_ACLK_MSCL_400>;
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_g2d_400_opp_table>;
>> +		status ="disable";
>> +	};
>> +
>> +	bus_jpeg: bus_jpeg {
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_SCLK_JPEG_MSCL>;
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_g2d_400_opp_table>;
>> +		status ="disable";
>> +	};
>> +
>> +	bus_mfc: bus_mfc {
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_ACLK_MFC_400>;
>> +
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_g2d_400_opp_table>;
>> +		status ="disable";
>> +	};
>> +
>> +	bus_g2d_266: bus_g2d_266 {
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_ACLK_G2D_266>;
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_g2d_266_opp_table>;
>> +		status ="disable";
>> +	};
>> +
>> +	bus_gscl: bus_gscl {
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_ACLK_GSCL_333>;
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_gscl_opp_table>;
>> +		status ="disable";
>> +	};
>> +
>> +	bus_hevc: bus_hevc {
>> +		compatible = "samsung,exynos-bus";
>> +		clocks = <&cmu_top CLK_ACLK_HEVC_400>;
>> +		clock-names = "bus";
>> +		operating-points-v2 = <&bus_hevc_opp_table>;
>> +		status ="disable";
>> +	};
>> +
>> +	bus_bus0: bus_bus0 {
> 
> bus, bus, bus, bus, jackpot! Let's try to find better name and label for
> these. :)

I'll change the name with 'noc' prefix because this bus is used
for NoC (Network On Chip)'s bus clock as commit msg.
- old : bus_bus0
- new : bus_noc0


Best Regards,
Chanwoo Choi