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dt-bindings: interconnect: samsung,exynos-bus: convert to dtschema

Browse Source 
Convert the Samsung Exynos SoC Bus and Interconnect bindings to DT
schema.

Vast parts of descritpion and example were copied, so keep license as
GPL-2.0-only.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Krzysztof Kozlowski 2022-06-26 14:52:38 +02:00 committed by Chanwoo Choi
parent 86d231b1db
commit e7fd2e6b97
3 changed files with 291 additions and 489 deletions
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488
Documentation/devicetree/bindings/devfreq/exynos-bus.txt
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@ -1,488 +0,0 @@
* Generic Exynos Bus frequency device
The Samsung Exynos SoC has many buses for data transfer between DRAM
and sub-blocks in SoC. Most Exynos SoCs share the common architecture
for buses. Generally, each bus of Exynos SoC includes a source clock
and a power line, which are able to change the clock frequency
of the bus in runtime. To monitor the usage of each bus in runtime,
the driver uses the PPMU (Platform Performance Monitoring Unit), which
is able to measure the current load of sub-blocks.
The Exynos SoC includes the various sub-blocks which have the each AXI bus.
The each AXI bus has the owned source clock but, has not the only owned
power line. The power line might be shared among one more sub-blocks.
So, we can divide into two type of device as the role of each sub-block.
There are two type of bus devices as following:
- parent bus device
- passive bus device
Basically, parent and passive bus device share the same power line.
The parent bus device can only change the voltage of shared power line
and the rest bus devices (passive bus device) depend on the decision of
the parent bus device. If there are three blocks which share the VDD_xxx
power line, Only one block should be parent device and then the rest blocks
should depend on the parent device as passive device.
VDD_xxx |--- A block (parent)
|--- B block (passive)
|--- C block (passive)
There are a little different composition among Exynos SoC because each Exynos
SoC has different sub-blocks. Therefore, such difference should be specified
in devicetree file instead of each device driver. In result, this driver
is able to support the bus frequency for all Exynos SoCs.
Required properties for all bus devices:
- compatible: Should be "samsung,exynos-bus".
- clock-names : the name of clock used by the bus, "bus".
- clocks : phandles for clock specified in "clock-names" property.
- operating-points-v2: the OPP table including frequency/voltage information
to support DVFS (Dynamic Voltage/Frequency Scaling) feature.
Required properties only for parent bus device:
- vdd-supply: the regulator to provide the buses with the voltage.
- devfreq-events: the devfreq-event device to monitor the current utilization
of buses.
Required properties only for passive bus device:
- devfreq: the parent bus device.
Optional properties only for parent bus device:
- exynos,saturation-ratio: the percentage value which is used to calibrate
the performance count against total cycle count.
Optional properties for the interconnect functionality (QoS frequency
constraints):
- #interconnect-cells: should be 0.
- interconnects: as documented in ../interconnect.txt, describes a path at the
higher level interconnects used by this interconnect provider.
If this interconnect provider is directly linked to a top level interconnect
provider the property contains only one phandle. The provider extends
the interconnect graph by linking its node to a node registered by provider
pointed to by first phandle in the 'interconnects' property.
- samsung,data-clock-ratio: ratio of the data throughput in B/s to minimum data
clock frequency in Hz, default value is 8 when this property is missing.
Detailed correlation between sub-blocks and power line according to Exynos SoC:
- In case of Exynos3250, there are two power line as following:
VDD_MIF |--- DMC
VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- PERIR
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
- In case of Exynos4210, there is one power line as following:
VDD_INT |--- DMC (parent device)
|--- LEFTBUS
|--- PERIL
|--- MFC(L)
|--- G3D
|--- TV
|--- LCD0
|--- RIGHTBUS
|--- PERIR
|--- MFC(R)
|--- CAM
|--- FSYS
|--- GPS
|--- LCD0
|--- LCD1
- In case of Exynos4x12, there are two power line as following:
VDD_MIF |--- DMC
VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC(L)
|--- G3D
|--- TV
|--- IMAGE
|--- RIGHTBUS
|--- PERIR
|--- MFC(R)
|--- CAM
|--- FSYS
|--- GPS
|--- LCD0
|--- ISP
- In case of Exynos5422, there are two power line as following:
VDD_MIF |--- DREX 0 (parent device, DRAM EXpress controller)
|--- DREX 1
VDD_INT |--- NoC_Core (parent device)
|--- G2D
|--- G3D
|--- DISP1
|--- NoC_WCORE
|--- GSCL
|--- MSCL
|--- ISP
|--- MFC
|--- GEN
|--- PERIS
|--- PERIC
|--- FSYS
|--- FSYS2
- In case of Exynos5433, there is VDD_INT power line as following:
VDD_INT |--- G2D (parent device)
|--- MSCL
|--- GSCL
|--- JPEG
|--- MFC
|--- HEVC
|--- BUS0
|--- BUS1
|--- BUS2
|--- PERIS (Fixed clock rate)
|--- PERIC (Fixed clock rate)
|--- FSYS (Fixed clock rate)
Example 1:
Show the AXI buses of Exynos3250 SoC. Exynos3250 divides the buses to
power line (regulator). The MIF (Memory Interface) AXI bus is used to
transfer data between DRAM and CPU and uses the VDD_MIF regulator.
- MIF (Memory Interface) block
: VDD_MIF |--- DMC (Dynamic Memory Controller)
- INT (Internal) block
: VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
- MIF bus's frequency/voltage table
-----------------------
|Lv| Freq | Voltage |
-----------------------
|L1| 50000 |800000 |
|L2| 100000 |800000 |
|L3| 134000 |800000 |
|L4| 200000 |825000 |
|L5| 400000 |875000 |
-----------------------
- INT bus's frequency/voltage table
----------------------------------------------------------
|Block|LEFTBUS|RIGHTBUS|MCUISP |ISP |PERIL ||VDD_INT |
| name| |LCD0 | | | || |
| | |FSYS | | | || |
| | |MFC | | | || |
----------------------------------------------------------
|Mode |*parent|passive |passive|passive|passive|| |
----------------------------------------------------------
|Lv |Frequency ||Voltage |
----------------------------------------------------------
|L1 |50000 |50000 |50000 |50000 |50000 ||900000 |
|L2 |80000 |80000 |80000 |80000 |80000 ||900000 |
|L3 |100000 |100000 |100000 |100000 |100000 ||1000000 |
|L4 |134000 |134000 |200000 |200000 | ||1000000 |
|L5 |200000 |200000 |400000 |300000 | ||1000000 |
----------------------------------------------------------
Example 2:
The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi
is listed below:
bus_dmc: bus_dmc {
compatible = "samsung,exynos-bus";
clocks = <&cmu_dmc CLK_DIV_DMC>;
clock-names = "bus";
operating-points-v2 = <&bus_dmc_opp_table>;
status = "disabled";
};
bus_dmc_opp_table: opp_table1 {
compatible = "operating-points-v2";
opp-shared;
opp-50000000 {
opp-hz = /bits/ 64 <50000000>;
opp-microvolt = <800000>;
};
opp-100000000 {
opp-hz = /bits/ 64 <100000000>;
opp-microvolt = <800000>;
};
opp-134000000 {
opp-hz = /bits/ 64 <134000000>;
opp-microvolt = <800000>;
};
opp-200000000 {
opp-hz = /bits/ 64 <200000000>;
opp-microvolt = <825000>;
};
opp-400000000 {
opp-hz = /bits/ 64 <400000000>;
opp-microvolt = <875000>;
};
};
bus_leftbus: bus_leftbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDL>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_rightbus: bus_rightbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDR>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_lcd0: bus_lcd0 {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_160>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_fsys: bus_fsys {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_200>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_mcuisp: bus_mcuisp {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_400_MCUISP>;
clock-names = "bus";
operating-points-v2 = <&bus_mcuisp_opp_table>;
status = "disabled";
};
bus_isp: bus_isp {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_266>;
clock-names = "bus";
operating-points-v2 = <&bus_isp_opp_table>;
status = "disabled";
};
bus_peril: bus_peril {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_100>;
clock-names = "bus";
operating-points-v2 = <&bus_peril_opp_table>;
status = "disabled";
};
bus_mfc: bus_mfc {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_SCLK_MFC>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_leftbus_opp_table: opp_table1 {
compatible = "operating-points-v2";
opp-shared;
opp-50000000 {
opp-hz = /bits/ 64 <50000000>;
opp-microvolt = <900000>;
};
opp-80000000 {
opp-hz = /bits/ 64 <80000000>;
opp-microvolt = <900000>;
};
opp-100000000 {
opp-hz = /bits/ 64 <100000000>;
opp-microvolt = <1000000>;
};
opp-134000000 {
opp-hz = /bits/ 64 <134000000>;
opp-microvolt = <1000000>;
};
opp-200000000 {
opp-hz = /bits/ 64 <200000000>;
opp-microvolt = <1000000>;
};
};
bus_mcuisp_opp_table: opp_table2 {
compatible = "operating-points-v2";
opp-shared;
opp-50000000 {
opp-hz = /bits/ 64 <50000000>;
};
opp-80000000 {
opp-hz = /bits/ 64 <80000000>;
};
opp-100000000 {
opp-hz = /bits/ 64 <100000000>;
};
opp-200000000 {
opp-hz = /bits/ 64 <200000000>;
};
opp-400000000 {
opp-hz = /bits/ 64 <400000000>;
};
};
bus_isp_opp_table: opp_table3 {
compatible = "operating-points-v2";
opp-shared;
opp-50000000 {
opp-hz = /bits/ 64 <50000000>;
};
opp-80000000 {
opp-hz = /bits/ 64 <80000000>;
};
opp-100000000 {
opp-hz = /bits/ 64 <100000000>;
};
opp-200000000 {
opp-hz = /bits/ 64 <200000000>;
};
opp-300000000 {
opp-hz = /bits/ 64 <300000000>;
};
};
bus_peril_opp_table: opp_table4 {
compatible = "operating-points-v2";
opp-shared;
opp-50000000 {
opp-hz = /bits/ 64 <50000000>;
};
opp-80000000 {
opp-hz = /bits/ 64 <80000000>;
};
opp-100000000 {
opp-hz = /bits/ 64 <100000000>;
};
};
Usage case to handle the frequency and voltage of bus on runtime
in exynos3250-rinato.dts is listed below:
&bus_dmc {
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>; /* VDD_MIF */
status = "okay";
};
&bus_leftbus {
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
status = "okay";
};
&bus_rightbus {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_lcd0 {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_fsys {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_mcuisp {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_isp {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_peril {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_mfc {
devfreq = <&bus_leftbus>;
status = "okay";
};
Example 3:
An interconnect path "bus_display -- bus_leftbus -- bus_dmc" on
Exynos4412 SoC with video mixer as an interconnect consumer device.
soc {
bus_dmc: bus_dmc {
compatible = "samsung,exynos-bus";
clocks = <&clock CLK_DIV_DMC>;
clock-names = "bus";
operating-points-v2 = <&bus_dmc_opp_table>;
samsung,data-clock-ratio = <4>;
#interconnect-cells = <0>;
};
bus_leftbus: bus_leftbus {
compatible = "samsung,exynos-bus";
clocks = <&clock CLK_DIV_GDL>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
#interconnect-cells = <0>;
interconnects = <&bus_dmc>;
};
bus_display: bus_display {
compatible = "samsung,exynos-bus";
clocks = <&clock CLK_ACLK160>;
clock-names = "bus";
operating-points-v2 = <&bus_display_opp_table>;
#interconnect-cells = <0>;
interconnects = <&bus_leftbus &bus_dmc>;
};
bus_dmc_opp_table: opp_table1 {
compatible = "operating-points-v2";
/* ... */
}
bus_leftbus_opp_table: opp_table3 {
compatible = "operating-points-v2";
/* ... */
};
bus_display_opp_table: opp_table4 {
compatible = "operating-points-v2";
/* .. */
};
&mixer {
compatible = "samsung,exynos4212-mixer";
interconnects = <&bus_display &bus_dmc>;
/* ... */
};
};

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Documentation/devicetree/bindings/interconnect/samsung,exynos-bus.yaml Normal file
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@ -0,0 +1,290 @@
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/interconnect/samsung,exynos-bus.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung Exynos SoC Bus and Interconnect
maintainers:
- Chanwoo Choi <cw00.choi@samsung.com>
- Krzysztof Kozlowski <krzk@kernel.org>
description: |
The Samsung Exynos SoC has many buses for data transfer between DRAM and
sub-blocks in SoC. Most Exynos SoCs share the common architecture for buses.
Generally, each bus of Exynos SoC includes a source clock and a power line,
which are able to change the clock frequency of the bus in runtime. To
monitor the usage of each bus in runtime, the driver uses the PPMU (Platform
Performance Monitoring Unit), which is able to measure the current load of
sub-blocks.
The Exynos SoC includes the various sub-blocks which have the each AXI bus.
The each AXI bus has the owned source clock but, has not the only owned power
line. The power line might be shared among one more sub-blocks. So, we can
divide into two type of device as the role of each sub-block. There are two
type of bus devices as following::
- parent bus device
- passive bus device
Basically, parent and passive bus device share the same power line. The
parent bus device can only change the voltage of shared power line and the
rest bus devices (passive bus device) depend on the decision of the parent
bus device. If there are three blocks which share the VDD_xxx power line,
Only one block should be parent device and then the rest blocks should depend
on the parent device as passive device.
VDD_xxx |--- A block (parent)
|--- B block (passive)
|--- C block (passive)
There are a little different composition among Exynos SoC because each Exynos
SoC has different sub-blocks. Therefore, such difference should be specified
in devicetree file instead of each device driver. In result, this driver is
able to support the bus frequency for all Exynos SoCs.
Detailed correlation between sub-blocks and power line according
to Exynos SoC::
- In case of Exynos3250, there are two power line as following::
VDD_MIF |--- DMC (Dynamic Memory Controller)
VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- PERIR
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
- MIF bus's frequency/voltage table
-----------------------
|Lv| Freq | Voltage |
-----------------------
|L1| 50000 |800000 |
|L2| 100000 |800000 |
|L3| 134000 |800000 |
|L4| 200000 |825000 |
|L5| 400000 |875000 |
-----------------------
- INT bus's frequency/voltage table
----------------------------------------------------------
|Block|LEFTBUS|RIGHTBUS|MCUISP |ISP |PERIL ||VDD_INT |
| name| |LCD0 | | | || |
| | |FSYS | | | || |
| | |MFC | | | || |
----------------------------------------------------------
|Mode |*parent|passive |passive|passive|passive|| |
----------------------------------------------------------
|Lv |Frequency ||Voltage |
----------------------------------------------------------
|L1 |50000 |50000 |50000 |50000 |50000 ||900000 |
|L2 |80000 |80000 |80000 |80000 |80000 ||900000 |
|L3 |100000 |100000 |100000 |100000 |100000 ||1000000 |
|L4 |134000 |134000 |200000 |200000 | ||1000000 |
|L5 |200000 |200000 |400000 |300000 | ||1000000 |
----------------------------------------------------------
- In case of Exynos4210, there is one power line as following::
VDD_INT |--- DMC (parent device, Dynamic Memory Controller)
|--- LEFTBUS
|--- PERIL
|--- MFC(L)
|--- G3D
|--- TV
|--- LCD0
|--- RIGHTBUS
|--- PERIR
|--- MFC(R)
|--- CAM
|--- FSYS
|--- GPS
|--- LCD0
|--- LCD1
- In case of Exynos4x12, there are two power line as following::
VDD_MIF |--- DMC (Dynamic Memory Controller)
VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC(L)
|--- G3D
|--- TV
|--- IMAGE
|--- RIGHTBUS
|--- PERIR
|--- MFC(R)
|--- CAM
|--- FSYS
|--- GPS
|--- LCD0
|--- ISP
- In case of Exynos5422, there are two power line as following::
VDD_MIF |--- DREX 0 (parent device, DRAM EXpress controller)
|--- DREX 1
VDD_INT |--- NoC_Core (parent device)
|--- G2D
|--- G3D
|--- DISP1
|--- NoC_WCORE
|--- GSCL
|--- MSCL
|--- ISP
|--- MFC
|--- GEN
|--- PERIS
|--- PERIC
|--- FSYS
|--- FSYS2
- In case of Exynos5433, there is VDD_INT power line as following::
VDD_INT |--- G2D (parent device)
|--- MSCL
|--- GSCL
|--- JPEG
|--- MFC
|--- HEVC
|--- BUS0
|--- BUS1
|--- BUS2
|--- PERIS (Fixed clock rate)
|--- PERIC (Fixed clock rate)
|--- FSYS (Fixed clock rate)
properties:
compatible:
enum:
- samsung,exynos-bus
clocks:
maxItems: 1
clock-names:
items:
- const: bus
devfreq:
$ref: /schemas/types.yaml#/definitions/phandle
description:
Parent bus device. Valid and required only for the passive bus devices.
devfreq-events:
$ref: /schemas/types.yaml#/definitions/phandle-array
minItems: 1
maxItems: 4
description:
Devfreq-event device to monitor the current utilization of buses. Valid
and required only for the parent bus devices.
exynos,saturation-ratio:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Percentage value which is used to calibrate the performance count against
total cycle count. Valid only for the parent bus devices.
'#interconnect-cells':
const: 0
interconnects:
minItems: 1
maxItems: 2
operating-points-v2: true
samsung,data-clock-ratio:
$ref: /schemas/types.yaml#/definitions/uint32
default: 8
description:
Ratio of the data throughput in B/s to minimum data clock frequency in
Hz.
vdd-supply:
description:
Main bus power rail. Valid and required only for the parent bus devices.
required:
- compatible
- clocks
- clock-names
- operating-points-v2
additionalProperties: false
examples:
- |
#include <dt-bindings/clock/exynos3250.h>
bus-dmc {
compatible = "samsung,exynos-bus";
clocks = <&cmu_dmc CLK_DIV_DMC>;
clock-names = "bus";
operating-points-v2 = <&bus_dmc_opp_table>;
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>;
};
ppmu_dmc0: ppmu@106a0000 {
compatible = "samsung,exynos-ppmu";
reg = <0x106a0000 0x2000>;
events {
ppmu_dmc0_3: ppmu-event3-dmc0 {
event-name = "ppmu-event3-dmc0";
};
};
};
bus_leftbus: bus-leftbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDL>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
};
bus-rightbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDR>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
devfreq = <&bus_leftbus>;
};
- |
dmc: bus-dmc {
compatible = "samsung,exynos-bus";
clocks = <&clock CLK_DIV_DMC>;
clock-names = "bus";
operating-points-v2 = <&bus_dmc_opp_table>;
samsung,data-clock-ratio = <4>;
#interconnect-cells = <0>;
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>;
};
leftbus: bus-leftbus {
compatible = "samsung,exynos-bus";
clocks = <&clock CLK_DIV_GDL>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
interconnects = <&dmc>;
#interconnect-cells = <0>;
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
};
display: bus-display {
compatible = "samsung,exynos-bus";
clocks = <&clock CLK_DIV_ACLK_266>;
clock-names = "bus";
operating-points-v2 = <&bus_display_opp_table>;
interconnects = <&leftbus &dmc>;
#interconnect-cells = <0>;
devfreq = <&leftbus>;
};

2
MAINTAINERS
View File

@ -4374,7 +4374,7 @@ L: linux-pm@vger.kernel.org
L: linux-samsung-soc@vger.kernel.org
S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
F: Documentation/devicetree/bindings/devfreq/exynos-bus.txt
F: Documentation/devicetree/bindings/interconnect/samsung,exynos-bus.yaml
F: drivers/devfreq/exynos-bus.c
BUSLOGIC SCSI DRIVER