The aim of this document is to explain how to setup pins of SP7350 in device-tree source. SP7350 has 106 general purpose IO (GPIO) pins which are multiplexed with other special functions, like eMMC device, SPI-NOR flash, SPI-NAND flash, Ethernet PHY (RGMII or RMII interface), UART, I2C pins, and etc.
The following sections will explain how to setup GPIOs and special function pins in device-tree source file. Note that the same device-tree source file is used by U-Boot and Linux in SP7350. Both Pinctrl drivers support generic helper bindings.
Table of Contents
| Table of Contents |
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IO Pins
In the Linux, name of IO pin is in form of GPIO(id), like GPIO0, GPIO1, GPIO2, …, GPIO105, and etc. These IO pins of SP7350 are categorized, based on their operating voltage, into two groups:
...
GPIO # | Power domain | Type | Pin name | Power-supply |
0 - 19 | Main | 1.8V GPIO | G_MX0 - G_MX19 | VDDPST18_GPIO |
20 | 1.8V/3.0V DVIO | G_MX20 | VDDPST3018_DVIO_2 | |
21 - 27 | G_MX21 - G_MX27 | VDDPST3018_DVIO_1 | ||
28 - 37 | G_MX28 - G_MX37 | VDDPST3018_DVIO_2 | ||
38 - 43 | G_MX38 - G_MX43 | AVDDIO_3018_SD | ||
44 - 49 | G_MX44 - G_MX49 | AVDDIO_3018_SDIO | ||
50 - 59 | CM4 (AO) | AO_MX0 - AO_MX9 | VDDPST3018_DVIO_AO_1 | |
60 - 69 | AO_MX10 - AO_MX19 | VDDPST3018_DVIO_AO_2 | ||
70 - 79 | AO_MX20 - AO_MX29 | VDDPST3018_DVIO_AO_3 | ||
80 - 98 | 1.8V GPIO | AO_MX30 - AO_MX48 | VDDPST18_GPIO_AO | |
99 - 105 | IV_MX0 - IV_MX6 |
Voltage Mode Select
Beyond configuring the 1.8V or 3.0V power to supply pins of a DVIO group in circuit boards (hardware), setting up the voltage mode select (ms control) control-bits is crucial for the normal operation of IO pins. The following properties configure voltage mode select control-bits in the Device Tree Source (DTS) file:
...
Default voltage is “3V0”.
Pin Multiplexing Nodes
function - the multiplex function to select.
groups - the list of groups to select with this function. Either this or "pins" must be specified.
pins - the list of pins to select with this function. Either this or "groups" must be specified.
Refer to examples below:
Set a Single Pin to GPIO function
| Code Block | ||
|---|---|---|
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pinmux_example {
function = "GPIO";
pins = "GPIO0";
}; |
Set pin GPIO0 to GPIO function.
Set Several Pins to GPIO function
| Code Block | ||
|---|---|---|
| ||
pinmux_example {
function = "GPIO";
pins = "GPIO0", "GPIO1", "GPIO10";
}; |
Set pins GPIO0, GPIO1, GPIO10 to GPIO function.
Set a Group of Pins to a Specified Function
| Code Block | ||
|---|---|---|
| ||
pinmux_example {
function = "UART0";
groups = "UART0_X1";
}; |
...
Refer to Function-group Table in appendix.
Pin Configuration Nodes
| Info |
|---|
Here we only list the generic pin configuration parameters supported by SP7350. |
...
| Code Block | ||
|---|---|---|
| ||
pinconf_example {
:
:
sunplus,bias-strong-pull-up;
:
:
}; |
DTS Files
Device-tree source files of SP7350 are located in linux/kernel/arch/arm64/boot/dts/sunplus/.
...
Boards | Device-tree source files |
C3V-W Evaluation Board | sp7350-ev.dts |
C3V-W Demo Board | sp7350-dm.dts |
Example
Voltage Mode Select
For 1.8V/3.0V Dual Voltage IO (DVIO) pins, we need to select their voltage in pinctrl top node in DTS file. For example,
...
In this example, DVIO groups 0 and 1 are configured to operate at 1.8V, while DVIO AO group 0 is designated with a voltage setting of 1.8V. Conversely, DVIO AO groups 1 and 2 are specifically set to operate at 3.0V. It is crucial to note that in the absence of a specified selection, the default voltage for these groups is set to 3.0V.
GPIO
SP7350 has 106 general purpose IO (GPIO) pins. Most of them are multiplexed with other special function pins. This section explains how to modify device-tree source file to set up GPIO pins as digital input or output pins.
Define GPIO in device-tree source file
Every single device has a node in device-tree source (dts) file in Linux. Property pinctrl-0 (or pinctrl-1, pinctrl-2,… if a device has more states) is used to point at pin configuration node within pin controller (node pinctrl@f8800080 in SP7350). Pin configuration nodes (sub-nodes in node pinctrl@f8800080 ) define the actual pins assignment.
...
| Code Block | ||
|---|---|---|
| ||
typec_pins: pinmux_typec-pins {
function = "GPIO";
pins = "GPIO98";
}; |
Setting GPIO Characteristics
GPIO pins' characteristics, such as setting them to high, low, or configuring additional features, can also be directly specified within the pin node. For instance, we extend the previous example to add GPIO0 and GPIO1 and configure them as input and output, respectively. We introduce the extra_gpio_pins node label after typec_pins:
...
In the extra_gpio-pins node, GPIO0 is configured as an input with Schmitt trigger. Meanwhile, GPIO1 is configured as an output set to low, with a specified drive strength.
Special Function Pins
Some devices pins of SP7350 are multiplexed to specified pin-group of SP7350. This section explains how to modify device-tree source file to enable pins of those devices.
Every device should have a node in device-tree source (dts) file in Linux. Property pinctrl-0 (or pinctrl-1, pinctrl-2,… if a device has more states) is used to point at pin configuration node within pin controller (node pinctrl@f8800080 in SP7021). Pin configuration nodes (sub-nodes in node pinctrl@f8800080 ) define the actual pins assignment. For examples:
pinmux
eMMC device:
Pins of eMMC of SP7350, [D5, D3, D4, D0, D1, CLK, D2, D7, D6, CMD, DS], can be multiplexed to pin-group GPIO [20, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37].
...
Refer to "Function-group Table" in Appendix.
pinconf
One Configuration to All Pins.
...
Refer to Driving-strength Table of GPIO and Driving-strength Table of DVIO in Appendix.
Appendix
List of Support Properties
Properties | Values | Descriptions |
bias-disable | NA | Disable pull-up, pull-down and strong pull-up |
bias-high-impedance | NA | |
bias-pull-up | NA | |
bias-pull-down | NA | |
drive-open-drain | NA | For GPIO or DVIO |
drive-strength-microamp | … | Refer to Driving-strength Table of GPIO and DVIO. |
function | … | Refer to Function-group Table |
groups | … | Refer to Function-group Table |
input-disable | NA | For GPIO or DVIO |
input-enable | NA | For GPIO or DVIO |
input-schmitt-disable | NA | |
input-schmitt-enable | NA | |
output-disable | NA | For GPIO or DVIO |
output-enable | NA | For GPIO or DVIO |
output-high | NA | For GPIO or DVIO |
output-low | NA | For GPIO or DVIO |
pins | “GPIO0” ~ “GPIO105” | |
sunplus,bias-strong-pull-up | NA | For GPIO only, excluding DVIO |
sunplus,input-invert-disable | NA | For GPIO or DVIO |
sunplus,input-invert-enable | NA | For GPIO or DVIO |
sunplus,ms-dvio-group-0 | “1V8” or “3V0” | For G_MX21 - G_MX27 |
sunplus,ms-dvio-group-1 | “1V8” or “3V0” | For G_MX20, G_MX28 - G_MX37 |
sunplus,ms-dvio-ao-group-0 | “1V8” or “3V0” | For AO_MX0 - AO_MX9 |
sunplus,ms-dvio-ao-group-1 | “1V8” or “3V0” | For AO_MX10 - AO_MX19 |
sunplus,ms-dvio-ao-group-2 | “1V8” or “3V0” | For AO_MX20 - AO_MX29 |
sunplus,output-invert-disable | NA | For GPIO or DVIO |
sunplus,output-invert-enable | NA | For GPIO or DVIO |
sunplus,slew-rate-control-disable | NA | |
sunplus,slew-rate-control-enable | NA |
Driving-strength Table of GPIO
# | Source current (mA) | Sink current (mA) | MACRO | ||||
Min. | Typ. | Max. | Min. | Typ. | Max. | ||
0 | 0.8 | 1.1 | 1.5 | 0.7 | 1.1 | 1.6 | SPPCTRL_GPIO_DRV_IOH_1100_IOL_1100UA |
1 | 1.1 | 1.6 | 2.2 | 1.1 | 1.7 | 2.3 | SPPCTRL_GPIO_DRV_IOH_1600_IOL_1700UA |
2 | 2.3 | 3.3 | 4.3 | 2.1 | 3.3 | 4.7 | SPPCTRL_GPIO_DRV_IOH_3300_IOL_3300UA |
3 | 3.4 | 4.9 | 6.5 | 3.2 | 5.0 | 7.0 | SPPCTRL_GPIO_DRV_IOH_4900_IOL_5000UA |
4 | 4.5 | 6.6 | 8.6 | 4.2 | 6.6 | 9.3 | SPPCTRL_GPIO_DRV_IOH_6600_IOL_6600UA |
5 | 5.7 | 8.2 | 10.8 | 5.3 | 8.3 | 11.7 | SPPCTRL_GPIO_DRV_IOH_8200_IOL_8300UA |
6 | 6.8 | 9.9 | 13.0 | 6.3 | 9.9 | 13.9 | SPPCTRL_GPIO_DRV_IOH_9900_IOL_9900UA |
7 | 7.9 | 11.5 | 15.1 | 7.4 | 11.6 | 16.2 | SPPCTRL_GPIO_DRV_IOH_11500_IOL_11600UA |
8 | 9.0 | 13.1 | 17.2 | 8.4 | 13.2 | 18.5 | SPPCTRL_GPIO_DRV_IOH_13100_IOL_13200UA |
9 | 10.2 | 14.8 | 19.4 | 9.4 | 14.8 | 20.8 | SPPCTRL_GPIO_DRV_IOH_14800_IOL_14800UA |
10 | 11.3 | 16.4 | 21.6 | 10.5 | 16.5 | 23.1 | SPPCTRL_GPIO_DRV_IOH_16400_IOL_16500UA |
11 | 12.4 | 18.1 | 23.7 | 11.5 | 18.1 | 25.4 | SPPCTRL_GPIO_DRV_IOH_18100_IOL_18100UA |
12 | 13.5 | 19.6 | 25.8 | 12.6 | 19.7 | 27.6 | SPPCTRL_GPIO_DRV_IOH_19600_IOL_19700UA |
13 | 14.7 | 21.3 | 28.0 | 13.6 | 21.4 | 29.9 | SPPCTRL_GPIO_DRV_IOH_21300_IOL_21400UA |
14 | 15.8 | 22.9 | 30.1 | 14.6 | 23.0 | 32.1 | SPPCTRL_GPIO_DRV_IOH_22900_IOL_23000UA |
15 | 16.9 | 24.6 | 32.3 | 15.7 | 24.6 | 34.4 | SPPCTRL_GPIO_DRV_IOH_24600_IOL_24600UA |
Driving-strength Table of DVIO
# | Source current (mA) | Sink current (mA) | MACRO | ||||
Min. | Typ. | Max. | Min. | Typ. | Max. | ||
0 | 1.9 | 5.1 | 9.9 | 4.0 | 6.2 | 8.6 | SPPCTRL_DVIO_DRV_IOH_5100_IOL_6200UA |
1 | 2.8 | 7.6 | 14.8 | 6.0 | 9.3 | 12.9 | SPPCTRL_DVIO_DRV_IOH_7600_IOL_9300UA |
2 | 3.7 | 10.1 | 19.8 | 8.1 | 12.5 | 17.1 | SPPCTRL_DVIO_DRV_IOH_10100_IOL_12500UA |
3 | 4.6 | 12.6 | 24.7 | 10.1 | 15.6 | 21.4 | SPPCTRL_DVIO_DRV_IOH_12600_IOL_15600UA |
4 | 5.6 | 15.2 | 29.7 | 12.1 | 18.7 | 25.7 | SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA |
5 | 6.5 | 17.7 | 34.6 | 14.1 | 21.8 | 29.9 | SPPCTRL_DVIO_DRV_IOH_17700_IOL_21800UA |
6 | 7.4 | 20.2 | 39.5 | 16.1 | 24.9 | 34.2 | SPPCTRL_DVIO_DRV_IOH_20200_IOL_24900UA |
7 | 8.3 | 22.7 | 44.3 | 18.1 | 27.9 | 38.4 | SPPCTRL_DVIO_DRV_IOH_22700_IOL_27900UA |
8 | 9.3 | 25.2 | 49.3 | 20.1 | 31.0 | 42.7 | SPPCTRL_DVIO_DRV_IOH_25200_IOL_31000UA |
9 | 10.2 | 27.7 | 54.2 | 22.1 | 34.1 | 46.9 | SPPCTRL_DVIO_DRV_IOH_27700_IOL_34100UA |
10 | 11.1 | 30.3 | 59.1 | 24.1 | 37.2 | 51.1 | SPPCTRL_DVIO_DRV_IOH_30300_IOL_37200UA |
11 | 12.0 | 32.8 | 64.0 | 26.1 | 40.3 | 55.3 | SPPCTRL_DVIO_DRV_IOH_32800_IOL_40300UA |
12 | 13.0 | 35.3 | 68.9 | 28.1 | 43.4 | 59.5 | SPPCTRL_DVIO_DRV_IOH_35300_IOL_43400UA |
13 | 13.9 | 37.8 | 73.7 | 30.1 | 46.4 | 63.8 | SPPCTRL_DVIO_DRV_IOH_37800_IOL_46400UA |
14 | 14.8 | 40.3 | 78.6 | 32.1 | 49.5 | 67.9 | SPPCTRL_DVIO_DRV_IOH_40300_IOL_49500UA |
15 | 15.7 | 42.7 | 83.4 | 34.1 | 52.6 | 72.1 | SPPCTRL_DVIO_DRV_IOH_42700_IOL_52600UA |
Function-group Table
function name | groups name | binding pins |
SPI_FLASH | SPI_FLASH | 21, 22, 23, 24, 25, 26 |
EMMC | EMMC | 20, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 |
SPI_NAND | SPI_NAND_X1 | 30, 31, 32, 33, 34, 35 |
SPI_NAND_X2 | 21, 22, 23, 24, 25, 26 | |
SD_CARD | SD_CARD | 38, 39, 40, 41, 42, 43 |
SDIO | SDIO | 44, 45, 46, 47, 48, 49 |
PARA_NAND | PARA_NAND | 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 |
USB_OTG | USB_OTG | 18, 19 |
GMAC | GMAC_RGMII | 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 |
GMAC_RMII | 4, 5, 6, 7, 8, 9, 10, 11, 12 | |
PWM0 | PWM0_X1 | 78 |
PWM0_X2 | 58 | |
PWM1 | PWM1_X1 | 79 |
PWM1_X2 | 59 | |
PWM2 | PWM2_X1 | 60 |
PWM2_X2 | 92 | |
PWM3 | PWM3_X1 | 61 |
PWM3_X2 | 93 | |
UART0 | UART0_X1 | 50, 51 |
UART0_X2 | 68, 69 | |
UART1 | UART1_X1 | 52, 53 |
UART1_X2 | 64, 65 | |
UART1_FC | UART1_FC_X1 | 54, 55 |
UART1_FC_X2 | 66, 67 | |
UART2 | UART2_X1 | 56, 57 |
UART2_X2 | 76, 77 | |
UART2_FC | UART2_FC_X1 | 58, 59 |
UART2_FC_X2 | 78, 79 | |
UART3 | UART3_X1 | 62, 63 |
UART3_X2 | 7, 8 | |
UADBG | UADBG | 13, 14 |
UART6 | UART6_X1 | 80, 81 |
UART6_X2 | 48, 49 | |
UART7 | UART7 | 82, 83 |
I2C_COMBO0 | I2C_COMBO0_X1 | 68, 69 |
I2C_COMBO0_X2 | 54, 55 | |
I2C_COMBO1 | I2C_COMBO1 | 70, 71 |
I2C_COMBO2 | I2C_COMBO2_X1 | 76, 77 |
I2C_COMBO2_X2 | 56, 57 | |
I2C_COMBO3 | I2C_COMBO3 | 88, 89 |
I2C_COMBO4 | I2C_COMBO4 | 90, 91 |
I2C_COMBO5 | I2C_COMBO5 | 92, 93 |
I2C_COMBO6 | I2C_COMBO6_X1 | 84, 85 |
I2C_COMBO6_X2 | 1, 2 | |
I2C_COMBO7 | I2C_COMBO7_X1 | 86, 87 |
I2C_COMBO7_X2 | 3, 4 | |
I2C_COMBO8 | I2C_COMBO8_X1 | 95, 96 |
I2C_COMBO8_X2 | 9, 10 | |
I2C_COMBO9 | I2C_COMBO9_X1 | 97, 98 |
I2C_COMBO9_X2 | 11, 12 | |
SPI_MASTER0 | SPI_MASTER0_X1 | 64, 65, 66, 67 |
SPI_MASTER0_X2 | 9, 10, 11, 12 | |
SPI_MASTER1 | SPI_MASTER1_X1 | 80, 81, 82, 83 |
SPI_MASTER1_X2 | 14, 15, 16, 17 | |
SPI_MASTER2 | SPI_MASTER2 | 88, 89, 90, 91 |
SPI_MASTER3 | SPI_MASTER3_X1 | 44, 45, 46, 47 |
SPI_MASTER3_X2 | 52, 53, 54, 55 | |
SPI_MASTER4 | SPI_MASTER4 | 72, 73, 74, 75 |
SPI_SLAVE0 | SPI_SLAVE0_X1 | 94, 95, 96, 97 |
SPI_SLAVE0_X2 | 72, 73, 74, 75 | |
AUD_TDMTX_XCK | AUD_TDMTX_XCK | 93 |
AUD_DAC_XCK1 | AUD_DAC_XCK1 | 71 |
AUD_DAC_XCK | AUD_DAC_XCK | 83 |
AUD_AU2_DATA0 | AUD_AU2_DATA0 | 82 |
AUD_AU1_DATA0 | AUD_AU1_DATA0 | 58 |
AUD_AU2_CK | AUD_AU2_CK | 80, 81 |
AUD_AU1_CK | AUD_AU1_CK | 56, 57 |
AUD_AU_ADC_DATA0 | AUD_AU_ADC_DATA0_X1 | 94, 95, 96, 97 |
AUD_AU_ADC_DATA0_X2 | 72, 73, 74, 75 | |
AUD_ADC2_DATA0 | AUD_ADC2_DATA0 | 82 |
AUD_ADC1_DATA0 | AUD_ADC1_DATA0 | 58 |
AUD_TDM | AUD_TDM | 94, 95, 96, 97 |
SPDIF_IN | SPDIF_IN_X1 | 91 |
SPDIF_IN_X2 | 53 | |
SPDIF_IN_X3 | 54 | |
SPDIF_IN_X4 | 55 | |
SPDIF_IN_X5 | 62 | |
SPDIF_IN_X6 | 52 | |
SPDIF_OUT | SPDIF_OUT_X1 | 91 |
SPDIF_OUT_X2 | 53 | |
SPDIF_OUT_X3 | 54 | |
SPDIF_OUT_X4 | 55 | |
SPDIF_OUT_X5 | 62 | |
SPDIF_OUT_X6 | 52 | |
INT0 | INT0_X1 | 1 |
INT0_X2 | 2 | |
INT0_X3 | 3 | |
INT0_X4 | 4 | |
INT0_X5 | 5 | |
INT0_X6 | 6 | |
INT0_X7 | 13 | |
INT0_X8 | 14 | |
INT0_X9 | 15 | |
INT1 | INT1_X1 | 1 |
INT1_X2 | 2 | |
INT1_X3 | 3 | |
INT1_X4 | 4 | |
INT1_X5 | 5 | |
INT1_X6 | 6 | |
INT1_X7 | 13 | |
INT1_X8 | 14 | |
INT1_X9 | 15 | |
INT2 | INT2_X1 | 5 |
INT2_X2 | 6 | |
INT2_X3 | 7 | |
INT2_X4 | 8 | |
INT2_X5 | 9 | |
INT2_X6 | 10 | |
INT2_X7 | 11 | |
INT2_X8 | 16 | |
INT2_X9 | 17 | |
INT3 | INT3_X1 | 5 |
INT3_X2 | 6 | |
INT3_X3 | 7 | |
INT3_X4 | 8 | |
INT3_X5 | 9 | |
INT3_X6 | 10 | |
INT3_X7 | 11 | |
INT3_X8 | 16 | |
INT3_X9 | 17 | |
INT4 | INT4_X1 | 7 |
INT4_X2 | 8 | |
INT4_X3 | 9 | |
INT4_X4 | 10 | |
INT4_X5 | 11 | |
INT4_X6 | 12 | |
INT4_X7 | 13 | |
INT4_X8 | 18 | |
INT4_X9 | 19 | |
INT5 | INT5_X1 | 7 |
INT5_X2 | 8 | |
INT5_X3 | 9 | |
INT5_X4 | 10 | |
INT5_X5 | 11 | |
INT5_X6 | 12 | |
INT5_X7 | 13 | |
INT5_X8 | 18 | |
INT5_X9 | 19 | |
INT6 | INT6_X1 | 9 |
INT6_X2 | 10 | |
INT6_X3 | 11 | |
INT6_X4 | 12 | |
INT6_X5 | 13 | |
INT6_X6 | 14 | |
INT6_X7 | 15 | |
INT6_X8 | 16 | |
INT6_X9 | 17 | |
INT6_X10 | 18 | |
INT6_X11 | 19 | |
INT7 | INT7_X1 | 9 |
INT7_X2 | 10 | |
INT7_X3 | 11 | |
INT7_X4 | 12 | |
INT7_X5 | 13 | |
INT7_X6 | 14 | |
INT7_X7 | 15 | |
INT7_X8 | 16 | |
INT7_X9 | 17 | |
INT7_X10 | 18 | |
INT7_X11 | 19 | |
GPIO_AO_INT0 | GPIO_AO_INT0_X1 | 52, 53, 54, 55, 56, 57, 58, 59 |
GPIO_AO_INT0_X2 | 68, 69, 70, 71, 72, 73, 74, 75 | |
GPIO_AO_INT1 | GPIO_AO_INT1_X1 | 60, 61, 62, 63, 64, 65, 66, 67 |
GPIO_AO_INT1_X2 | 76, 77, 78, 79, 80, 81, 82, 83 | |
GPIO_AO_INT2 | GPIO_AO_INT2_X1 | 68, 69, 70, 71, 72, 73, 74, 75 |
GPIO_AO_INT2_X2 | 84, 85, 86, 87, 88, 89, 90, 91 | |
GPIO_AO_INT3 | GPIO_AO_INT3_X1 | 76, 77, 78, 79, 80, 81, 82, 83 |
GPIO_AO_INT3_X2 | 91, 92, 93, 94, 95, 96, 97, 98 |