[参考译文] J722SXH01EVM：/dev/spidevB.C (基于 mcspi 的传输速度、具有 spidev_test.c)

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1517795/j722sxh01evm-dev-spidevb-c-on-mcspi-transfer-speed-with-spidev_test-c

器件型号：J722SXH01EVM

工具/软件：

您好 e2e：

我看到`tools/spi/spidev_test.c` mcspi 上的报告传输速率约为8mbps (1M 字节/秒)。

是否与预期数量有关？请提出建议。

在由跳线连接的测试 MISO-MOSI 环中。

j722s-evm-kkonaka:~/spidev_test$ ./spidev_test -D /dev/spidev3.0 -s 50000000 -I 7000 -S 4096
spi mode: 0x0
bits per word: 8
max speed: 50000000 Hz (50000 kHz)
rate: tx 7399.0kbps, rx 7399.0kbps
rate: tx 7903.6kbps, rx 7903.6kbps
rate: tx 7910.2kbps, rx 7910.2kbps
rate: tx 7903.6kbps, rx 7903.6kbps
rate: tx 7910.2kbps, rx 7910.2kbps
total: tx 28000.0KB, rx 28000.0KB
j722s-evm-kkonaka:~/spidev_test$ ./spidev_test -D /dev/spidev1.0 -s 50000000 -I 7000 -S 4096
spi mode: 0x0
bits per word: 8
max speed: 50000000 Hz (50000 kHz)
rate: tx 7058.2kbps, rx 7058.2kbps
rate: tx 7831.6kbps, rx 7831.6kbps
rate: tx 7844.7kbps, rx 7844.7kbps
rate: tx 7844.7kbps, rx 7844.7kbps
rate: tx 7838.1kbps, rx 7838.1kbps
total: tx 28000.0KB, rx 28000.0KB
j722s-evm-kkonaka:~/spidev_test$

j722s-evm-kkonaka:~/spidev_test$ sudo find /sys/devices/platform -name "*spidev*0"
/sys/devices/platform/bus@f0000/20100000.spi/spi_slave/spi2/spi2.0/spidev/spidev2.0
/sys/devices/platform/bus@f0000/20120000.spi/spi_master/spi3/spi3.0/spidev/spidev3.0
/sys/devices/platform/bus@f0000/bus@f0000:bus@4000000/4b00000.spi/spi_master/spi1/spi1.0/spidev/spidev1.0
j722s-evm-kkonaka:~/spidev_test$

j722s-evm-kkonaka:~/spidev_test$ sudo find /sys/devices/platform -name "spi[0123]"
/sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/spi_master/spi0
/sys/devices/platform/bus@f0000/20100000.spi/spi_slave/spi2
/sys/devices/platform/bus@f0000/20120000.spi/spi_master/spi3
/sys/devices/platform/bus@f0000/bus@f0000:bus@4000000/4b00000.spi/spi_master/spi1
j722s-evm-kkonaka:~/spidev_test$

j722s-evm-kkonaka:~/spidev_test$ dtc -I fs -O dts /proc/device-tree 2>/dev/null| grep =.*/spi@|sort
                main_spi0 = "/bus@f0000/spi@20100000";
                main_spi1 = "/bus@f0000/spi@20110000";
                main_spi2 = "/bus@f0000/spi@20120000";
                mcu_spi0 = "/bus@f0000/bus@4000000/spi@4b00000";
                mcu_spi1 = "/bus@f0000/bus@4000000/spi@4b10000";
                ospi0 = "/bus@f0000/bus@fc00000/spi@fc40000";
                ospi0_nand = "/bus@f0000/bus@fc00000/spi@fc40000/nand@0";
                ospi0_nor = "/bus@f0000/bus@fc00000/spi@fc40000/flash@0";
j722s-evm-kkonaka:~/spidev_test$

内核配置 diff：

$ git diff ac935f637d6559a87f39230d3344cb275129ad47 -- kernel/configs/ti_arm64_prune.config
diff --git a/kernel/configs/ti_arm64_prune.config b/kernel/configs/ti_arm64_prune.config
index fbdb3225671e..4aa5d6e8dd06 100644
--- a/kernel/configs/ti_arm64_prune.config
+++ b/kernel/configs/ti_arm64_prune.config
@@ -492,3 +492,11 @@ CONFIG_DVB_TDA665x=n
 CONFIG_DVB_DRX39XYJ=n
 CONFIG_DVB_CXD2099=n
 CONFIG_DVB_SP2=n
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_I2C_DEBUG_CORE=y
+CONFIG_I2C_DEBUG_ALGO=y
+CONFIG_I2C_DEBUG_BUS=y
+CONFIG_DEBUG_DRIVER=y
+CONFIG_TEST_DYNAMIC_DEBUG=y
+CONFIG_SPI_SPIDEV=y
+CONFIG_SPI_OMAP24XX=y
$

器件树叠加层：

// SPDX-License-Identifier: GPL-2.0
/*
 * see software-dl.ti.com/.../SPI.html
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>
#include "k3-pinctrl.h"

//  mcu_spi0 = "/bus@f0000/bus@4000000/spi@4b00000";
//  mcu_spi1 = "/bus@f0000/bus@4000000/spi@4b10000";
//  main_spi0 = "/bus@f0000/spi@20100000";
//  main_spi1 = "/bus@f0000/spi@20110000";
//  main_spi2 = "/bus@f0000/spi@20120000";

/*
 * Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
 */
&{/chosen} {
        overlays {
                 k3-j722s-evm-spidev.kernel = __TIMESTAMP__;
        };
};

&main_pmx0 {
        main_spi2_pins_default: main-spi2-pins-default {
                // F24 SPI2_CLK IO SPI Clock 
                // C27 SPI2_CS0 IO SPI Chip Select 0
                // D25 SPI2_CS1 IO SPI Chip Select 1
                // B25 SPI2_CS2 IO SPI Chip Select 2
                // C26 SPI2_CS3 IO SPI Chip Select 3
                // A25 SPI2_D0 IO SPI Data 0
                // A26 SPI2_D1 IO SPI Data 1
                pinctrl-single,pins = <
                        J722S_IOPAD(0x01b0, PIN_OUTPUT, 1) /* (F24) SPI2_CLK IO SPI Clock */
                        J722S_IOPAD(0x0194, PIN_INPUT,  1) /* (A25) SPI2_D0 IO SPI Data 0 */
                        J722S_IOPAD(0x0198, PIN_OUTPUT, 1) /* (A26) SPI2_D1 IO SPI Data 1 */
                        J722S_IOPAD(0x01ac, PIN_OUTPUT, 1) /* (C27) SPI2_CS0 IO SPI Chip Select 0 */
                >;
        };
        main_spi0_pins_default: main-spi0-pins-default {
                // D20 SPI0_CLK IO SPI Clock
                // B20 SPI0_CS0 IO SPI Chip Select 0
                // C20 SPI0_CS1 IO SPI Chip Select 1
                // E22 SPI0_CS2 IO SPI Chip Select 2
                // B21 SPI0_CS3 IO SPI Chip Select 3 
                // E19 SPI0_D0 IO SPI Data 0 E19      
                // E20 SPI0_D1 IO SPI Data 1 E20      
                pinctrl-single,pins = <
                        J722S_IOPAD(0x01bc, PIN_INPUT, 0) /* (D20) SPI0_CLK IO SPI Clock */
                        J722S_IOPAD(0x01c0, PIN_INPUT, 0) /* (E19) SPI0_D0 IO SPI Data 0 */
                        J722S_IOPAD(0x01c4, PIN_INPUT, 0) /* (E20) SPI0_D1 IO SPI Data 1 */
                        J722S_IOPAD(0x01b4, PIN_INPUT, 0) /* (B20) SPI0_CS0 IO SPI Chip Select 0 */
                >;
        };
};

// enable only spi2 and spi0. spi1 is not well arranged on TI evaluation board.

&main_spi2 {
        status = "okay";
        #address-cells = <1>;
        #size-cells = <0>;
        pinctrl-0 = <&main_spi2_pins_default>;
        pinctrl-names = "default";
        spidev@0 {
                 spi-max-frequency = <24000000>;
                 reg = <0>;
                 compatible = "rohm,dh2228fv";
        };
};

&main_spi0 {
        status = "okay";
        #address-cells = <1>;
        #size-cells = <0>;
        pinctrl-0 = <&main_spi0_pins_default>;
        pinctrl-names = "default";
        spi-slave;
        slave@0 {
                 spi-max-frequency = <24000000>;
                 reg = <0>;
                 compatible = "rohm,dh2228fv";
        };
};

&mcu_pmx0 {
        mcu_spi0_pins_default: mcu-spi0-pins-default {
                // A9 MCU_SPI0_CLK IO SPI Clock
                // C12 MCU_SPI0_CS0 IO SPI Chip Select 0
                // A10 MCU_SPI0_CS2 IO SPI Chip Select 2
                // B12 MCU_SPI0_D0 IO SPI Data 0
                // C11 MCU_SPI0_D1 IO SPI Data 1
        	pinctrl-single,pins = <
                        J722S_MCU_IOPAD(0x0008, PIN_INPUT, 0) /* (A9) MCU_SPI0_CLK IO SPI Clock */
                        J722S_MCU_IOPAD(0x000c, PIN_INPUT, 0) /* (B12) MCU_SPI0_D0 IO SPI Data 0 */
                        J722S_MCU_IOPAD(0x0010, PIN_INPUT, 0) /* (C11) MCU_SPI0_D1 IO SPI Data 1 */
                        J722S_MCU_IOPAD(0x0000, PIN_INPUT, 0) /* (C12) MCU_SPI0_CS0 IO SPI Chip Select 0 */
                >;
        };
};

&mcu_spi0 {
        status = "okay";
        #address-cells = <1>;
        #size-cells = <0>;
        pinctrl-0 = <&mcu_spi0_pins_default>;
        pinctrl-names = "default";
        spidev@0 {
                 spi-max-frequency = <24000000>;
                 reg = <0>;
                 compatible = "rohm,dh2228fv";
        };
};

TI SDK；SDK-LINUX-edgeai 10_01_00_04

3 个月前

0 admin 3 个月前

TI__Guru**** 2331900 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

DMA 未开启。正在更新设备树条目... 以下帮助

现在我看到：

root@j722s-evm-kkonaka:/home/kkonaka/spidev_test# ./spidev_test -D /dev/spidev3.0 -d 0 -s 50000000 -I 1000 -S 65536
spi mode: 0x0
bits per word: 8
max speed: 50000000 Hz (50000 kHz)
rate: tx 19188.9kbps, rx 19188.9kbps
rate: tx 22859.0kbps, rx 22859.0kbps
rate: tx 22649.2kbps, rx 22649.2kbps
rate: tx 22754.1kbps, rx 22754.1kbps
total: tx 64000.0KB, rx 64000.0KB
root@j722s-evm-kkonaka:/home/kkonaka/spidev_test#

这是否与一些预期的数字类似？

0 admin 3 个月前

TI__Guru**** 2331900 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

现在、以下额外的 DTS 覆盖可以让 A53在 MAIN_SPI2@20120000 和 MAIN_spi0@20100000上使用 DMA、但 MCU_spi0@4b00000上不使用 DMA (Pio 正常)。

我认为这是预期的、DMA 控制器需要是 MCU 域的控制器、但这可能是什么？以下哪一项？？？

main_bcdma_csi ="/bus@f0000/bus@4e000000/dma-controller@4e230000"；
MAIN_bcdma ="/bus@f0000/bus@48000000/DMA-controller@485c0100"；
main_pktdma ="/bus@f0000/bus@48000000/dma-controller@485c0000"；

$ git diff HEAD^^ --    arch/arm64/boot/dts/ti/k3-j722s-evm-spidev.dtso
diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm-spidev.dtso b/arch/arm64/boot/dts/ti/k3-j722s-evm-spidev.dtso
index 89fb76753d4b..3f4a44658cd9 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-evm-spidev.dtso
+++ b/arch/arm64/boot/dts/ti/k3-j722s-evm-spidev.dtso
@@ -65,6 +65,8 @@ &main_spi2 {
         #size-cells = <0>;
         pinctrl-0 = <&main_spi2_pins_default>;
         pinctrl-names = "default";
+       dmas = <&main_pktdma 0xc308 0>, <&main_pktdma 0x4308 0>;
+       dma-names = "tx0", "rx0";
         spidev@0 {
                  spi-max-frequency = <24000000>;
                  reg = <0>;
@@ -78,7 +80,9 @@ &main_spi0 {
         #size-cells = <0>;
         pinctrl-0 = <&main_spi0_pins_default>;
         pinctrl-names = "default";
-        spi-slave;
+       dmas = <&main_pktdma 0xc300 0>, <&main_pktdma 0x4300 0>;
+       dma-names = "tx0", "rx0";
+//        spi-slave;
         slave@0 {
                  spi-max-frequency = <24000000>;
                  reg = <0>;
@@ -108,6 +112,8 @@ &mcu_spi0 {
         #size-cells = <0>;
         pinctrl-0 = <&mcu_spi0_pins_default>;
         pinctrl-names = "default";
+//     dmas = <&main_pktdma 0xc300 0>, <&main_pktdma 0x4300 0>;
+//     dma-names = "tx0", "rx0";
         spidev@0 {
                  spi-max-frequency = <24000000>;
                  reg = <0>;
$

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[参考译文] J722SXH01EVM：/dev/spidevB.C (基于 mcspi 的传输速度、具有 spidev_test.c)