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器件型号：SK-AM68 主题中讨论的其他器件：AM68、 SysConfig
工具与软件：
您好！
我目前正在尝试将 am68配置为 SPI 从器件、通过基础板的40引脚接头接收来自外部主器件的信号。 我目前的问题是、当我使用 ioctl 尝试从 spidev0.0读取时、它在函数调用中挂起、我怀疑这是因为没有接收到时钟信号。 我主要想知道我的引脚配置或 DMA 配置是否错误。 以下是我到目前为止采取的步骤：
1) 1)启用40引脚接头-我手动将 k3-am68-sk-rpi-hdr-ehrpwm.dtbo 添加到 meta-ti 中 am68-sk.conf 文件中的 kernel_DEVICETREE 字符串中。
2) 2)创建一个 MCU_SPI1器件(这是 PROC125E2原理图中列出的连接到40引脚接头的 SPI 连接)、从现有 RPI 接头条目中删除引脚配置、并使用正确的引脚多路复用器为 MCU_SPI1创建一个新的引脚配置。
3) 3)添加从此链接找到的相应 DMA 条目： https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j721s2/psil_cfg.html
我在 k3-psil-j721s2.c 文件中发现 Rx 条目应该是0x7200、因此我确定了相应的 Tx 条目应该是0xf200。
请注意、我已将 CONFIG_SPI_SLAVE=y、CONFIG_SPI_SPIDEV=y 和 CONFIG_SPI_OMAP24xx=y 添加到我的 KCONFIG 中、以防缺少一些内容。
下面是所有相关的修补程序,如果它有点长,道歉
1.
diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi index 3131e7b..4c7a7d5 100644 --- a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi +++ b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi @@ -433,6 +433,8 @@ interrupts = <GIC_SPI 849 IRQ_TYPE_LEVEL_HIGH>; #address-cells = <1>; #size-cells = <0>; + dmas = <&mcu_udmap 0xf200>, <&mcu_udmap 0x7200>; + dma-names = "tx0", "rx0"; power-domains = <&k3_pds 348 TI_SCI_PD_EXCLUSIVE>; clocks = <&k3_clks 348 2>; status = "disabled";
2.
diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
index 32aea58..7a8ca0d 100644
--- a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
@@ -31,6 +31,7 @@
can1 = &mcu_mcan1;
can2 = &main_mcan6;
can3 = &main_mcan7;
+ spi0 = &mcu_spi1;
ethernet0 = &cpsw_port1;
};
@@ -394,16 +395,26 @@
mcu_rpi_header_gpio0_pins0_default: mcu-rpi-header-gpio0-default-pins-0 {
pinctrl-single,pins = <
J721S2_WKUP_IOPAD(0x118, PIN_INPUT, 7) /* (G25) WKUP_GPIO0_66 */
- J721S2_WKUP_IOPAD(0x05C, PIN_INPUT, 7) /* (E24) MCU_SPI1_D0.WKUP_GPIO0_1 */
- J721S2_WKUP_IOPAD(0x060, PIN_INPUT, 7) /* (C28) MCU_SPI1_D1.WKUP_GPIO0_2 */
- J721S2_WKUP_IOPAD(0x058, PIN_INPUT, 7) /* (D26) MCU_SPI1_CLK.WKUP_GPIO0_0 */
+ /* J721S2_WKUP_IOPAD(0x05C, PIN_INPUT, 0) /* (E24) MCU_SPI1_D0.WKUP_GPIO0_1 */
+ /* J721S2_WKUP_IOPAD(0x060, PIN_INPUT, 0) /* (C28) MCU_SPI1_D1.WKUP_GPIO0_2 */
+ /* J721S2_WKUP_IOPAD(0x058, PIN_INPUT, 0) /* (D26) MCU_SPI1_CLK.WKUP_GPIO0_0 */
J721S2_WKUP_IOPAD(0x094, PIN_INPUT, 7) /* (D25) MCU_SPI1_CS2.WKUP_GPIO0_15*/
J721S2_WKUP_IOPAD(0x0B8, PIN_INPUT, 7) /* (G27) WKUP_GPIO0_56 */
J721S2_WKUP_IOPAD(0x114, PIN_INPUT, 7) /* (J26) WKUP_GPIO0_57 */
J721S2_WKUP_IOPAD(0x11C, PIN_INPUT, 7) /* (J27) WKUP_GPIO0_67 */
- J721S2_WKUP_IOPAD(0x064, PIN_INPUT, 7) /* (C27) MCU_SPI1_CS0.WKUP_GPIO0_3 */
+ /* J721S2_WKUP_IOPAD(0x064, PIN_INPUT, 0) /* (C27) MCU_SPI1_CS0.WKUP_GPIO0_3 */
>;
};
+
+ mcu_spi1_pins_default: mcu-spi1-default-pins {
+ pinctrl-single,pins = <
+ J721S2_IOPAD(0x05c, PIN_INPUT_PULLUP, 0) /* (E24) MCU_SPI1_D0 */
+ J721S2_IOPAD(0x060, PIN_INPUT_PULLUP, 0) /* (C28) MCU_SPI1_D1 */
+ J721S2_IOPAD(0x064, PIN_INPUT_PULLUP, 0) /* (C27) MCU_SPI1_CS0 */
+ J721S2_IOPAD(0x058, PIN_INPUT, 0) /* (D26) MCU_SPI1_CLK */
+ >;
+ };
+
};
&wkup_pmx3 {
@@ -508,6 +519,23 @@
};
};
+&mcu_spi1 {
+
+
+
+
+ status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&mcu_spi1_pins_default>;
+ spi-slave;
+ slave@0 {
+
+ reg = <0>;
+ spi-max-frequency = <24000000>;
+ compatible = "rohm,dh2228fv";
+ };
+};
+
3.
diff --git a/arch/arm64/boot/dts/ti/k3-j721s2.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2.dtsi index 6b36f5d..bc112e4 100644 --- a/arch/arm64/boot/dts/ti/k3-j721s2.dtsi +++ b/arch/arm64/boot/dts/ti/k3-j721s2.dtsi @@ -152,6 +152,7 @@ ranges = <0x00 0x28380000 0x00 0x28380000 0x00 0x03880000>, /* MCU NAVSS*/ <0x00 0x40200000 0x00 0x40200000 0x00 0x00998400>, /* First peripheral window */ <0x00 0x40f00000 0x00 0x40f00000 0x00 0x00020000>, /* CTRL_MMR0 */ + <0x00 0x40310000 0x00 0x40310000 0x00 0x00000400>, /* MCU SPI1 */ <0x00 0x41000000 0x00 0x41000000 0x00 0x00020000>, /* MCU R5F Core0 */ <0x00 0x41400000 0x00 0x41400000 0x00 0x00020000>, /* MCU R5F Core1 */ <0x00 0x41c00000 0x00 0x41c00000 0x00 0x00100000>, /* MCU SRAM */
4.
diff --git a/drivers/dma/ti/k3-psil-j721s2.c b/drivers/dma/ti/k3-psil-j721s2.c
index ba08bdc..be768e8 100644
--- a/drivers/dma/ti/k3-psil-j721s2.c
+++ b/drivers/dma/ti/k3-psil-j721s2.c
@@ -248,6 +248,11 @@ static struct psil_ep j721s2_dst_ep_map[] = {
/* SA2UL */
PSIL_SA2UL(0xf500, 1),
PSIL_SA2UL(0xf501, 1),
+ /* MCU_PDMA_SPI1 */
+ PSIL_PDMA_XY_PKT(0xf200),
+ PSIL_PDMA_XY_PKT(0xf201),
+ PSIL_PDMA_XY_PKT(0xf202),
+ PSIL_PDMA_XY_PKT(0xf203),
};
我一直主要使用此文档作为指南、但它没有介绍如何使用外部引脚作为输入
https://www.ti.com/lit/pdf/sprad26
KR、
Matt
