Declares three SPI slave devices on three different MSIOF instances:
- high-speed (30 MHz),
- medium-speed (1 MHz),
- low-speed (20 kHz).
The maximum frequencies are chosen such that the optimal parent clock
frequency for the high-speed device is outside of the allowed range for
the low-speed device.
Reorder the devices by changing the "&msiofX" references to investigate
different probe order.
Not-Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
Not intended for upstream merge.
---
arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 74 ++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
index 4ef4a712671b2579..9040a691b8b61887 100644
--- a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
+++ b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
@@ -45,6 +45,10 @@
serial2 = &scif3;
serial3 = &hscif3;
ethernet0 = &avb;
+ spi0 = &msiof0;
+ spi1 = &msiof1;
+ spi2 = &msiof2;
+ spi3 = &msiof3;
};
chosen {
@@ -182,6 +186,24 @@
function = "avb";
};
+ msiof0_pins: msiof0 {
+ groups = "msiof0_clk", "msiof0_sync", "msiof0_rxd",
+ "msiof0_txd";
+ function = "msiof0";
+ };
+
+ msiof2_pins: msiof2 {
+ groups = "msiof2_clk_b", "msiof2_sync_b", "msiof2_rxd_b",
+ "msiof2_txd_b";
+ function = "msiof2";
+ };
+
+ msiof3_pins: msiof3 {
+ groups = "msiof3_clk_a", "msiof3_sync_a", "msiof3_rxd_a",
+ "msiof3_txd_a";
+ function = "msiof3";
+ };
+
sdhi0_pins: sd0 {
groups = "sdhi0_data4", "sdhi0_ctrl";
function = "sdhi0";
@@ -455,3 +477,55 @@
&pciec1 {
status = "okay";
};
+
+/* Dummy high-speed SPI slave device */
+&msiof0 {
+ pinctrl-0 = <&msiof0_pins>;
+ pinctrl-names = "default";
+
+ status = "okay";
+
+ flash@0 {
+ compatible = "jedec,spi-nor";
+ //compatible = "spidev";
+ reg = <0>;
+
+ spi-max-frequency = <30000000>;
+ };
+};
+
+/* Dummy medium-speed SPI slave device */
+&msiof2 {
+ pinctrl-0 = <&msiof2_pins>;
+ pinctrl-names = "default";
+
+ status = "okay";
+
+ spidev@0 {
+ //compatible = "jedec,spi-nor";
+ compatible = "spidev";
+ reg = <0>;
+
+ spi-max-frequency = <1000000>;
+ };
+};
+
+/* Dummy low-speed SPI slave device */
+&msiof3 {
+ pinctrl-0 = <&msiof3_pins>;
+ pinctrl-names = "default";
+
+ status = "okay";
+
+ gpio@0 {
+ compatible = "fairchild,74hc595";
+ //compatible = "jedec,spi-nor";
+ //compatible = "spidev";
+ reg = <0>;
+
+ gpio-controller;
+ #gpio-cells = <2>;
+ registers-number = <2>;
+ spi-max-frequency = <20000>;
+ };
+};
--
1.9.1
