diff mbox series

ARM: dts: renesas: r7s72100: Add DMA support to RSPI

Message ID dfafc16b840630f20e75292d419479294558e173.1732098491.git.geert+renesas@glider.be (mailing list archive)
State New
Delegated to: Geert Uytterhoeven
Headers show
Series ARM: dts: renesas: r7s72100: Add DMA support to RSPI | expand

Commit Message

Geert Uytterhoeven Nov. 20, 2024, 10:30 a.m. UTC 
Add DMA properties to the device nodes for Renesas Serial Peripheral
Interfaces.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
To be queued in renesas-devel for v6.14.

Tested on RSK+RZA1 with Renesas YRSK-LCD-PMOD (Okaya 1.44" 128x128 Color
TFT LCD) expansion on PMOD2, using r7s72100-rskrza1-pmod-spi.dtso and
r7s72100-rskrza1-pmod2-lcd.dtso from my renesas-overlays branch[1].

Without DMA:
  - Screen refresh is visible and takes ca. 1s,
  - "modetest -s" causes 163930 interrupts,
  - workqueue: drm_fb_helper_damage_work hogged CPU for >50000us 19
    times, consider switching to WQ_UNBOUND.

With DMA:
  - Screen refresh is instantaneous,
  - "modetest -s" causes 100 RSPI and 14 DMAC interrupts.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git/log/?h=topic/renesas-overlays
---
 arch/arm/boot/dts/renesas/r7s72100.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/renesas/r7s72100.dtsi b/arch/arm/boot/dts/renesas/r7s72100.dtsi
index b831bbc431efb93e..1a866dbaf5e93423 100644
--- a/arch/arm/boot/dts/renesas/r7s72100.dtsi
+++ b/arch/arm/boot/dts/renesas/r7s72100.dtsi
@@ -238,6 +238,8 @@  spi0: spi@e800c800 {
 				     <GIC_SPI 240 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "error", "rx", "tx";
 			clocks = <&mstp10_clks R7S72100_CLK_SPI0>;
+			dmas = <&dmac 0x2d21>, <&dmac 0x2d22>;
+			dma-names = "tx", "rx";
 			power-domains = <&cpg_clocks>;
 			num-cs = <1>;
 			#address-cells = <1>;
@@ -253,6 +255,8 @@  spi1: spi@e800d000 {
 				     <GIC_SPI 243 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "error", "rx", "tx";
 			clocks = <&mstp10_clks R7S72100_CLK_SPI1>;
+			dmas = <&dmac 0x2d25>, <&dmac 0x2d26>;
+			dma-names = "tx", "rx";
 			power-domains = <&cpg_clocks>;
 			num-cs = <1>;
 			#address-cells = <1>;
@@ -268,6 +272,8 @@  spi2: spi@e800d800 {
 				     <GIC_SPI 246 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "error", "rx", "tx";
 			clocks = <&mstp10_clks R7S72100_CLK_SPI2>;
+			dmas = <&dmac 0x2d29>, <&dmac 0x2d2a>;
+			dma-names = "tx", "rx";
 			power-domains = <&cpg_clocks>;
 			num-cs = <1>;
 			#address-cells = <1>;
@@ -283,6 +289,8 @@  spi3: spi@e800e000 {
 				     <GIC_SPI 249 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "error", "rx", "tx";
 			clocks = <&mstp10_clks R7S72100_CLK_SPI3>;
+			dmas = <&dmac 0x2d2d>, <&dmac 0x2d2e>;
+			dma-names = "tx", "rx";
 			power-domains = <&cpg_clocks>;
 			num-cs = <1>;
 			#address-cells = <1>;
@@ -298,6 +306,8 @@  spi4: spi@e800e800 {
 				     <GIC_SPI 252 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "error", "rx", "tx";
 			clocks = <&mstp10_clks R7S72100_CLK_SPI4>;
+			dmas = <&dmac 0x2d31>, <&dmac 0x2d32>;
+			dma-names = "tx", "rx";
 			power-domains = <&cpg_clocks>;
 			num-cs = <1>;
 			#address-cells = <1>;