Re: [PATCH 2/3] arm64: dts: ti: am654-base-board: add ICSSG2 Ethernet support
From: Andrew Davis
Date: Fri Sep 15 2023 - 12:07:41 EST
On 9/13/23 1:05 AM, MD Danish Anwar wrote:
On 12/09/23 20:28, Andrew Davis wrote:
On 9/12/23 3:29 AM, MD Danish Anwar wrote:
Hi Andrew,
On 11/09/23 18:35, Andrew Davis wrote:
On 9/11/23 2:12 AM, MD Danish Anwar wrote:
ICSSG2 provides dual Gigabit Ethernet support.
For support SR2.0 ICSSG Ethernet firmware:
- provide different firmware blobs and use TX_PRU.
- IEP0 is used as PTP Hardware Clock and can only be used for one port.
- TX timestamp notification comes via INTC interrupt.
Signed-off-by: MD Danish Anwar <danishanwar@xxxxxx>
---
.../arm64/boot/dts/ti/k3-am654-base-board.dts | 123
++++++++++++++++++
Adding this to the base dts? What if I want to use my PRUs for something
else? These "application nodes" define a single usecase out of many
possible, and should IMHO always be in overlays so users can select
which
they want easily.
The base board (AM654x-EVM) has two Ethernet ports dedicated for ICSSG.
The expectation is that when a user boots up AM654x-EVM, ICSSG is
supported on those two ports by default. If the icssg nodes are not
added to base dts then by default the two Ethernet ports will have no
functionality.
This is *your* default use-case for these PRUs, mine might be different.
I can agree that most might want this use-case too and this is the one
intended as the demo for these ports on this board. What I am saying is
that when one wants to use these PRUs for something else, having this
one application baked into the base DTB makes it very difficult to switch.
This is the intended use case. The base board has two ICSSG Ethernet
ports. My understanding is that device trees describe the hardware.
Correct, but you are not describing hardware here, you are describing
software. Yes it is software that uses hardware so you are listing a
bunch of hardware too, but the core is a firmware.
The base board dts should describe the base board hardware which has the
two ICSSG ports. So the base board dts should contain nodes to enable
those two ports.
Any hardware component that is not present in the base board should be
applied as an overlay.
Correct again, the firmware is not baked into the base board, that is
loaded by U-Boot/Linux at runtime and can be selected.
For example in the AM654x-IDK, we have extra IDK card applied on the
base board. This IDK card contains 4 ICSSG Ethernet ports. The nodes for
these 4 ICSSG port should go in an overlay i.e. k3-am654-idk.dtso which
I am doing as part of the patch 3 of this series.
My understanding is that any hardware component that is part of the base
board should be described in base-board.dts. Any hardware component that
is not part of the base board and is added by extra cards should be
described in overlays.
The primary use case is that ICSSG should support on those two ports in
AM654x-EVM by default. The user should not need to apply any overlay to
get the two ports working. So In order to achieve that I think it is OK
to add the ICSSG nodes in the base board dts file.
A user does not need to apply an overlay to use these, this application
node overlay can be applied at build time. You can even rename the base
.dtb to be the one that has this overlay applied by default.
Take a look at k3-am654-gp-evm.dtb, it is a composite DTB built from
the "base-board" DTB and the "rocktech-rk101-panel" DTBO applied on top.
This combination is what we call and sell as the "GP EVM", and you
can use it by booting the "k3-am654-gp-evm.dtb". Now let's say you
want to use a different panel, all you need to do is take the base-
board and apply a different panel overlay. Had we hard-coded the
"default" panel into the base-board DTS then a user with a different
panel would have to go and edit the DTS to remove all the rk101-panel
bits.
This is one way to do it. But I still think the best way to do this is
to have the ICSSG nodes in base board dts as the ICSSG hardware is
present on the base board.
So again, you are not describing the hardware, you are describing a
*use of* the hardware. This node describes what firmware to load and
what bits of hardware that firmware should use to get some end result,
but I could just as easily use a different firmware and give it different
links to different hardware bits and make it into something else. No
physical changes to the hardware needed.
If user wants to use PRUs for something else, we can have overlay for
those. But we should not need to apply any overlay to achieve the
primary functionality i.e. ICSSG working in the two dedicated ICSSG
Ethernet ports.
They could *not* simply add a different overlay for their usecase as
you have baked your usecase into the base DTB. Their overlay would
have to have a bunch of /delete-node/ junk to remove your "defaults".
This patch adds one node "icssg2-eth" which uses six PRUs. If user wants
to use PRUs for something else they can add "/delete-node/ &icssg2_eth"
in the overlay.
/delete-node/ is usually an indication some layering was done wrong,
it shouldn't be needed in most cases to delete nodes. And that is
my point here, I don't want to have to delete your use-case in
every overlay file that uses the PRUs differently than you. Your
use-case should simply be an overlay too, then all I have to do is
apply my overlay instead of yours without deletes.
Andrew
As above, if this is the "primary functionality" then have this
overlay applied by default:
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -42,7 +42,7 @@ dtb-$(CONFIG_ARCH_K3) +=
k3-am642-tqma64xxl-mbax4xxl-sdcard.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl-wlan.dtb
# Boards with AM65x SoC
-k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb
k3-am654-base-board-rocktech-rk101-panel.dtbo
+k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb
k3-am654-base-board-rocktech-rk101-panel.dtbo
k3-am654-base-board-prueth.dtbo
dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic-pg2.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced.dtb
Andrew
Andrew
1 file changed, 123 insertions(+)
diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
index f5c26e9fba98..5cf9546ff9f7 100644
--- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
@@ -25,6 +25,8 @@ aliases {
ethernet0 = &cpsw_port1;
mmc0 = &sdhci0;
mmc1 = &sdhci1;
+ ethernet1 = &icssg2_emac0;
+ ethernet2 = &icssg2_emac1;
};
chosen {
@@ -144,6 +146,72 @@ vtt_supply: regulator-3 {
vin-supply = <&vcc3v3_io>;
gpio = <&wkup_gpio0 28 GPIO_ACTIVE_HIGH>;
};
+
+ /* Dual Ethernet application node on PRU-ICSSG2 */
+ icssg2_eth: icssg2-eth {
+ compatible = "ti,am654-icssg-prueth";
+ pinctrl-names = "default";
+ pinctrl-0 = <&icssg2_rgmii_pins_default>;
+ sram = <&msmc_ram>;
+ ti,prus = <&pru2_0>, <&rtu2_0>, <&tx_pru2_0>,
+ <&pru2_1>, <&rtu2_1>, <&tx_pru2_1>;
+ firmware-name = "ti-pruss/am65x-sr2-pru0-prueth-fw.elf",
+ "ti-pruss/am65x-sr2-rtu0-prueth-fw.elf",
+ "ti-pruss/am65x-sr2-txpru0-prueth-fw.elf",
+ "ti-pruss/am65x-sr2-pru1-prueth-fw.elf",
+ "ti-pruss/am65x-sr2-rtu1-prueth-fw.elf",
+ "ti-pruss/am65x-sr2-txpru1-prueth-fw.elf";
+
+ ti,pruss-gp-mux-sel = <2>, /* MII mode */
+ <2>,
+ <2>,
+ <2>, /* MII mode */
+ <2>,
+ <2>;
+
+ ti,mii-g-rt = <&icssg2_mii_g_rt>;
+ ti,mii-rt = <&icssg2_mii_rt>;
+ ti,iep = <&icssg2_iep0>, <&icssg2_iep1>;
+
+ interrupt-parent = <&icssg2_intc>;
+ interrupts = <24 0 2>, <25 1 3>;
+ interrupt-names = "tx_ts0", "tx_ts1";
+
+ dmas = <&main_udmap 0xc300>, /* egress slice 0 */
+ <&main_udmap 0xc301>, /* egress slice 0 */
+ <&main_udmap 0xc302>, /* egress slice 0 */
+ <&main_udmap 0xc303>, /* egress slice 0 */
+ <&main_udmap 0xc304>, /* egress slice 1 */
+ <&main_udmap 0xc305>, /* egress slice 1 */
+ <&main_udmap 0xc306>, /* egress slice 1 */
+ <&main_udmap 0xc307>, /* egress slice 1 */
+ <&main_udmap 0x4300>, /* ingress slice 0 */
+ <&main_udmap 0x4301>; /* ingress slice 1 */
+
+ dma-names = "tx0-0", "tx0-1", "tx0-2", "tx0-3",
+ "tx1-0", "tx1-1", "tx1-2", "tx1-3",
+ "rx0", "rx1";
+ ethernet-ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ icssg2_emac0: port@0 {
+ reg = <0>;
+ phy-handle = <&icssg2_phy0>;
+ phy-mode = "rgmii-id";
+ ti,syscon-rgmii-delay = <&scm_conf 0x4120>;
+ /* Filled in by bootloader */
+ local-mac-address = [00 00 00 00 00 00];
+ };
+ icssg2_emac1: port@1 {
+ reg = <1>;
+ phy-handle = <&icssg2_phy1>;
+ phy-mode = "rgmii-id";
+ ti,syscon-rgmii-delay = <&scm_conf 0x4124>;
+ /* Filled in by bootloader */
+ local-mac-address = [00 00 00 00 00 00];
+ };
+ };
+ };
};
&wkup_pmx0 {
@@ -300,6 +368,43 @@ usb1_pins_default: usb1-default-pins {
AM65X_IOPAD(0x02c0, PIN_OUTPUT, 0) /* (AC8)
USB1_DRVVBUS */
>;
};
+
+ icssg2_mdio_pins_default: icssg2-mdio-default-pins {
+ pinctrl-single,pins = <
+ AM65X_IOPAD(0x0094, PIN_INPUT, 2) /* (AC19)
PRG2_PRU0_GPO7.PRG2_MDIO0_MDIO */
+ AM65X_IOPAD(0x00c8, PIN_OUTPUT, 2) /* (AE15)
PRG2_PRU1_GPO7.PRG2_MDIO0_MDC */
+ >;
+ };
+
+ icssg2_rgmii_pins_default: icssg2-rgmii-default-pins {
+ pinctrl-single,pins = <
+ AM65X_IOPAD(0x00ac, PIN_INPUT, 2) /* (AH15)
PRG2_PRU1_GPO0.PRG2_RGMII2_RD0 */
+ AM65X_IOPAD(0x00b0, PIN_INPUT, 2) /* (AC16)
PRG2_PRU1_GPO1.PRG2_RGMII2_RD1 */
+ AM65X_IOPAD(0x00b4, PIN_INPUT, 2) /* (AD17)
PRG2_PRU1_GPO2.PRG2_RGMII2_RD2 */
+ AM65X_IOPAD(0x00b8, PIN_INPUT, 2) /* (AH14)
PRG2_PRU1_GPO3.PRG2_RGMII2_RD3 */
+ AM65X_IOPAD(0x00cc, PIN_OUTPUT, 2) /* (AD15)
PRG2_PRU1_GPO8.PRG2_RGMII2_TD0 */
+ AM65X_IOPAD(0x00d0, PIN_OUTPUT, 2) /* (AF14)
PRG2_PRU1_GPO9.PRG2_RGMII2_TD1 */
+ AM65X_IOPAD(0x00d4, PIN_OUTPUT, 2) /* (AC15)
PRG2_PRU1_GPO10.PRG2_RGMII2_TD2 */
+ AM65X_IOPAD(0x00d8, PIN_OUTPUT, 2) /* (AD14)
PRG2_PRU1_GPO11.PRG2_RGMII2_TD3 */
+ AM65X_IOPAD(0x00dc, PIN_INPUT, 2) /* (AE14)
PRG2_PRU1_GPO16.PRG2_RGMII2_TXC */
+ AM65X_IOPAD(0x00c4, PIN_OUTPUT, 2) /* (AC17)
PRG2_PRU1_GPO6.PRG2_RGMII2_TX_CTL */
+ AM65X_IOPAD(0x00c0, PIN_INPUT, 2) /* (AG15)
PRG2_PRU1_GPO5.PRG2_RGMII2_RXC */
+ AM65X_IOPAD(0x00bc, PIN_INPUT, 2) /* (AG14)
PRG2_PRU1_GPO4.PRG2_RGMII2_RX_CTL */
+
+ AM65X_IOPAD(0x0078, PIN_INPUT, 2) /* (AF18)
PRG2_PRU0_GPO0.PRG2_RGMII1_RD0 */
+ AM65X_IOPAD(0x007c, PIN_INPUT, 2) /* (AE18)
PRG2_PRU0_GPO1.PRG2_RGMII1_RD1 */
+ AM65X_IOPAD(0x0080, PIN_INPUT, 2) /* (AH17)
PRG2_PRU0_GPO2.PRG2_RGMII1_RD2 */
+ AM65X_IOPAD(0x0084, PIN_INPUT, 2) /* (AG18)
PRG2_PRU0_GPO3.PRG2_RGMII1_RD3 */
+ AM65X_IOPAD(0x0098, PIN_OUTPUT, 2) /* (AH16)
PRG2_PRU0_GPO8.PRG2_RGMII1_TD0 */
+ AM65X_IOPAD(0x009c, PIN_OUTPUT, 2) /* (AG16)
PRG2_PRU0_GPO9.PRG2_RGMII1_TD1 */
+ AM65X_IOPAD(0x00a0, PIN_OUTPUT, 2) /* (AF16)
PRG2_PRU0_GPO10.PRG2_RGMII1_TD2 */
+ AM65X_IOPAD(0x00a4, PIN_OUTPUT, 2) /* (AE16)
PRG2_PRU0_GPO11.PRG2_RGMII1_TD3 */
+ AM65X_IOPAD(0x00a8, PIN_INPUT, 2) /* (AD16)
PRG2_PRU0_GPO16.PRG2_RGMII1_TXC */
+ AM65X_IOPAD(0x0090, PIN_OUTPUT, 2) /* (AE17)
PRG2_PRU0_GPO6.PRG2_RGMII1_TX_CTL */
+ AM65X_IOPAD(0x008c, PIN_INPUT, 2) /* (AF17)
PRG2_PRU0_GPO5.PRG2_RGMII1_RXC */
+ AM65X_IOPAD(0x0088, PIN_INPUT, 2) /* (AG17)
PRG2_PRU0_GPO4.PRG2_RGMII1_RX_CTL */
+ >;
+ };
};
&main_pmx1 {
@@ -621,3 +726,21 @@ &cpsw_port1 {
&dss {
status = "disabled";
};
+
+&icssg2_mdio {
+ status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&icssg2_mdio_pins_default>;
+
+ icssg2_phy0: ethernet-phy@0 {
+ reg = <0>;
+ ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
+ ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
+ };
+
+ icssg2_phy1: ethernet-phy@3 {
+ reg = <3>;
+ ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
+ ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
+ };
+};