[PATCH v3 0/3] Add the dwmac driver support for T-HEAD TH1520 SoC

From: Drew Fustini
Date: Tue Oct 01 2024 - 02:23:54 EST


This series is based on 6.12-rc1 and depends on this pinctrl series:

20240930-th1520-pinctrl-v3-0-32cea2bdbecb@xxxxxxxxxxxxxxx

I have a branch with this series and the dependencies:

https://github.com/pdp7/linux/tree/b4/th1520-dwmac

Regarding clocks, the gmac nodes in th1520.dtsi have the "stmmac_clk"
clock set to CLK_GMAC_AXI in the AP_SUBSYS clock controller. This
corresponds to the enable bit for the GMAC axi4_clk gate which is
handled by the clk-th1520-ap driver. thead_dwmac_fix_speed() does not
modify anything in the AP_SUBSYS clock controller. It only writes to
GMAC APB registers. It seems unnecessary to create a new clock driver
just for the GMAC APB registers. Refer to section 1.6.2 in the TH1520
Peripheral Interface User Manual [1].

I've removed the properties that I added in v2: thead,rx-internal-delay
and thead,tx-internal-delay. The units for the delay field in the rgmii
delay control registers are not documented. Andrew Lunn suggested I
just hard code the delay field to 0 since I don't know the units and
the boards work with the hardware reset value of 0.

[1] https://git.beagleboard.org/beaglev-ahead/beaglev-ahead/-/tree/main/docs

Changes in v3:
- Rebase on v6.12-rc1
- Remove thead,rx-internal-delay and thead,tx-internal-delay properties
- Remove unneeded call to thead_dwmac_fix_speed() during probe
- Fix filename for the yaml file in MAINTAINERS patch

Changes in v2:
- Drop the first patch as it is no longer needed due to upstream commit
d01e0e98de31 ("dt-bindings: net: dwmac: Validate PBL for all IP-cores")
- Rename compatible from "thead,th1520-dwmac" to "thead,th1520-gmac"
- Add thead,rx-internal-delay and thead,tx-internal-delay properties
and check that it does not exceed the maximum value
- Convert from stmmac_dvr_probe() to devm_stmmac_pltfr_probe() and
delete the .remove_new hook as it is no longer needed
- Handle return value of regmap_write() in case it fails
- Add phy reset delay properties to the BeagleV Ahead device tree
- Link: https://lore.kernel.org/linux-riscv/20240926-th1520-dwmac-v2-0-f34f28ad1dc9@xxxxxxxxxxxxxxx/

Changes in v1:
- remove thead,gmacapb that references syscon for APB registers
- add a second memory region to gmac nodes for the APB registers
- Link: https://lore.kernel.org/all/20240713-thead-dwmac-v1-0-81f04480cd31@xxxxxxxxxxxxxxx/

---
Emil Renner Berthing (1):
riscv: dts: thead: Add TH1520 ethernet nodes

Jisheng Zhang (2):
dt-bindings: net: Add T-HEAD dwmac support
net: stmmac: Add glue layer for T-HEAD TH1520 SoC

.../devicetree/bindings/net/snps,dwmac.yaml | 1 +
.../devicetree/bindings/net/thead,th1520-gmac.yaml | 97 +++++++
MAINTAINERS | 2 +
arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts | 91 +++++++
.../boot/dts/thead/th1520-lichee-module-4a.dtsi | 129 +++++++++
arch/riscv/boot/dts/thead/th1520.dtsi | 50 ++++
drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c | 291 +++++++++++++++++++++
9 files changed, 673 insertions(+)
---
base-commit: 6b16e599500bd0002164d9edcb8bf7652d9888fa
change-id: 20240930-th1520-dwmac-34f5dd0cccf8

Best regards,
--
Drew Fustini <dfustini@xxxxxxxxxxxxxxx>