[PATCH 17/18] riscv: defconfig: enable A210 support

[Han Gao]

On Thu, 22 Oct 2026 19:50:51 +0100 Conor Dooley <conor at kernel.org> wrote:

> On Thu, Oct 22, 2026 at 03:53:37AM +0800, Han Gao via B4 Relay wrote:
> > From: Han Gao <gaohan at iscas.ac.cn>
> > 
> > Enable A210 platform drivers and reserve ten 8250 UART ports.
> > 
> > Signed-off-by: Han Gao <gaohan at iscas.ac.cn>
> > ---
> >  arch/riscv/configs/defconfig | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
> > index 04ae305d5511..b9b3bca12089 100644
> > --- a/arch/riscv/configs/defconfig
> > +++ b/arch/riscv/configs/defconfig
> > @@ -33,6 +33,7 @@ CONFIG_SOC_STARFIVE=y
> >  CONFIG_ARCH_SUNXI=y
> >  CONFIG_ARCH_TENSTORRENT=y
> >  CONFIG_ARCH_THEAD=y
> > +CONFIG_ARCH_ZHIHE=y
> >  CONFIG_ARCH_ULTRARISC=y
> >  CONFIG_ARCH_VIRT=y
> >  CONFIG_ARCH_CANAAN=y
> > @@ -149,6 +150,8 @@ CONFIG_KEYBOARD_GPIO=y
> >  CONFIG_KEYBOARD_SUN4I_LRADC=m
> >  CONFIG_SERIAL_8250=y
> >  CONFIG_SERIAL_8250_CONSOLE=y
> > +CONFIG_SERIAL_8250_NR_UARTS=10
> > +CONFIG_SERIAL_8250_RUNTIME_UARTS=10
> 
> Why are these options needed?

The A210 has 10 UARTs and the TH1520 has 6. With the default of 4,
UARTs beyond the 4th don't get a fixed ttyS index and end up in
whatever slot is free. Raising both to 10 keeps the index stable.

> 
> >  CONFIG_SERIAL_8250_DW=y
> >  CONFIG_SERIAL_OF_PLATFORM=y
> >  CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
> > @@ -167,6 +170,7 @@ CONFIG_SPI_PL022=m
> >  CONFIG_SPI_SIFIVE=y
> >  CONFIG_SPI_SUN6I=y
> >  # CONFIG_PTP_1588_CLOCK is not set
> > +CONFIG_PINCTRL_A210=y
> >  CONFIG_PINCTRL_TH1520=y
> >  CONFIG_PINCTRL_SOPHGO_CV1800B=y
> >  CONFIG_PINCTRL_SOPHGO_CV1812H=y
> > 
> > -- 
> > 2.55.0
> > 
> > 
> 

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