[PATCH 3/3] ARM: dts: at91: sam9x60: Add spi0 node (flexcom 0)

[Alexander Dahl]

Hello Eugen,

Am Tue, Nov 11, 2025 at 01:34:35PM +0200 schrieb Eugen Hristev:
> 
> 
> On 11/11/25 13:26, Alexander Dahl wrote:
> > Copied from linux kernel v6.18-rc4.  Stripped attributes not supported
> > by U-Boot drivers (dma, interrupt, fifo-size).
> 
> Hello Alexander,
> 
> Have you tried to configure the build to use upstream DTS ? this should
> be available in the U-boot dir. CONFIG_OF_UPSTREAM I believe.

Quick try with _just_ enabling CONFIG_OF_UPSTREAM and adding the
obligatory folder to CONFIG_DEFAULT_DEVICE_TREE leads to the expected
build errors:

  DTC     dts/upstream/src/arm/microchip/at91-sam9x60_curiosity.dtb
Error: …/u-boot/arch/arm/dts/at91-sam9x60_curiosity-u-boot.dtsi:43.1-7 Label or path clk32 not found
Error: …/u-boot/arch/arm/dts/at91-sam9x60_curiosity-u-boot.dtsi:51.1-9 Label or path main_rc not found
Error: …/u-boot/arch/arm/dts/at91-sam9x60_curiosity-u-boot.dtsi:67.1-16 Label or path pinctrl_sdhci0 not found
Error: …/u-boot/arch/arm/dts/at91-sam9x60_curiosity-u-boot.dtsi:79.1-9 Label or path pit64b0 not found
Error: …/u-boot/arch/arm/dts/at91-sam9x60_curiosity-u-boot.dtsi:87.1-8 Label or path sdhci0 not found
Error: …/u-boot/arch/arm/dts/at91-sam9x60_curiosity-u-boot.dtsi:91.1-13 Label or path slow_rc_osc not found
FATAL ERROR: Syntax error parsing input tree

Not bad for the first shot, but I guess at least the clock related
issues might get challenging.  However I need to put this aside for later.

One question though, while we are at it:  Would it be possible to
define a custom dts in U-Boot and include an upstream .dtsi?

Greets
Alex

> 
> Also, if you really want to update this u-boot DT, you would have to
> copy it as-is, no stripping. Even if the props are unused. The only real
> issue would be if Uboot stops working or gets confused by these extra props
> 
> Eugen>
> > Signed-off-by: Alexander Dahl <ada at thorsis.com>
> > ---
> >  arch/arm/dts/sam9x60.dtsi | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/arch/arm/dts/sam9x60.dtsi b/arch/arm/dts/sam9x60.dtsi
> > index a33c0d57398..1ee30422518 100644
> > --- a/arch/arm/dts/sam9x60.dtsi
> > +++ b/arch/arm/dts/sam9x60.dtsi
> > @@ -182,6 +182,16 @@
> >  				ranges = <0x0 0xf801c000 0x800>;
> >  				status = "disabled";
> >  
> > +				spi0: spi at 400 {
> > +					compatible = "microchip,sam9x60-spi", "atmel,at91rm9200-spi";
> > +					reg = <0x400 0x200>;
> > +					#address-cells = <1>;
> > +					#size-cells = <0>;
> > +					clocks = <&pmc PMC_TYPE_PERIPHERAL 5>;
> > +					clock-names = "spi_clk";
> > +					status = "disabled";
> > +				};
> > +
> >  				i2c0: i2c at 600 {
> >  					compatible = "microchip,sam9x60-i2c";
> >  					reg = <0x600 0x200>;
> 

-- 
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