Am Freitag, dem 15.12.2023 um 19:20 +0100 schrieb Dragan Simic: > On 2023-12-15 19:15, Dragan Simic wrote: > > On 2023-12-15 13:28, Stefan Nagy wrote: > > > The ROCK Pi 4A/B/C boards come with a 32 Mbit SPI NOR flash chip > > > (XTX Technology Limited XT25F32) which has a maximum clock > > > frequency of 108 MHz. However, the Rockchip SPI controller driver > > > limits the maximum SPI clock frequency to 50 MHz. Use this limit > > > for spi-max-freq. > > > > > > This patch has been tested on ROCK Pi 4A. > > > > > > Signed-off-by: Stefan Nagy <stefan.nagy@xxxxxxxxxxxxx> > > > --- > > > arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts | 2 +- > > > arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts | 2 +- > > > arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts | 2 +- > > > 3 files changed, 3 insertions(+), 3 deletions(-) > > > > > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts > > > b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts > > > index d5df8939a..30e63e62a 100644 > > > --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts > > > +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts > > > @@ -19,6 +19,6 @@ &spi1 { > > > flash@0 { > > > compatible = "jedec,spi-nor"; > > > reg = <0>; > > > - spi-max-frequency = <10000000>; > > > + spi-max-frequency = <50000000>; > > > }; > > > }; > > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts > > > b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts > > > index bee6d7588..7122bf6c0 100644 > > > --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts > > > +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts > > > @@ -37,7 +37,7 @@ &spi1 { > > > flash@0 { > > > compatible = "jedec,spi-nor"; > > > reg = <0>; > > > - spi-max-frequency = <10000000>; > > > + spi-max-frequency = <50000000>; > > > }; > > > }; > > > > > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts > > > b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts > > > index de2ebe4cb..8af75bc7c 100644 > > > --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts > > > +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts > > > @@ -49,7 +49,7 @@ &spi1 { > > > flash@0 { > > > compatible = "jedec,spi-nor"; > > > reg = <0>; > > > - spi-max-frequency = <10000000>; > > > + spi-max-frequency = <50000000>; > > > }; > > > }; > > > > It would be better to upstream these changes to the Linux kernel > > first, and then sync them back to U-Boot. > > Oops, my bad, sorry, I got confused with your other patch on the U- > Boot mailing list. > > Regarding the new spi-max-frequency value, it should be better to > have it set to what the SPI chip actually supports, and let the SPI > driver do its thing. OK, I agree. I'll send a v2 of this patch with a new spi-max-frequency of 108 MHz.