Re: [PATCH] ARM: dts: dra7: Support QSPI MODE-0 operation at 64MHz
From: Tony Lindgren <hidden>
Date: 2016-02-26 19:13:48
Also in:
linux-arm-kernel, linux-omap, lkml
Hi, * Vignesh R [off-list ref] [160224 20:49]:
quoted hunk ↗ jump to hunk
According to Data Manual(SPRS915P) of AM57x, TI QSPI controller on DRA74(rev 1.1+) can support up to 64MHz in MODE-0, whereas MODE-3 is limited to 48MHz. Hence, switch to MODE-0 for better throughput. Signed-off-by: Vignesh R <redacted> --- arch/arm/boot/dts/dra7-evm.dts | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts index cfc24e52244e..15f10bdc8c31 100644 --- a/arch/arm/boot/dts/dra7-evm.dts +++ b/arch/arm/boot/dts/dra7-evm.dts@@ -653,15 +653,13 @@ pinctrl-names = "default"; pinctrl-0 = <&qspi1_pins>; - spi-max-frequency = <48000000>; + spi-max-frequency = <64000000>; m25p80@0 { compatible = "s25fl256s1"; - spi-max-frequency = <48000000>; + spi-max-frequency = <64000000>; reg = <0>; spi-tx-bus-width = <1>; spi-rx-bus-width = <4>; - spi-cpol; - spi-cpha; #address-cells = <1>; #size-cells = <1>;
Do we have any earlier pre DRA74(rev 1.1)versions in use too? What about the spi-cpol and spi-cpha changes? Those should be at least documented? Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html