ARM: dts: imx6ull-tarragon: Reduce SPI clock for QCA7000

Our hardware department recently informed us that, according to
the specification, the QCA7000 should be operated with a
maximum SPI clock frequency of 12 MHz. Even if it appears to work
at a higher frequency, we should not take any risks here. A short
performance test showed no measurable loss of speed.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts
index 67007ce383e3caf21438bb6fbdfbec2f3bb719b3..f9bbd589b66da8e2900d41920b014fad115688f6 100644 (file)
--- a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-master.dts
@@ -45,7 +45,7 @@
                interrupts = <19 IRQ_TYPE_EDGE_RISING>;
                spi-cpha;
                spi-cpol;
-               spi-max-frequency = <16000000>;
+               spi-max-frequency = <12000000>;
        };
 };
 
@@ -63,7 +63,7 @@
                interrupts = <9 IRQ_TYPE_EDGE_RISING>;
                spi-cpha;
                spi-cpol;
-               spi-max-frequency = <16000000>;
+               spi-max-frequency = <12000000>;
        };
 };
 

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts
index cee223b5f8e1cf087b7508c8a769907a020147cb..ef06619d7c867c70ee0cdc732c687764d90de18d 100644 (file)
--- a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slave.dts
@@ -23,7 +23,7 @@
                interrupts = <19 IRQ_TYPE_EDGE_RISING>;
                spi-cpha;
                spi-cpol;
-               spi-max-frequency = <16000000>;
+               spi-max-frequency = <12000000>;
        };
 };
 

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts
index 7fd53b7a4372329e23bbd94de0bdc23c99f5df1f..83db65bf630fc9b6fc9f4075773fc91599f3eb1a 100644 (file)
--- a/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ull-tarragon-slavext.dts
@@ -45,7 +45,7 @@
                interrupts = <19 IRQ_TYPE_EDGE_RISING>;
                spi-cpha;
                spi-cpol;
-               spi-max-frequency = <16000000>;
+               spi-max-frequency = <12000000>;
        };
 };