The MT7621 documentation says that the sys clock - also known
as OCP clock for the Open Core Protocol - can be configured to
1/3 or 1/4 of the CPU clock.
Testing on my hardware, using the fact that the SPI clock is
based on the OCP clock and measuring transfer rates, shows
a clock of a little over 200MHz with a CPU clock of 900MHz.
So assume 1/4 is the default.
Also, the nor-flash in the gbpc1 is documented as accepting 50MHz
for request requests, and higher for other requests. So set
maximum to 50MHz.
Signed-off-by: NeilBrown <neil@xxxxxxxxxx>
---
drivers/staging/mt7621-dts/gbpc1.dts | 5 +++--
drivers/staging/mt7621-dts/mt7621.dtsi | 4 ++--
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/mt7621-dts/gbpc1.dts b/drivers/staging/mt7621-dts/gbpc1.dts
index 6b13d85d9d34..47bcee51e016 100644
--- a/drivers/staging/mt7621-dts/gbpc1.dts
+++ b/drivers/staging/mt7621-dts/gbpc1.dts
@@ -74,7 +74,7 @@
#size-cells = <1>;
compatible = "jedec,spi-nor";
reg = <0>;
- spi-max-frequency = <10000000>;
+ spi-max-frequency = <50000000>;
partition@0 {
label = "u-boot";
@@ -104,7 +104,8 @@
&sysclock {
compatible = "fixed-clock";
- clock-frequency = <90000000>;
+ /* This is normally 1/4 of cpuclock */
+ clock-frequency = <225000000>;
};
&cpuclock {
diff --git a/drivers/staging/mt7621-dts/mt7621.dtsi b/drivers/staging/mt7621-dts/mt7621.dtsi
index eb3966b7f033..4a58e94c2060 100644
--- a/drivers/staging/mt7621-dts/mt7621.dtsi
+++ b/drivers/staging/mt7621-dts/mt7621.dtsi
@@ -38,8 +38,8 @@
#clock-cells = <0>;
compatible = "fixed-clock";
- /* FIXME: there should be way to detect this */
- clock-frequency = <50000000>;
+ /* This is normally 1/4 of cpuclock */
+ clock-frequency = <220000000>;
};
palmbus: palmbus@1E000000 {
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