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ebc090e420
The introduction ofebf0d8dade("ath79: add new ar934x spi driver") made the SPI memory unusable on devices with very high spi-max-frequency (104 MHz). Here's how the actual clock is calculated: (AHB_CLK/((CLOCK_DIVIDER+1)*2)) where AHB_CLK is a fixed clock (e.g. 200MHz on AR9331) and CLOCK_DIVIDER is the parameter we can set. Highest clock according to this formula is AHB_CLK/2 (100MHz, but that didn't work in device tests). The next possible value is AHB_CLK/4 (50MHz). Speeds between 50 MHz and 100 MHz will be rounded down, so using values higher than 50 MHz does not provide any benefit. Consequently, this patch reduces spi-max-frequency for all devices with values higher than 50 MHz to 50 MHz (effectively, this only affects devices with 104 MHz before this patch). Tested on GL.inet GL-AR150: Boot fails with 104 MHz but is successful with both 50 MHz and 80 MHz (fast-read), where the latter two yield identical read speeds. Fixes:ebf0d8dade("ath79: add new ar934x spi driver") Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
136 lines
1.9 KiB
Plaintext
136 lines
1.9 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
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/dts-v1/;
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/input/input.h>
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#include "ar9331.dtsi"
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/ {
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model = "8devices Carambola2";
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compatible = "8dev,carambola2", "qca,ar9331";
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aliases {
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serial0 = &uart;
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label-mac-device = &wmac;
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};
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leds {
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compatible = "gpio-leds";
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wlan {
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label = "carambola2:green:wlan";
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gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
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linux,default-trigger = "phy0tpt";
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};
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eth0 {
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label = "carambola2:orange:eth0";
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gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
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};
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eth1 {
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label = "carambola2:orange:eth1";
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gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
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};
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};
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keys {
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compatible = "gpio-keys";
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wps {
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label = "wps";
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linux,code = <KEY_WPS_BUTTON>;
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gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
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};
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};
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};
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&ref {
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clock-frequency = <40000000>;
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};
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&uart {
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status = "okay";
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};
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&gpio {
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status = "okay";
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};
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&usb {
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dr_mode = "host";
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status = "okay";
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};
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&usb_phy {
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status = "okay";
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};
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&spi {
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num-chipselects = <0>;
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status = "okay";
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flash@0 {
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compatible = "jedec,spi-nor";
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spi-max-frequency = <50000000>;
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reg = <0>;
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partitions {
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compatible = "fixed-partitions";
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#address-cells = <1>;
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#size-cells = <1>;
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uboot: partition@0 {
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label = "u-boot";
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reg = <0x000000 0x040000>;
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read-only;
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};
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partition@40000 {
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label = "u-boot-env";
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reg = <0x040000 0x010000>;
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read-only;
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};
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partition@50000 {
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compatible = "denx,uimage";
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label = "firmware";
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reg = <0x50000 0xfa0000>;
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};
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art: partition@ff0000 {
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label = "art";
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reg = <0xff0000 0x010000>;
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read-only;
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};
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};
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};
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};
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&mdio0 {
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status = "okay";
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};
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ð0 {
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status = "okay";
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mtd-mac-address = <&art 0x0>;
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gmac-config {
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device = <&gmac>;
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switch-phy-addr-swap = <1>;
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switch-phy-swap = <1>;
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};
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};
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ð1 {
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status = "okay";
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mtd-mac-address = <&art 0x6>;
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};
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&wmac {
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status = "okay";
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mtd-cal-data = <&art 0x1000>;
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};
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