The ethernet works in kernel only if we use some binary u-boot from the
past which have support for KS8851.
The u-boot sources are not available for this mysterious u-boot image
people tends to hold on... Mainline u-bott does not have ethernet support
for sdp4430 and if we use that the ethernet is not working.
After some debugging I have managed to get the ethernet working with
mainline u-boot while not breaking the networking with the case when we
boot with the mysterious binary u-boot.
Basically we were missing bunch of pinmux settings and the 'magic'
gpio_138 handling in kernel.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
arch/arm/boot/dts/omap4-sdp.dts | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/arch/arm/boot/dts/omap4-sdp.dts b/arch/arm/boot/dts/omap4-sdp.dts
index 9dc7ec7655cb..c88817bdcc56 100644
--- a/arch/arm/boot/dts/omap4-sdp.dts
+++ b/arch/arm/boot/dts/omap4-sdp.dts
@@ -26,6 +26,9 @@
};
vdd_eth: fixedregulator-vdd-eth {
+ pinctrl-names = "default";
+ pinctrl-0 = <&enet_enable_gpio>;
+
compatible = "regulator-fixed";
regulator-name = "VDD_ETH";
regulator-min-microvolt = <3300000>;
@@ -352,6 +355,29 @@
OMAP4_IOPAD(0x152, PIN_INPUT_PULLUP | MUX_MODE0) /* sdmmc5_dat3.sdmmc5_dat3 */
>;
};
+
+ /* gpio_48 for ENET_ENABLE */
+ enet_enable_gpio: pinmux_enet_enable_gpio {
+ pinctrl-single,pins = <
+ OMAP4_IOPAD(0x070, PIN_OUTPUT_PULLDOWN | MUX_MODE3) /* gpmc_a24.gpio_48 */
+ >;
+ };
+
+ ks8851_pins: pinmux_ks8851_pins {
+ pinctrl-single,pins = <
+ /* ENET_INT */
+ OMAP4_IOPAD(0x054, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_ad10.gpio_34 */
+ /*
+ * Misterious pin which makes the ethernet working
+ * The legacy board file requested this pin on boot
+ * (ETH_KS8851_QUART) and set it to high, similarly to
+ * the ENET_ENABLE pin.
+ * We could use gpio-hog to keep it high, but let's use
+ * it as a reset GPIO for ks8851.
+ */
+ OMAP4_IOPAD(0x13a, PIN_OUTPUT_PULLUP | MUX_MODE3) /* mcspi1_cs1.gpio_138 */
+ >;
+ };
};
&i2c1 {
@@ -452,12 +478,16 @@
pinctrl-0 = <&mcspi1_pins>;
eth@0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&ks8851_pins>;
+
compatible = "ks8851";
spi-max-frequency = <24000000>;
reg = <0>;
interrupt-parent = <&gpio2>;
interrupts = <2 IRQ_TYPE_LEVEL_LOW>; /* gpio line 34 */
vdd-supply = <&vdd_eth>;
+ reset-gpios = <&gpio5 10 GPIO_ACTIVE_HIGH>;
};
};
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
