Re: Question regarding Linux-6.3.5 and Sunxi A20 NAND/NFC support

From: Bagas Sanjaya
Date: Mon Aug 14 2023 - 01:11:53 EST

On Mon, Aug 14, 2023 at 12:40:26AM +0100, Fawad Lateef wrote:
> Hi,
>
> I am trying to make Linux-6.3.5 working on Olimex/Sunxi A20 SOM with NAND.
>
> Found that the Sunxi A20 NAND is supported in mainline kernel
> (drivers/mtd/nand/raw/sunxi_nand.c) and following the guidelines here
> (https://linux-sunxi.org/Mainline_NAND_Howto); I added the NFC chip
> pin information in sunxi-a20.dtsi and defined/enabled the nfc
> controller in the sunxi-a20-olinuxino-micro.dts files.
>
> The changes I made are below. Problem is when I define the nfc node
> entry in dts file "without" pinctrl entry (pinctrl-0 = <&nand_pins_a>,
> <&nand_cs0_pins_a>, <&nand_rb0_pins_a>;), the sunxi_nfc_probe function
> is called (though the No NAND chip is detected).
>
> And if I define the pinctrl-0 in the nfc node, all I see related to
> NAND/sunxi in the kernel boot log is this line: platform
> 1c03000.nand-controller: deferred probe pending.
>
> Can someone please guide me why the deferred probe is pending but
> never call the sunxi_nfc_probe function? And without pinctrl-0 entry
> why probe function is being called?
>
> Seems like I am missing something basic here and any pointers to debug
> this will be appreciated.
>
>
> --- linux-6.3.5.orig/arch/arm/boot/dts/sun7i-a20-olinuxino-micro.dts
> 2023-05-30 14:17:29.000000000 +0100
> +++ linux-6.3.5/arch/arm/boot/dts/sun7i-a20-olinuxino-micro.dts
> 2023-08-13 23:27:22.405058025 +0100
> @@ -56,7 +56,7 @@
>
> aliases {
> serial0 = &uart0;
> - serial1 = &uart6;
> + serial1 = &uart2;
> serial2 = &uart7;
> spi0 = &spi1;
> spi1 = &spi2;
> @@ -66,17 +66,6 @@
> stdout-path = "serial0:115200n8";
> };
>
> - hdmi-connector {
> - compatible = "hdmi-connector";
> - type = "a";
> -
> - port {
> - hdmi_con_in: endpoint {
> - remote-endpoint = <&hdmi_out_con>;
> - };
> - };
> - };
> -
> leds {
> compatible = "gpio-leds";
> pinctrl-names = "default";
> @@ -90,16 +79,55 @@
> };
> };
>
> -&ahci {
> - target-supply = <&reg_ahci_5v>;
> +&nfc {
> + pinctrl-names = "default";
> + pinctrl-0 = <&nand_pins_a>, <&nand_cs0_pins_a>, <&nand_rb0_pins_a>;
> status = "okay";
> +
> + nand@0 {
> + #address-cells = <2>;
> + #size-cells = <2>;
> + reg = <0>;
> + allwinner,rb = <0>;
> +
> + nand-ecc-mode = "hw";
> + nand-on-flash-bbt;
> + };
> +
> + boot0@0 {
> + label = "boot0";
> + reg = /bits/ 64 <0x0 0x200000>;
> + };
> +
> + boot0-rescue@200000 {
> + label = "boot0-rescue";
> + reg = /bits/ 64 <0x200000 0x200000>;
> + };
> +
> + uboot@400000 {
> + label = "uboot";
> + reg = /bits/ 64 <0x400000 0x200000>;
> + };
> +
> + uboot-rescue@600000 {
> + label = "uboot-rescue";
> + reg = /bits/ 64 <0x600000 0x200000>;
> + };
> +
> + main@800000 {
> + label = "main";
> + reg = /bits/ 64 <0x800000 0xff800000>;
> + };
> +
> };
>
> -&codec {
> +&ahci {
> + target-supply = <&reg_ahci_5v>;
> status = "okay";
> };
>
> &cpu0 {
> + clock-frequency = <900000000>;
> cpu-supply = <&reg_dcdc2>;
> };
>
> @@ -123,34 +151,24 @@
> status = "okay";
> };
>
> -&hdmi {
> - status = "okay";
> -};
> -
> -&hdmi_out {
> - hdmi_out_con: endpoint {
> - remote-endpoint = <&hdmi_con_in>;
> - };
> -};
> -
> &i2c0 {
> - status = "okay";
> + status = "okay";
>
> - axp209: pmic@34 {
> - reg = <0x34>;
> - interrupt-parent = <&nmi_intc>;
> - interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
> - };
> + axp209: pmic@34 {
> + reg = <0x34>;
> + interrupt-parent = <&nmi_intc>;
> + interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
> + };
> };
>
> &i2c1 {
> - status = "okay";
> + status = "okay";
>
> - eeprom: eeprom@50 {
> - compatible = "atmel,24c16";
> - reg = <0x50>;
> - pagesize = <16>;
> - };
> + eeprom: eeprom@50 {
> + compatible = "atmel,24c16";
> + reg = <0x50>;
> + pagesize = <16>;
> + };
> };
>
> &i2c2 {
> @@ -160,55 +178,6 @@
> &lradc {
> vref-supply = <&reg_vcc3v0>;
> status = "okay";
> -
> - button-191 {
> - label = "Volume Up";
> - linux,code = <KEY_VOLUMEUP>;
> - channel = <0>;
> - voltage = <191274>;
> - };
> -
> - button-392 {
> - label = "Volume Down";
> - linux,code = <KEY_VOLUMEDOWN>;
> - channel = <0>;
> - voltage = <392644>;
> - };
> -
> - button-601 {
> - label = "Menu";
> - linux,code = <KEY_MENU>;
> - channel = <0>;
> - voltage = <601151>;
> - };
> -
> - button-795 {
> - label = "Search";
> - linux,code = <KEY_SEARCH>;
> - channel = <0>;
> - voltage = <795090>;
> - };
> -
> - button-987 {
> - label = "Home";
> - linux,code = <KEY_HOMEPAGE>;
> - channel = <0>;
> - voltage = <987387>;
> - };
> -
> - button-1184 {
> - label = "Esc";
> - linux,code = <KEY_ESC>;
> - channel = <0>;
> - voltage = <1184678>;
> - };
> -
> - button-1398 {
> - label = "Enter";
> - linux,code = <KEY_ENTER>;
> - channel = <0>;
> - voltage = <1398804>;
> - };
> };
>
> &gmac_mdio {
> @@ -239,10 +208,6 @@
> status = "okay";
> };
>
> -&otg_sram {
> - status = "okay";
> -};
> -
> &pio {
> gmac_txerr: gmac-txerr-pin {
> pins = "PA17";
> @@ -323,9 +288,9 @@
> status = "okay";
> };
>
> -&uart6 {
> +&uart2 {
> pinctrl-names = "default";
> - pinctrl-0 = <&uart6_pi_pins>;
> + pinctrl-0 = <&uart2_pi_pins>;
> status = "okay";
> };
>
> @@ -352,3 +317,28 @@
> usb2_vbus-supply = <&reg_usb2_vbus>;
> status = "okay";
> };
> +
> +&fe0 {
> + status = "disabled";
> +};
> +
> +&fe1 {
> + status = "disabled";
> +};
> +
> +&be0 {
> + status = "disabled";
> +};
> +
> +&be1 {
> + status = "disabled";
> +};
> +
> +&tcon0 {
> + status = "disabled";
> +};
> +
> +&tcon1 {
> + status = "disabled";
> +};
> +
>
>
> --- linux-6.3.5.orig/arch/arm/boot/dts/sun7i-a20.dtsi 2023-05-30
> 14:17:29.000000000 +0100
> +++ linux-6.3.5/arch/arm/boot/dts/sun7i-a20.dtsi 2023-08-08
> 00:30:04.689288733 +0100
> @@ -345,6 +345,58 @@
> #size-cells = <0>;
> };
>
> + nand_pins_a: nand_base0@0 {
> + allwinner,pins = "PC0", "PC1", "PC2",
> + "PC5", "PC8", "PC9", "PC10",
> + "PC11", "PC12", "PC13", "PC14",
> + "PC15", "PC16";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> + nand_cs0_pins_a: nand_cs@0 {
> + allwinner,pins = "PC4";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> + nand_cs1_pins_a: nand_cs@1 {
> + allwinner,pins = "PC3";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> + nand_cs2_pins_a: nand_cs@2 {
> + allwinner,pins = "PC17";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> + nand_cs3_pins_a: nand_cs@3 {
> + allwinner,pins = "PC18";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> + nand_rb0_pins_a: nand_rb@0 {
> + allwinner,pins = "PC6";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> + nand_rb1_pins_a: nand_rb@1 {
> + allwinner,pins = "PC7";
> + allwinner,function = "nand0";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> +
> spi0: spi@1c05000 {
> compatible = "allwinner,sun4i-a10-spi";
> reg = <0x01c05000 0x1000>;
>
>

Thanks for the suggestion diff. Can you submit it as formal patch against
current sunxi/for-next tree [1]? See
Documentation/process/submitting-patches.rst for how to properly submit
patches.

Thanks.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git/log/?h=sunxi/for-next

--
An old man doll... just what I always wanted! - Clara

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