NFC PN5180 on the IMX7D

[chandiniindavar]

H

I'm using IMX7D board and Freesacle Linux kernel 4.1.15 for development [using YOCTO to build]

I'm trying to insert NXP NFCRdLib Kernel BAL(Bus Abstraction Layer) Module. with reference of

GitHub - christianeisendle/nxprdlib-kernel-bal: NXP NFCRdLib Kernel BAL Module

successfully built  "bal.ko"  file and i did few changes in imx7d-sdb.dts file .

        &ecspi3 {

        fsl,spi-num-chipselects = <1>;

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_ecspi3 &pinctrl_ecspi3_cs>;

        cs-gpios = <&gpio6 22 0>;

        status = "okay";

        spidev0: spi@0 {

        compatible = "nxp,bal";

        reg = <0>;

        spi-max-frequency = <500000>;

        };

}

pinctrl_ecspi3_cs: ecspi3_cs_grp {

 fsl,pins = <

 MX7D_PAD_SAI2_TX_DATA__GPIO6_IO22   0x80000000

 >;

 };

pinctrl_ecspi3: ecspi3grp {

  fsl,pins = <

  MX7D_PAD_SAI2_TX_SYNC__ECSPI3_MISO 0x2

  MX7D_PAD_SAI2_TX_BCLK__ECSPI3_MOSI 0x2

  MX7D_PAD_SAI2_RX_DATA__ECSPI3_SCLK 0x2

  >;

  };

     
built new kernel .

But after inserting module getting below messages.

$  insmod bal.ko

Registering character device /dev/bal. Status: 0

BAL_SPI_DRIVER spi2.0: Probing BAL driver

BAL_SPI_DRIVER spi2.0: BUSY pin mapped to an invalid GPIO!

I know . i need to modify kernel in order to assign one SPI device with BAL module instead of the spidev module. But i am not sure where i need to make changes.

Could anyone help me to track this ?

For more refernce attached bal.c .

Thanks in advance.

Chandini

Original Attachment has been moved to: bal.c.zip

[chandiniindavar]

we can use spi frequency 5Mhz or 7.5Mhz with bal driver

I tried up to 7.5 Mhz

[igorpadykov]

Hi Chandini

please look at necessary changes on

How to enable spidev for all SPI (1-5) for MX6 | NXP Community

Best regards

igor

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[chandiniindavar]

Thanks for replay igor.

They are few things.

1. in that link they specified one location "/arch/arm/mach-mx6/board-mx6q_sabrelite.c" . that is not exists in my kernel. [might be because of i am using new kernel 4.1.15 ]

2. I got working SPI already. by below changes in imx7d-sdb.dts

&ecspi3 {

        fsl,spi-num-chipselects = <1>;

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_ecspi3 &pinctrl_ecspi3_cs>;

        cs-gpios = <&gpio6 22 0>;

        status = "okay";

        spidev0: spi@0 {

        compatible = "spidev";

        reg = <0>;

        spi-max-frequency = <500000>;

        };

}

pinctrl_ecspi3_cs: ecspi3_cs_grp {

 fsl,pins = <

 MX7D_PAD_SAI2_TX_DATA__GPIO6_IO22   0x80000000

 >;

 };

pinctrl_ecspi3: ecspi3grp {

  fsl,pins = <

  MX7D_PAD_SAI2_TX_SYNC__ECSPI3_MISO 0x2

  MX7D_PAD_SAI2_TX_BCLK__ECSPI3_MOSI 0x2

  MX7D_PAD_SAI2_RX_DATA__ECSPI3_SCLK 0x2

  >;

  };

3. Problem is to link/configure spidev2.0 for bal driver. for that i need to add busy pin like how they did for raspberry pi,

because i am getting

$  insmod bal.ko

Registering character device /dev/bal. Status: 0

BAL_SPI_DRIVER spi2.0: Probing BAL driver

BAL_SPI_DRIVER spi2.0: BUSY pin mapped to an invalid GPIO!

BR

Chandini

[chandiniindavar · Accepted solution]

I got it working . i am posting here because it may be useful for others.

1. Add below config to imx_v7_defconfig for spi

# MT Add

CONFIG_SPI_SPIDEV=y

CONFIG_SPI_MASTER=y

CONFIG_SPI_BITBANG=y

CONFIG_IMX_HAVE_PLATFORM_SPI_IMX=y

CONFIG_REGMAP_SPI=y

CONFIG_SPI_FSL_QUADSPI=y

CONFIG_SPI_MC13XXX_SPI=y

CONFIG_SND_SPI=y

CONFIG_SND_SOC_I2C_AND_SPI=y

# MT end

2 For 4.1.15 kernel Modify imx7d-sdb.dts file is enough

        &ecspi3 {

        fsl,spi-num-chipselects = <1>;

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_ecspi3 &pinctrl_ecspi3_cs>;

        cs-gpios = <&gpio6 22 0>;

        status = "okay";

        bal: nxprdlib-bal@0 {

        compatible = "nxp,bal";

        reg = <0>;

  busy-pin-gpio= <&gpio1 2 0>;

        spi-max-frequency = <500000>;

  status="okay";

        };

}

pinctrl_ecspi3_cs: ecspi3_cs_grp {

fsl,pins = <

MX7D_PAD_SAI2_TX_DATA__GPIO6_IO22   0x80000000

>;

};

pinctrl_ecspi3: ecspi3grp {

  fsl,pins = <

  MX7D_PAD_SAI2_TX_SYNC__ECSPI3_MISO 0x2

  MX7D_PAD_SAI2_TX_BCLK__ECSPI3_MOSI 0x2

  MX7D_PAD_SAI2_RX_DATA__ECSPI3_SCLK 0x2

  >;

  };

3 .Build zimage and imx7d-sdb.dtb outside of yocto , as soon so i insert module . i can see "bal" device under "dev"

Thank you

Chandini