how to binding the i2c platform data in the device tree dtsi configuration?

[wind1109w88]

Hi all,

We have a i.mx6 solo boar with yocto linux 4.1.15 and need porting the i2c eeprom as the MAC address.

Now I could write and dump the eeprom data from console with command to see the MAC address what I write into.

But I have question about the Device tree (dtsi) how to binding the i2c platform data.

As my previous i.mx6 quard linux 3.0.35 experience. I could config it to work as follows 4 steps.

But in yocto linux 4.1.15, how to binding the i2c platform data in the device tree dtsi configuration? And I could not find the board.c file for the i.mx6 solo in kernel/.../mach-imx. Is there someone know which board.c is match for i.mx6 solo. 

Is there someone could help me. Thanks ~

/* CAT24C256 EEPROM */
eeprom@50 {
compatible = "at,24c256";
reg = <0x50>;
page_size = <64>;
byte_len = <32768>;
flags = <16>;
context = <0x0000>;
};

1. CONFIG_EEPROM_AT24=y

2. mach-mx6/board-mx6q_sabresd.c
static struct at24_platform_data eeprom_info = {
.byte_len = (256*1024) / 8,
.page_size = 64,
.flags = AT24_FLAG_ADDR16,
.setup = get_mac_addr,
.context = (void *)0x0000,
};

3.static struct i2c_board_info mxc_i2c2_board_info[] __initdata = {
{
I2C_BOARD_INFO("24c256", 0x50),
.platform_data = &eeprom_info,
},
};

4. drivers/net/fec.c

#include <linux/i2c.h>
#include <linux/memory.h>
char gmac_addr[6];
void get_mac_addr(struct memory_accessor *mem_acc, void *context)
{

int i;
off_t offset = (off_t)context;

mem_acc->read(mem_acc, gmac_addr, offset, ETH_ALEN);
for (i = 0; i < 6; i++) {
printk("mac_addr[%d]=0x%x\n",i,gmac_addr[i]);
}
}
EXPORT_SYMBOL(get_mac_addr);

static void __inline__ fec_get_mac(struct net_device *ndev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
struct fec_platform_data *pdata = fep->pdev->dev.platform_data;
unsigned char *iap, tmpaddr[ETH_ALEN];

/*
* try to get mac address in following order:
*
* 1) module parameter via kernel command line in form
* fec.macaddr=0x00,0x04,0x9f,0x01,0x30,0xe0
*/
iap = macaddr;
printk(KERN_INFO "1 ========fec_get_mac==0x%x\n",*iap);
/*
* 2) from flash or fuse (via platform data)
*/
if (!is_valid_ether_addr(iap)) {
#ifdef CONFIG_M5272
if (FEC_FLASHMAC)
iap = (unsigned char *)FEC_FLASHMAC;
#else
//if (pdata)
if((gmac_addr[0]==0xff && gmac_addr[1]==0xff )){
memcpy(iap, pdata->mac, ETH_ALEN);
}else{
memcpy(iap, gmac_addr, ETH_ALEN);
}
#endif

}

[igorpadykov]

Hi Roger

one can check available options in /Documentation/devicetree/bindings/net
but seems there is no way for that. Based on driver sources in
drivers/net/ethernet/freescale/fec_main.c, platform data can provide
mac address using fuses, please check  function fec_get_mac(). In general
one can add additional dts parameter using of_property_read_u32(), use
as example "phy-reset-gpios" or write own driver as it is done in
https://community.nxp.com/thread/384421

Best regards
igor
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[wind1109w88]

Thanks very much ~

I will try the way of write own driver and test again.