[U-Boot] [PATCH v3] am3517_evm: activate Ethernet PHY

[Yegor Yefremov]

On Fri, Dec 6, 2013 at 11:37 AM, Stefan Roese <stefan.roese at gmail.com> wrote:
> On 06.12.2013 11:17, yegorslists at googlemail.com wrote:
>> From: Yegor Yefremov <yegorslists at googlemail.com>
>>
>> Pin 30 is connected to PHY's RESET# signal, so it must be
>> put to high. Otherwise PHY won't be found via MDIO interface.
>>
>> Signed-off-by: Yegor Yefremov <yegorslists at googlemail.com>
>
> Looks good. One questions below though:
>
>> ---
>> Changes:
>>       v3: use "__maybe_unused", instead of #if defined statement (Stefan Roese)
>>       v2: put ctr and reset under #if defined statement, to avoid compiler warnings, when EMAC is not selected
>>
>>  board/logicpd/am3517evm/am3517evm.c |   34 ++++++++++++++++++++++++++++++++++
>>  board/logicpd/am3517evm/am3517evm.h |    2 +-
>>  2 files changed, 35 insertions(+), 1 deletions(-)
>>
>> diff --git a/board/logicpd/am3517evm/am3517evm.c b/board/logicpd/am3517evm/am3517evm.c
>> index 1569905..3b1dfd1 100644
>> --- a/board/logicpd/am3517evm/am3517evm.c
>> +++ b/board/logicpd/am3517evm/am3517evm.c
>> @@ -22,6 +22,7 @@
>>  #include <asm/arch/musb.h>
>>  #include <asm/mach-types.h>
>>  #include <asm/errno.h>
>> +#include <asm/gpio.h>
>>  #include <linux/usb/ch9.h>
>>  #include <linux/usb/gadget.h>
>>  #include <linux/usb/musb.h>
>> @@ -31,6 +32,9 @@
>>
>>  DECLARE_GLOBAL_DATA_PTR;
>>
>> +#define AM3517_IP_SW_RESET   0x48002598
>> +#define CPGMACSS_SW_RST              (1 << 1)
>> +
>>  /*
>>   * Routine: board_init
>>   * Description: Early hardware init.
>> @@ -98,6 +102,9 @@ static void am3517_evm_musb_init(void)
>>   */
>>  int misc_init_r(void)
>>  {
>> +     __maybe_unused volatile unsigned int ctr;
>> +     __maybe_unused u32 reset;
>> +
>>  #ifdef CONFIG_SYS_I2C_OMAP34XX
>>       i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED, CONFIG_SYS_OMAP24_I2C_SLAVE);
>>  #endif
>> @@ -106,6 +113,33 @@ int misc_init_r(void)
>>
>>       am3517_evm_musb_init();
>>
>> +#if defined(CONFIG_DRIVER_TI_EMAC)
>> +     /* activate PHY reset */
>> +     gpio_direction_output(30, 0);
>> +     gpio_set_value(30, 0);
>> +
>> +     ctr  = 0;
>> +     do {
>> +             udelay(1000);
>> +             ctr++;
>> +     } while (ctr < 300);
>> +
>> +     /* deactivate PHY reset */
>> +     gpio_set_value(30, 1);
>> +
>> +     /* allow the PHY to stabilize and settle down */
>> +     ctr = 0;
>> +     do {
>> +             udelay(1000);
>> +             ctr++;
>> +     } while (ctr < 300);
>> +
>> +     /* ensure that the module is out of reset */
>> +     reset = readl(AM3517_IP_SW_RESET);
>> +     reset &= (~CPGMACSS_SW_RST);
>> +     writel(reset,AM3517_IP_SW_RESET);
>> +#endif
>
> Why do you need to put this "#if defined(CONFIG_DRIVER_TI_EMAC)" here at
> all? Isn't CONFIG_DRIVER_TI_EMAC enabled for this board always?

It is enabled in arago repository:
http://arago-project.org/git/projects/?p=u-boot-omap3.git;a=blob;f=include/configs/am3517_evm.h;h=b37b81e2aa5d635d14db87393e751ac25cb3611e;hb=HEAD,
but not in upstream u-boot. I was testing the stuff with my own board,
so my am3517_evm.h is a little bit messy for now. That's why I wanted
to have this change only in board/logicpd/am3517evm/am3517evm.c. It
does no harm so far. I could patch am3517_evm.h later.

Yegor