AM3352: Pinmux configuration source code for AM335x GP EVM

Takayuki Miyazaki

Part Number: AM3352

Hello team,

I received inquiries about Pinmux configuration. According to AM335x's TRM "9.3.1 CONTROL_MODULE Registers", those registers are defined as follows.

9E4h conf_emu0

9E8h conf_emu1

9F8h conf_rtc_pwronrstn

9FCh conf_pmic_power_en

A00h conf_ext_wakeup

However, according to u-boot source code (u-boot/arch/arm/include/asm/arch-am33xx/mux_am33xx.h), the following structure is defined

struct pad_signals {

int gpmc_ad0;

   ： (ellipsis)

int emu0;

int emu1;

int osc1_in;

int osc1_out;

int pmic_power_en;

int rtc_porz;

int rsvd2;

int ext_wakeup;

　　：(ellipsis)

int vrefn;

};

Therefore, customer thinks there is different offset between TRM definitions and source code definitions. Should customer swap source pmic_power_en and rsvd2 ? Can we have adivice/comments on this, please?

Best regards,

Miyazaki

over 5 years ago

0 Fleenor over 5 years ago

TI__Mastermind 19982 points

Hey Miyazaki,

We are looking into this discrepancies between TRM and Uboot SW. We will get back to you with more information before the end of the week. Thank you for your patience!

Best regards,

0 Fleenor over 5 years ago

TI__Mastermind 19982 points

Hello Miyazaki,

Sorry for the delay here. We are following up with SW team in order to better understand why the Source Code differs from TRM values. What does it mean for the customer to "swap source pmix_power_en and rsvd2"?

Best regards,

0 Takayuki Miyazaki over 5 years ago in reply to Fleenor

TI__Genius 10120 points

Hello Zackary,

Thanks for your help

Customer is considering that “int pmic_power_en;” is out of position (offset is wrong) if TRM is correct. Therefore, customer would like to know they should modify them as follows. Can we have your advice, please?

struct pad_signals {

int gpmc_ad0;

   ：

int emu0;

int emu1;

int osc1_in;

int osc1_out;

int rsvd2;     // <--

int rtc_porz;

int pmic_power_en;     // <--

int ext_wakeup;

　　：

int vrefn;

};

Best regards,

Miyazaki

0 Takayuki Miyazaki over 5 years ago in reply to Takayuki Miyazaki

TI__Genius 10120 points

Hello Zackary,

Can I have your expert's comments on this, please?

Best regards,

Miyazaki

0 Hong Guan64 over 5 years ago in reply to Takayuki Miyazaki

TI__Guru 64995 points

Hi Miyazaki-san,

I added testing code in the latest u-boot (SDK 6.3), and the captured offset in u-boot is listed in the table below.

There’s a swap as shown below (yellow/green highlighted).

It seems the mux definition in u-boot (u-boot/arch/arm/include/asm/arch-am33xx/mux_am33xx.h) has been there for a long time, but there’s no functional impact even with the in-correct offset of “PMIC_POWER_EN” since there’s no other signals being multiplexed internally with “PMIC_POWER_EN” anyway.

PINMUX pad register name	PINMUX pad register offset
PINMUX pad register name	Design/TRM	u-boot
RTC_XTALIN	0x09EC	0x09EC
RTC_XTALOUT	0x09F0	0x09F0
Reserved	0x09F4	0x09FC
RTC_PWRONRSTn	0x09F8	0x09F8
PMIC_POWER_EN	0x09FC	0x09F4
EXT_WAKEUP	0x0A00	0x0A00

I'll report the findings internally on future u-boot code update. At the same time, your proposed code change looks good to me.

Best,

-Hong

0 Takayuki Miyazaki over 5 years ago in reply to Hong Guan64

TI__Genius 10120 points

Hello Hong,

Thank you for your clarification. I shared your comments on this with customer.

I appreciate your help.

Best regards,

Miyazaki

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AM3352: Pinmux configuration source code for AM335x GP EVM