[U-Boot] [PATCH 21/21] arm: imx: add i.MX6ULL 14x14 EVK board support

[Peng Fan]

Hi Jagan,
On Wed, Sep 14, 2016 at 12:41:17AM +0530, Jagan Teki wrote:
>Hi Peng,
>
>On Thu, Sep 8, 2016 at 7:05 AM, Peng Fan <van.freenix at gmail.com> wrote:
>> Hi Jagan,
>> On Wed, Sep 07, 2016 at 08:21:07PM +0530, Jagan Teki wrote:
>>>On Thu, Aug 11, 2016 at 11:32 AM, Peng Fan <van.freenix at gmail.com> wrote:
>>>> Add i.MX6ULL EVK board support:
>>>> Add device tree file, which is copied from NXP Linux.
>>>> Enabled DM_MMC, DM_GPIO, DM_I2C, DM_SPI, PINCTRL, DM_REGULATOR.
>>>> The uart iomux settings are still keeped in board file.
>>>>
>>>> Boot Log:
>>>> U-Boot 2016.09-rc1-00366-gbb419ef-dirty (Aug 11 2016 - 13:08:58 +0800)
>>>>
>>>> CPU:   Freescale i.MX6ULL rev1.0 at 396MHz
>>>> CPU:   Commercial temperature grade (0C to 95C) at 15C
>>>> Reset cause: POR
>>>> Model: Freescale i.MX6 ULL 14x14 EVK Board
>>>> Board: MX6ULL 14x14 EVK
>>>> DRAM:  512 MiB
>>>> MMC:   initialized IMX pinctrl driver
>>>> FSL_SDHC: 0, FSL_SDHC: 1
>>>
>>><snip>
>>>
>>>> diff --git a/board/freescale/mx6ullevk/mx6ullevk.c b/board/freescale/mx6ullevk/mx6ullevk.c
>>>> new file mode 100644
>>>> index 0000000..489bf21
>>>> --- /dev/null
>>>> +++ b/board/freescale/mx6ullevk/mx6ullevk.c
>>>> @@ -0,0 +1,99 @@
>>>> +/*
>>>> + * Copyright (C) 2016 Freescale Semiconductor, Inc.
>>>> + *
>>>> + * SPDX-License-Identifier:    GPL-2.0+
>>>> + */
>>>> +
>>>> +#include <asm/arch/clock.h>
>>>> +#include <asm/arch/iomux.h>
>>>> +#include <asm/arch/imx-regs.h>
>>>> +#include <asm/arch/crm_regs.h>
>>>> +#include <asm/arch/mx6-pins.h>
>>>> +#include <asm/arch/sys_proto.h>
>>>> +#include <asm/gpio.h>
>>>> +#include <asm/imx-common/iomux-v3.h>
>>>> +#include <asm/imx-common/boot_mode.h>
>>>> +#include <asm/io.h>
>>>> +#include <common.h>
>>>> +#include <fsl_esdhc.h>
>>>> +#include <linux/sizes.h>
>>>> +#include <mmc.h>
>>>> +
>>>> +DECLARE_GLOBAL_DATA_PTR;
>>>> +
>>>> +#define UART_PAD_CTRL  (PAD_CTL_PKE | PAD_CTL_PUE |            \
>>>> +       PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED |               \
>>>> +       PAD_CTL_DSE_40ohm   | PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
>>>> +
>>>> +int dram_init(void)
>>>> +{
>>>> +       gd->ram_size = imx_ddr_size();
>
>Is this common call for all imx soc's to get the ddr size? because I
>observed incorrect size when I call this function.
>
>>>> +
>>>> +       return 0;
>>>> +}
>>>> +
>>>> +static iomux_v3_cfg_t const uart1_pads[] = {
>>>> +       MX6_PAD_UART1_TX_DATA__UART1_DCE_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
>>>> +       MX6_PAD_UART1_RX_DATA__UART1_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
>>>> +};
>>>> +
>>>> +static void setup_iomux_uart(void)
>>>> +{
>>>> +       imx_iomux_v3_setup_multiple_pads(uart1_pads, ARRAY_SIZE(uart1_pads));
>>>> +}
>>>> +
>>>> +int board_mmc_get_env_dev(int devno)
>>>> +{
>>>> +       return devno;
>>>> +}
>>>> +
>>>> +int mmc_map_to_kernel_blk(int devno)
>>>> +{
>>>> +       return devno;
>>>> +}
>>>> +
>>>> +int board_early_init_f(void)
>>>> +{
>>>> +       setup_iomux_uart();
>>>
>>>Don't we need iomux settings for sdhc? I guess pinctrl for SD not
>>>supporting now.
>>
>> The pinctrl driver will configure the pinmux, no need to add iomux settings
>> in board file. In this patchset, I enabled PINCTRL, DM_MMC, DM_GPIO and etc.
>
>Yeah, but the uart pinx mux are still in board file right?

I did not enable DM UART. Since lowlevel debug not implemented for i.MX6,
I need to initialize uart as early as possible. When lowlevel debug
implemented, we could switch to use pinctrl to initialze uart pinmux and
use DM UART.
So now I keep the uart pinmux settings in board file.

Regards,
Peng.
>
>-- 
>Jagan Teki
>Free Software Engineer | www.openedev.com
>U-Boot, Linux | Upstream Maintainer
>Hyderabad, India.