[PATCH] i.MX: vf610: Add support for ZII VF610 Dev Family

[Sascha Hauer]

Hi Andrey,

On Sun, Jan 22, 2017 at 09:57:34PM -0800, Andrey Smirnov wrote:
> Add support for ZII VF610 Dev based designs such as:
> 
>     - VF610 Dev, revision B
>     - VF610 Dev, revision C
>     - CFU1, revision A
>     - SPU3, revision A
>     - SCU4 AIB, revision C
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
> ---
> 
> Sascha, this patch is rebased on 'next' instead of 'master' so that
> you won't have to resolve conflicts with RDU2 patches in 'next'. Let
> me know if you'd rather have it rebased on 'master'.

It's fine to base on next in this case.

> +struct named_signal {
> +	unsigned int gpio;
> +	const char *name;
> +	int value;
> +};
> +
> +static int expose_signals(const struct named_signal *signals,
> +			      size_t signal_num)
> +{
> +	int ret, i;
> +
> +	for (i = 0; i < signal_num; i++) {
> +		const struct named_signal *signal = &signals[i];
> +
> +		if (signal->value < 0)
> +			ret = gpio_direction_input(signal->gpio);
> +		else
> +			ret = gpio_direction_output(signal->gpio, signal->value);
> +
> +		if (ret) {
> +			pr_err("Failed to configure \"%s\"\n", signal->name);
> +			return ret;
> +		}

This looks like gpio_request_array(). Could you use this instead?

> index 0000000..4465632
> --- /dev/null
> +++ b/arch/arm/boards/zii-vf610-dev/lowlevel.c
> @@ -0,0 +1,132 @@
> +#include <common.h>
> +#include <linux/sizes.h>
> +#include <mach/generic.h>
> +#include <asm/barebox-arm-head.h>
> +#include <asm/barebox-arm.h>
> +#include <mach/vf610-regs.h>
> +#include <mach/clock-vf610.h>
> +#include <mach/iomux-vf610.h>
> +#include <debug_ll.h>
> +
> +#if defined(CONFIG_DEBUG_LL)
> +#	if !defined(CONFIG_DEBUG_VF610_UART)
> +#		warning "CONFIG_DEBUG_LL is enabled but CONFIG_DEBUG_VF610_UART is not"
> +#	else
> +#		if CONFIG_DEBUG_IMX_UART_PORT != 1
> +#			warning "CONFIG_DEBUG_LL output is not drirected to port 1"
> +#		endif
> +#	endif
> +#endif

Just because this board is enabled doesn't mean the user is actually
currently interested in this board. He might want to enable
CONFIG_DEBUG_LL for another board, still he is warned about an invalid
config here. This is not good.

You could drop the DEBUG_LL support and instead go to PBL console
support. See arch/arm/boards/freescale-mx6-sabrelite/lowlevel.c
for a good example. Basically it means you call this right after entry:

	arm_early_mmu_cache_invalidate();
        relocate_to_current_adr();
        setup_c();
        barrier();

>From here on you have a valid C environment (And thus don't need to work
around switch/case with wrong LUTs) and can also call:

	pbl_set_putc(xxx_uart_putc, uart);

after that you can use printf like functions to print messages.

Sascha


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