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imx: ventana: enable pwm device-tree property based on hwconfig

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Most Ventana boards have a connector with off-board digital-I/O signals
including some that can be pinmuxed as either a PWM or a GPIO. The hwconfig
env variable is used to configure these and they will be pinmuxed according
to this configuration in the bootloader.

This patch adds a device-tree fixup that will enable the pwm controller
nodes appropriately for digital-I/O's that are configured as pwm via hwconfig
so that the pin can be used with the Linux kernel /sys/class/pwm API.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2016-05-24 11:03:55 -07:00 committed by Stefano Babic
parent 83e00f193e
commit f17a9af846
2 changed files with 35 additions and 0 deletions
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5
board/gateworks/gw_ventana/common.c
View File

@ -762,6 +762,11 @@ void setup_board_gpio(int board, struct ventana_board_info *info)
gpio_direction_input(cfg->gpio_param);
} else if (hwconfig_subarg_cmp(arg, "mode", "pwm") &&
cfg->pwm_padmux) {
if (!cfg->pwm_param) {
printf("DIO%d: Error: pwm config invalid\n",
i);
continue;
}
if (!quiet)
printf("DIO%d: pwm%d\n", i, cfg->pwm_param);
imx_iomux_v3_setup_pad(cfg->pwm_padmux[cputype] |

30
board/gateworks/gw_ventana/gw_ventana.c
View File

@ -21,6 +21,7 @@
#include <asm/io.h>
#include <dm.h>
#include <dm/platform_data/serial_mxc.h>
#include <hwconfig.h>
#include <i2c.h>
#include <fdt_support.h>
#include <fsl_esdhc.h>
@ -777,6 +778,16 @@ static int ft_sethdmiinfmt(void *blob, char *mode)
return 0;
}
/* enable a property of a node if the node is found */
static inline void ft_enable_path(void *blob, const char *path)
{
int i = fdt_path_offset(blob, path);
if (i >= 0) {
debug("enabling %s\n", path);
fdt_status_okay(blob, i);
}
}
/*
* called prior to booting kernel or by 'fdt boardsetup' command
*
@ -920,6 +931,25 @@ int ft_board_setup(void *blob, bd_t *bd)
ft_sethdmiinfmt(blob, "yuv422bt656");
}
/* Configure DIO */
for (i = 0; i < gpio_cfg[board_type].num_gpios; i++) {
struct dio_cfg *cfg = &gpio_cfg[board_type].dio_cfg[i];
char arg[10];
sprintf(arg, "dio%d", i);
if (!hwconfig(arg))
continue;
if (hwconfig_subarg_cmp(arg, "mode", "pwm") && cfg->pwm_param)
{
char path[48];
sprintf(path, "/soc/aips-bus@02000000/pwm@%08x",
0x02080000 + (0x4000 * (cfg->pwm_param - 1)));
printf(" Enabling pwm%d for DIO%d\n",
cfg->pwm_param, i);
ft_enable_path(blob, path);
}
}
/*
* Peripheral Config:
* remove nodes by alias path if EEPROM config tells us the