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

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>

diff --git a/board/gateworks/gw_ventana/common.c b/board/gateworks/gw_ventana/common.c
index 7610381184eafd627fae43130da0c50e2389e123..44ee73f13d49f6583172b28756fe0afcbfbc9d8e 100644 (file)
--- a/board/gateworks/gw_ventana/common.c
+++ b/board/gateworks/gw_ventana/common.c
@@ -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] |

diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 7a3d96a039c1adf1ea4cd36a2295931c1569e2d4..feb2df8fa1b975692b5d097fabc06af830f40a95 100644 (file)
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -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