[U-Boot] [PATCH 18/18] imx: ventana: add fdt fixup to enable UHS-I support on selected boards
Tim Harvey
tharvey at gateworks.com
Tue May 24 20:03:59 CEST 2016
UHS-I support is available on Ventana boards with micro-SD sockets depending
on the board revision. For backwards compatibility to not break users
who have old bootloaders and newer kernels the device-tree on boards with
microSD disables UHS-I support by default by defining the no-1-8-v property
in the esdhc controller node. For models/revisions that support switchable
1.8V/3.3V I/O which is detectable by the presence of a pull-down on the
SD3_VSELECT pin we remove that property to enable support in the kernel.
Additionally we add SD3_VSELECT to the pinmux for clarity (even though U-Boot
does not currently support UHS-I modes requiring 1.8V I/O).
Signed-off-by: Tim Harvey <tharvey at gateworks.com>
---
board/gateworks/gw_ventana/common.c | 7 +++++++
board/gateworks/gw_ventana/common.h | 2 ++
board/gateworks/gw_ventana/gw_ventana.c | 26 ++++++++++++++++++++++++--
3 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/board/gateworks/gw_ventana/common.c b/board/gateworks/gw_ventana/common.c
index 2c3ac93..929dde9 100644
--- a/board/gateworks/gw_ventana/common.c
+++ b/board/gateworks/gw_ventana/common.c
@@ -134,6 +134,8 @@ void setup_ventana_i2c(void)
static iomux_v3_cfg_t const gw_gpio_pads[] = {
/* RS232_EN# */
IOMUX_PADS(PAD_SD4_DAT3__GPIO2_IO11 | DIO_PAD_CFG),
+ /* SD3_VSELECT */
+ IOMUX_PADS(PAD_NANDF_CS1__GPIO6_IO14 | DIO_PAD_CFG),
};
/* prototype */
@@ -766,6 +768,11 @@ void setup_iomux_gpio(int board, struct ventana_board_info *info)
gpio_request(gpio_cfg[board].wdis, "wlan_dis");
gpio_direction_output(gpio_cfg[board].wdis, 1);
}
+
+ /* sense vselect pin to see if we support uhs-i */
+ gpio_request(GP_SD3_VSELECT, "sd3_vselect");
+ gpio_direction_input(GP_SD3_VSELECT);
+ gpio_cfg[board].usd_vsel = !gpio_get_value(GP_SD3_VSELECT);
}
/* setup GPIO pinmux and default configuration per baseboard and env */
diff --git a/board/gateworks/gw_ventana/common.h b/board/gateworks/gw_ventana/common.h
index 58ad5ff..d037767 100644
--- a/board/gateworks/gw_ventana/common.h
+++ b/board/gateworks/gw_ventana/common.h
@@ -17,6 +17,7 @@
#define GP_SD3_CD IMX_GPIO_NR(7, 0)
#define GP_RS232_EN IMX_GPIO_NR(2, 11)
#define GP_MSATA_SEL IMX_GPIO_NR(2, 8)
+#define GP_SD3_VSELECT IMX_GPIO_NR(6, 14)
#define UART_PAD_CTRL (PAD_CTL_PKE | PAD_CTL_PUE | \
PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED | \
@@ -77,6 +78,7 @@ struct ventana {
int usb_sel;
int wdis;
int msata_en;
+ bool usd_vsel;
};
extern struct ventana gpio_cfg[GW_UNKNOWN];
diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 15e4bf1..82313e8 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -60,8 +60,7 @@ static iomux_v3_cfg_t const usdhc3_pads[] = {
IOMUX_PADS(PAD_SD3_DAT1__SD3_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
IOMUX_PADS(PAD_SD3_DAT2__SD3_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
IOMUX_PADS(PAD_SD3_DAT3__SD3_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
- /* CD */
- IOMUX_PADS(PAD_SD3_DAT5__GPIO7_IO00 | MUX_PAD_CTRL(IRQ_PAD_CTRL)),
+ IOMUX_PADS(PAD_SD3_DAT5__GPIO7_IO00 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
};
/* ENET */
@@ -792,6 +791,17 @@ static inline void ft_enable_path(void *blob, const char *path)
}
}
+/* remove a property of a node if the node is found */
+static inline void ft_delprop_path(void *blob, const char *path,
+ const char *name)
+{
+ int i = fdt_path_offset(blob, path);
+ if (i) {
+ debug("removing %s/%s\n", path, name);
+ fdt_delprop(blob, i, name);
+ }
+}
+
/*
* called prior to booting kernel or by 'fdt boardsetup' command
*
@@ -895,6 +905,11 @@ int ft_board_setup(void *blob, bd_t *bd)
range[1] = cpu_to_fdt32(23);
}
}
+
+ /* these have broken usd_vsel */
+ if (strstr((const char *)info->model, "SP318-B") ||
+ strstr((const char *)info->model, "SP331-B"))
+ gpio_cfg[board_type].usd_vsel = 0;
}
/*
@@ -954,6 +969,13 @@ int ft_board_setup(void *blob, bd_t *bd)
}
}
+ /* remove no-1-8-v if UHS-I support is present */
+ if (gpio_cfg[board_type].usd_vsel) {
+ debug("Enabling UHS-I support\n");
+ ft_delprop_path(blob, "/soc/aips-bus at 02100000/usdhc at 02198000",
+ "no-1-8-v");
+ }
+
/*
* Peripheral Config:
* remove nodes by alias path if EEPROM config tells us the
--
1.9.1
More information about the U-Boot
mailing list