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misc: microchip_flexcom: introduce microchip_flexcom driver

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The Microchip Flexcom is just a wrapper which embeds a SPI controller,
an I2C controller and an USART.
Only one function can be used at a time and is chosen at boot time according
to the device tree.
The bindings are kept as in Linux.
The driver registers to MISC_UCLASS.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Eugen Hristev
2019-10-09 09:23:39 +00:00
parent 680023c5fa
commit f81649586d
3 changed files with 74 additions and 0 deletions
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9
drivers/misc/Kconfig
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@@ -412,4 +412,13 @@ config IHS_FPGA
by the devices. This driver supports both CON and CPU variants of the by the devices. This driver supports both CON and CPU variants of the
devices, depending on the device tree entry. devices, depending on the device tree entry.
config MICROCHIP_FLEXCOM
bool "Enable Microchip Flexcom driver"
depends on MISC
help
The Atmel Flexcom is just a wrapper which embeds a SPI controller,
an I2C controller and an USART.
Only one function can be used at a time and is chosen at boot time
according to the device tree.
endmenu endmenu

1
drivers/misc/Makefile
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@@ -65,3 +65,4 @@ obj-$(CONFIG_TWL4030_LED) += twl4030_led.o
obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress_config.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress_config.o
obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o
obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o
obj-$(CONFIG_MICROCHIP_FLEXCOM) += microchip_flexcom.o

64
drivers/misc/microchip_flexcom.c Normal file
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@@ -0,0 +1,64 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2019, Microchip Technology, Inc.
* Author: Eugen Hristev <eugen.hristev@microchip.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <misc.h>
#include <asm/io.h>
struct microchip_flexcom_regs {
u32 cr;
};
struct microchip_flexcom_platdata {
struct microchip_flexcom_regs *regs;
u32 flexcom_mode;
};
static int microchip_flexcom_ofdata_to_platdata(struct udevice *dev)
{
struct microchip_flexcom_platdata *plat = dev_get_platdata(dev);
int ret;
plat->regs = map_physmem(devfdt_get_addr(dev),
sizeof(struct microchip_flexcom_regs),
MAP_NOCACHE);
ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
if (IS_ERR_VALUE(ret)) {
debug("Missing atmel,flexcom-mode property\n");
return ret;
}
/*
* The mode must have only 2 bits. If any other bits are set,
* the value is not supported.
*/
if (plat->flexcom_mode & 0xfffffffc) {
debug("Wrong atmel,flexcom-mode property\n");
return -EINVAL;
}
writel(plat->flexcom_mode, &plat->regs->cr);
return 0;
}
static const struct udevice_id microchip_flexcom_ids[] = {
{ .compatible = "atmel,sama5d2-flexcom" },
{ .compatible = "microchip,flexcom" },
{}
};
U_BOOT_DRIVER(microchip_flexcom) = {
.name = "microchip_flexcom",
.id = UCLASS_MISC,
.of_match = microchip_flexcom_ids,
.ofdata_to_platdata = microchip_flexcom_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct microchip_flexcom_platdata),
};