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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
View file

@ -412,4 +412,13 @@ config IHS_FPGA
by the devices. This driver supports both CON and CPU variants of the
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

1
drivers/misc/Makefile
View file

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

64
drivers/misc/microchip_flexcom.c Normal file
View file

@ -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),
};