[PATCH] gpio: mcp230xx: Add support for models with SPI interface.
Piotr Wojtaszczyk
piotr.wojtaszczyk at timesys.com
Wed Mar 13 12:54:56 CET 2024
Signed-off-by: Piotr Wojtaszczyk <piotr.wojtaszczyk at timesys.com>
---
drivers/gpio/Kconfig | 3 +
drivers/gpio/Makefile | 2 +-
drivers/gpio/mcp230xx_gpio.c | 144 ++++++++++++++++++++++++++++++++++-
3 files changed, 144 insertions(+), 5 deletions(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 2df3dc42d0..a7fb1eb3f4 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -256,6 +256,9 @@ config MCP230XX_GPIO
- MCP23008
- MCP23017
- MCP23018
+ - MCP23S08
+ - MCP23S17
+ - MCP23S18
config MSCC_SGPIO
bool "Microsemi Serial GPIO driver"
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index da3da5da2b..90711702a6 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -23,7 +23,7 @@ obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o
obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o
obj-$(CONFIG_IPROC_GPIO) += iproc_gpio.o
obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
-obj-$(CONFIG_MCP230XX_GPIO) += mcp230xx_gpio.o
+obj-$(CONFIG_$(SPL_TPL_)MCP230XX_GPIO) += mcp230xx_gpio.o
obj-$(CONFIG_MXC_GPIO) += mxc_gpio.o
obj-$(CONFIG_MXS_GPIO) += mxs_gpio.o
obj-$(CONFIG_NPCM_GPIO) += npcm_gpio.o
diff --git a/drivers/gpio/mcp230xx_gpio.c b/drivers/gpio/mcp230xx_gpio.c
index 9f02fd42b3..df99fde566 100644
--- a/drivers/gpio/mcp230xx_gpio.c
+++ b/drivers/gpio/mcp230xx_gpio.c
@@ -11,6 +11,7 @@
#include <errno.h>
#include <dm.h>
#include <i2c.h>
+#include <spi.h>
#include <asm/gpio.h>
#include <dm/device_compat.h>
#include <dt-bindings/gpio/gpio.h>
@@ -20,6 +21,13 @@ enum mcp230xx_type {
MCP23008,
MCP23017,
MCP23018,
+ MCP23S08,
+ MCP23S17,
+ MCP23S18,
+};
+
+struct mcp230xx_info {
+ uint dev_addr;
};
#define MCP230XX_IODIR 0x00
@@ -29,29 +37,136 @@ enum mcp230xx_type {
#define BANKSIZE 8
+#define MCP230XX_ADDR 0x20
+
+static int mcp230xx_read_spi(struct udevice *dev, uint reg_addr)
+{
+ struct mcp230xx_info *info = dev_get_plat(dev);
+ uint dev_addr, value = 0;
+ int ret;
+
+ /* set R/W bit for reading */
+ dev_addr = (info->dev_addr << 1) | 1;
+
+ ret = dm_spi_claim_bus(dev);
+ if (ret)
+ return ret;
+
+ ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
+ if (ret < 0)
+ goto fail;
+ udelay(1);
+
+ ret = dm_spi_xfer(dev, 8, &dev_addr, NULL, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = dm_spi_xfer(dev, 8, ®_addr, NULL, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = dm_spi_xfer(dev, 8, NULL, &value, 0);
+
+fail:
+ dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
+ dm_spi_release_bus(dev);
+ if (ret < 0)
+ return ret;
+ return value;
+}
+
static int mcp230xx_read(struct udevice *dev, uint reg, uint offset)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int bank = offset / BANKSIZE;
int mask = 1 << (offset % BANKSIZE);
int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
- int ret;
+ int reg_addr = (reg << shift) | bank;
+ int ret = 0;
+
+ switch (dev_get_driver_data(dev)) {
+ case MCP23008:
+ case MCP23017:
+ case MCP23018:
+ ret = dm_i2c_reg_read(dev, reg_addr);
+ break;
+ case MCP23S08:
+ case MCP23S17:
+ case MCP23S18:
+ ret = mcp230xx_read_spi(dev, reg_addr);
+ break;
+ default:
+ return -ENODEV;
+ }
- ret = dm_i2c_reg_read(dev, (reg << shift) | bank);
if (ret < 0)
return ret;
return !!(ret & mask);
}
+static int mcp230xx_clrset_spi(struct udevice *dev, uint reg_addr, uint clr, uint set)
+{
+ struct mcp230xx_info *info = dev_get_plat(dev);
+ int dev_addr, value;
+ int ret;
+
+ /* R/W bit = 0 for writing */
+ dev_addr = (info->dev_addr << 1);
+
+ ret = mcp230xx_read_spi(dev, reg_addr);
+ if (ret < 0)
+ return ret;
+
+ value = ret;
+ value &= ~clr;
+ value |= set;
+
+ ret = dm_spi_claim_bus(dev);
+ if (ret)
+ return ret;
+
+ ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
+ if (ret < 0)
+ goto fail;
+ udelay(1);
+
+ ret = dm_spi_xfer(dev, 8, &dev_addr, NULL, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = dm_spi_xfer(dev, 8, ®_addr, NULL, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = dm_spi_xfer(dev, 8, &value, NULL, 0);
+
+fail:
+ dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
+ dm_spi_release_bus(dev);
+ return ret;
+}
+
static int mcp230xx_write(struct udevice *dev, uint reg, uint offset, bool val)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int bank = offset / BANKSIZE;
int mask = 1 << (offset % BANKSIZE);
int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
+ int reg_addr = (reg << shift) | bank;
- return dm_i2c_reg_clrset(dev, (reg << shift) | bank, mask, val ? mask : 0);
+ switch (dev_get_driver_data(dev)) {
+ case MCP23008:
+ case MCP23017:
+ case MCP23018:
+ return dm_i2c_reg_clrset(dev, reg_addr, mask, val ? mask : 0);
+ case MCP23S08:
+ case MCP23S17:
+ case MCP23S18:
+ return mcp230xx_clrset_spi(dev, reg_addr, mask, val ? mask : 0);
+ default:
+ return -ENODEV;
+ }
}
static int mcp230xx_get_value(struct udevice *dev, uint offset)
@@ -181,22 +296,37 @@ static const struct dm_gpio_ops mcp230xx_ops = {
static int mcp230xx_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- char name[32], label[8], *str;
+ struct mcp230xx_info *info = dev_get_plat(dev);
+ char name[32], label[32], *str;
int addr, gpio_count, size;
const u8 *tmp;
switch (dev_get_driver_data(dev)) {
case MCP23008:
+ case MCP23S08:
gpio_count = 8;
break;
case MCP23017:
case MCP23018:
+ case MCP23S17:
+ case MCP23S18:
gpio_count = 16;
break;
default:
return -ENODEV;
}
+ switch (dev_get_driver_data(dev)) {
+ case MCP23S08:
+ case MCP23S17:
+ case MCP23S18:
+ info->dev_addr = dev_read_u32_default(dev, "addr", MCP230XX_ADDR);
+ break;
+ default:
+ info->dev_addr = 0;
+ break;
+ }
+
addr = dev_read_addr(dev);
tmp = dev_read_prop(dev, "label", &size);
if (tmp) {
@@ -220,9 +350,14 @@ static int mcp230xx_probe(struct udevice *dev)
}
static const struct udevice_id mcp230xx_ids[] = {
+ /* i2c interface */
{ .compatible = "microchip,mcp23008", .data = MCP23008, },
{ .compatible = "microchip,mcp23017", .data = MCP23017, },
{ .compatible = "microchip,mcp23018", .data = MCP23018, },
+ /* spi interface */
+ { .compatible = "microchip,mcp23s08", .data = MCP23S08, },
+ { .compatible = "microchip,mcp23s17", .data = MCP23S17, },
+ { .compatible = "microchip,mcp23s18", .data = MCP23S18, },
{ }
};
@@ -231,5 +366,6 @@ U_BOOT_DRIVER(mcp230xx) = {
.id = UCLASS_GPIO,
.ops = &mcp230xx_ops,
.probe = mcp230xx_probe,
+ .plat_auto = sizeof(struct mcp230xx_info),
.of_match = mcp230xx_ids,
};
--
2.25.1
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