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ODROID-COMMON: mcp251x: CAN bus driver modified to use gpio irq.

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Change-Id: I2c10f197558d8c1f62e1371a7f7f510688bbedc2
Signed-off-by: femto <ckkim@hardkernel.com>
This commit is contained in:
femto
2019-12-03 17:59:24 +09:00
committed by Dongjin Kim
parent 1e396a3bc4
commit 15639b4123
2 changed files with 47 additions and 0 deletions
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8
arch/arm64/boot/dts/amlogic/meson64_odroidn2.dts
View File

@@ -770,6 +770,14 @@
cs-gpios = <&gpio GPIOX_10 GPIO_ACTIVE_LOW>,
<&gpio GPIOA_4 GPIO_ACTIVE_LOW>;
can0: can@0 {
compatible = "microchip,mcp2515";
reg = <0>;
spi-max-frequency = <10000000>;
status = "disabled";
gpio-irq = <&gpio GPIOX_3 GPIO_ACTIVE_LOW>;
};
spidev@0 {
status = "disabled";

39
drivers/net/can/spi/mcp251x.c
View File

@@ -77,6 +77,11 @@
#include <linux/uaccess.h>
#include <linux/regulator/consumer.h>
#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#endif
/* SPI interface instruction set */
#define INSTRUCTION_WRITE 0x02
#define INSTRUCTION_READ 0x03
@@ -282,6 +287,29 @@ static inline int mcp251x_is_##_model(struct spi_device *spi) \
MCP251X_IS(2510);
MCP251X_IS(2515);
#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
static unsigned int gpio_irq;
int odroidg12_irq_init(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct device_node *np;
int ret = 0;
np = dev->of_node;
gpio_irq = of_get_named_gpio(np, "gpio-irq", 0);
if (!gpio_is_valid(gpio_irq))
return -EINVAL;
if (gpio_request(gpio_irq, "can_irq_gpio") != 0) {
gpio_free(gpio_irq);
return -EIO;
}
gpio_direction_input(gpio_irq);
spi->irq = gpio_to_irq(gpio_irq);
return ret;
}
#endif
static void mcp251x_clean(struct net_device *net)
{
struct mcp251x_priv *priv = netdev_priv(net);
@@ -1039,7 +1067,11 @@ static int mcp251x_can_probe(struct spi_device *spi)
if (pdata)
freq = pdata->oscillator_frequency;
else
#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
freq = spi->max_speed_hz;
#else
return PTR_ERR(clk);
#endif
} else {
freq = clk_get_rate(clk);
}
@@ -1151,6 +1183,9 @@ static int mcp251x_can_probe(struct spi_device *spi)
goto error_probe;
}
#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
odroidg12_irq_init(spi);
#endif
mcp251x_hw_sleep(spi);
ret = register_candev(net);
@@ -1190,6 +1225,10 @@ static int mcp251x_can_remove(struct spi_device *spi)
free_candev(net);
#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
if (gpio_is_valid(gpio_irq))
gpio_free(gpio_irq);
#endif
return 0;
}