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drivers: CAN: MCP2515: Move OSC frequency definition to device-tree

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Move the oscillator frequency definition from Kconfig to device-tree.

Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>
This commit is contained in:
Alexander Wachter 2019-10-08 10:25:20 +02:00 • committed by Maureen Helm
commit 8b214117ec
6 changed files with 12 additions and 12 deletions
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1
boards/shields/link_board_can/link_board_can.overlay
View file

@ -19,6 +19,7 @@
label = "CAN_1";
reg = <0>;
bus-speed = <125000>;
osc-freq = <24000000>;
sjw = <1>;
prop-seg = <2>;
phase-seg1 = <7>;

6
drivers/can/Kconfig.mcp2515
View file

@ -14,12 +14,6 @@ config CAN_MCP2515
if CAN_MCP2515
config CAN_MCP2515_OSC_FREQ
int "Oscillator frequency"
default 8000000
help
Specify the frequency of the oscillator connected to the MCP2515.
config CAN_MCP2515_INT_THREAD_STACK_SIZE
int "Stack size for interrupt handler"
default 512

8
drivers/can/can_mcp2515.c
View file

@ -193,8 +193,7 @@ static int mcp2515_configure(struct device *dev, enum can_mode mode,
dev_cfg->tq_bs2;
/* CNF1; SJW<7:6> | BRP<5:0> */
u8_t brp =
(CONFIG_CAN_MCP2515_OSC_FREQ / (bit_length * bitrate * 2)) - 1;
u8_t brp = (dev_cfg->osc_freq / (bit_length * bitrate * 2)) - 1;
const u8_t sjw = (dev_cfg->tq_sjw - 1) << 6;
u8_t cnf1 = sjw | brp;
@ -238,12 +237,12 @@ static int mcp2515_configure(struct device *dev, enum can_mode mode,
"PROP + BS1 >= BS2");
__ASSERT(dev_cfg->tq_bs2 > dev_cfg->tq_sjw, "BS2 > SJW");
if (CONFIG_CAN_MCP2515_OSC_FREQ % (bit_length * bitrate * 2)) {
if (dev_cfg->osc_freq % (bit_length * bitrate * 2)) {
LOG_ERR("Prescaler is not a natural number! "
"prescaler = osc_rate / ((PROP + SEG1 + SEG2 + 1) "
"* bitrate * 2)\n"
"prescaler = %d / ((%d + %d + %d + 1) * %d * 2)",
CONFIG_CAN_MCP2515_OSC_FREQ, dev_cfg->tq_prop,
dev_cfg->osc_freq, dev_cfg->tq_prop,
dev_cfg->tq_bs1, dev_cfg->tq_bs2, bitrate);
}
@ -623,6 +622,7 @@ static const struct mcp2515_config mcp2515_config_1 = {
.tq_bs1 = DT_INST_0_MICROCHIP_MCP2515_PHASE_SEG1,
.tq_bs2 = DT_INST_0_MICROCHIP_MCP2515_PHASE_SEG2,
.bus_speed = DT_INST_0_MICROCHIP_MCP2515_BUS_SPEED,
.osc_freq = DT_INST_0_MICROCHIP_MCP2515_OSC_FREQ
};
DEVICE_AND_API_INIT(can_mcp2515_1, DT_INST_0_MICROCHIP_MCP2515_LABEL, &mcp2515_init,

1
drivers/can/can_mcp2515.h
View file

@ -72,6 +72,7 @@ struct mcp2515_config {
u8_t tq_bs1;
u8_t tq_bs2;
u32_t bus_speed;
u32_t osc_freq;
};
/* MCP2515 Opcodes */

4
dts/bindings/can/microchip,mcp2515.yaml
View file

@ -11,6 +11,10 @@ compatible: "microchip,mcp2515"
include: [spi-device.yaml, can-controller.yaml]
properties:
osc-freq:
type: int
required: true
description: Frequency of the external oscillator
int-gpios:
type: phandle-array
required: true

4
samples/drivers/CAN/mcp2515-dts.overlay
View file

@ -9,13 +9,13 @@
cs-gpios = <&gpioa 4 0>;
mcp2515@0 {
compatible = "microchip,mcp2515";
spi-port-name = "SPI_1";
spi-max-frequency = <1000000>;
int-gpios = <&gpioa 0 GPIO_INT_ACTIVE_LOW>;
status = "okay";
label = "CAN_1";
reg = <0>;
bus-speed = <250000>;
osc-freq = <8000000>;
bus-speed = <125000>;
sjw = <1>;
prop-seg = <2>;
phase-seg1 = <7>;