This patch adds platform data for the AT91 ADC driver support for
the AT91SAM9G20-EK board.
Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
---
arch/arm/mach-at91/at91sam9260.c | 8 +++
arch/arm/mach-at91/at91sam9260_devices.c | 90 ++++++++++++++++++++++++++++++
arch/arm/mach-at91/board-sam9g20ek.c | 14 +++++
3 files changed, 112 insertions(+)
diff --git a/arch/arm/mach-at91/at91sam9260.c b/arch/arm/mach-at91/at91sam9260.c
index 46f7742..63d4432 100644
--- a/arch/arm/mach-at91/at91sam9260.c
+++ b/arch/arm/mach-at91/at91sam9260.c
@@ -55,6 +55,13 @@ static struct clk adc_clk = {
.pmc_mask = 1 << AT91SAM9260_ID_ADC,
.type = CLK_TYPE_PERIPHERAL,
};
+
+static struct clk adc_op_clk = {
+ .name = "adc_op_clk",
+ .type = CLK_TYPE_PERIPHERAL,
+ .rate_hz = 5000000,
+};
+
static struct clk usart0_clk = {
.name = "usart0_clk",
.pmc_mask = 1 << AT91SAM9260_ID_US0,
@@ -166,6 +173,7 @@ static struct clk *periph_clocks[] __initdata = {
&pioB_clk,
&pioC_clk,
&adc_clk,
+ &adc_op_clk,
&usart0_clk,
&usart1_clk,
&usart2_clk,
diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 5652dde..be0eb26 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -17,12 +17,15 @@
#include <linux/platform_device.h>
#include <linux/i2c-gpio.h>
+#include <linux/platform_data/at91_adc.h>
+
#include <mach/board.h>
#include <mach/cpu.h>
#include <mach/at91sam9260.h>
#include <mach/at91sam9260_matrix.h>
#include <mach/at91_matrix.h>
#include <mach/at91sam9_smc.h>
+#include <mach/at91_adc.h>
#include "generic.h"
@@ -1369,6 +1372,93 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
void __init at91_add_device_cf(struct at91_cf_data * data) {}
#endif
+/* --------------------------------------------------------------------
+ * ADCs
+ * -------------------------------------------------------------------- */
+
+#if IS_ENABLED(CONFIG_AT91_ADC)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+ [0] = {
+ .start = AT91SAM9260_BASE_ADC,
+ .end = AT91SAM9260_BASE_ADC + SZ_16K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = AT91SAM9260_ID_ADC,
+ .end = AT91SAM9260_ID_ADC,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device at91_adc_device = {
+ .name = "at91_adc",
+ .id = -1,
+ .dev = {
+ .platform_data = &adc_data,
+ },
+ .resource = adc_resources,
+ .num_resources = ARRAY_SIZE(adc_resources),
+};
+
+static struct at91_adc_trigger at91_adc_triggers[] = {
+ [0] = {
+ .name = "timer-counter-0",
+ .value = AT91_ADC_TRGSEL_TC0 | AT91_ADC_TRGEN,
+ },
+ [1] = {
+ .name = "timer-counter-1",
+ .value = AT91_ADC_TRGSEL_TC1 | AT91_ADC_TRGEN,
+ },
+ [2] = {
+ .name = "timer-counter-2",
+ .value = AT91_ADC_TRGSEL_TC2 | AT91_ADC_TRGEN,
+ },
+ [3] = {
+ .name = "external",
+ .value = AT91_ADC_TRGSEL_EXTERNAL | AT91_ADC_TRGEN,
+ .is_external = true,
+ },
+};
+
+static struct at91_adc_reg_desc at91_adc_register_g20 = {
+ .channel_base = AT91_ADC_CHR(0),
+ .drdy_mask = AT91_ADC_DRDY,
+ .status_register = AT91_ADC_SR,
+ .trigger_register = AT91_ADC_MR,
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+ if (!data)
+ return;
+
+ if (test_bit(0, &data->channels_used))
+ at91_set_A_periph(AT91_PIN_PC0, 0);
+ if (test_bit(1, &data->channels_used))
+ at91_set_A_periph(AT91_PIN_PC1, 0);
+ if (test_bit(2, &data->channels_used))
+ at91_set_A_periph(AT91_PIN_PC2, 0);
+ if (test_bit(3, &data->channels_used))
+ at91_set_A_periph(AT91_PIN_PC3, 0);
+
+ if (data->use_external_triggers)
+ at91_set_A_periph(AT91_PIN_PA22, 0);
+
+ data->num_channels = 4;
+ data->startup_time = 10;
+ data->registers = &at91_adc_register_g20;
+ data->trigger_number = 4;
+ data->trigger_list = at91_adc_triggers;
+
+ adc_data = *data;
+ platform_device_register(&at91_adc_device);
+}
+#else
+void __init at91_add_device_adc(struct at91_adc_data *data) {}
+#endif
+
/* -------------------------------------------------------------------- */
/*
* These devices are always present and don't need any board-specific
diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index 8923ec9..291b0fe 100644
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -32,6 +32,8 @@
#include <linux/regulator/fixed.h>
#include <linux/regulator/consumer.h>
+#include <linux/platform_data/at91_adc.h>
+
#include <mach/hardware.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
@@ -318,6 +320,16 @@ static void __init ek_add_device_buttons(void)
static void __init ek_add_device_buttons(void) {}
#endif
+/*
+ * ADCs
+ */
+
+static struct at91_adc_data ek_adc_data = {
+ .channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
+ .use_external_triggers = true,
+ .vref = 3300,
+};
+
#if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
REGULATOR_SUPPLY("AVDD", "0-001b"),
@@ -393,6 +405,8 @@ static void __init ek_board_init(void)
ek_add_device_gpio_leds();
/* Push Buttons */
ek_add_device_buttons();
+ /* ADCs */
+ at91_add_device_adc(&ek_adc_data);
/* PCK0 provides MCLK to the WM8731 */
at91_set_B_periph(AT91_PIN_PC1, 0);
/* SSC (for WM8731) */
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
