ARM: AT91: Add the ADC to the sam9g20ek board

This patch adds platform data for the AT91 ADC driver support for
the AT91SAM9G20-EK board.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 112 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/at91sam9260.c b/arch/arm/mach-at91/at91sam9260.c
index 46f774233298..63d4432960a9 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 5652dde4bbe2..be0eb2642439 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 8923ec9f5831..291b0fe9172f 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) */