iio: at91: introduce the multiple compatible string for different IPs.

As use the multiple compatible string, we can remove hardware register in dt.

CC: devicetree@vger.kernel.org
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 52 insertions, 43 deletions

diff --git a/Documentation/devicetree/bindings/arm/atmel-adc.txt b/Documentation/devicetree/bindings/arm/atmel-adc.txt
index 16769d9cedd6..723c205cb10d 100644
--- a/Documentation/devicetree/bindings/arm/atmel-adc.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-adc.txt
@@ -1,18 +1,15 @@
 * AT91's Analog to Digital Converter (ADC)
 
 Required properties:
-  - compatible: Should be "atmel,at91sam9260-adc"
+  - compatible: Should be "atmel,<chip>-adc"
+    <chip> can be "at91sam9260", "at91sam9g45" or "at91sam9x5"
   - reg: Should contain ADC registers location and length
   - interrupts: Should contain the IRQ line for the ADC
-  - atmel,adc-channel-base: Offset of the first channel data register
   - atmel,adc-channels-used: Bitmask of the channels muxed and enable for this
     device
-  - atmel,adc-drdy-mask: Mask of the DRDY interruption in the ADC
   - atmel,adc-num-channels: Number of channels available in the ADC
   - atmel,adc-startup-time: Startup Time of the ADC in microseconds as
     defined in the datasheet
-  - atmel,adc-status-register: Offset of the Interrupt Status Register
-  - atmel,adc-trigger-register: Offset of the Trigger Register
   - atmel,adc-vref: Reference voltage in millivolts for the conversions
   - atmel,adc-res: List of resolution in bits supported by the ADC. List size
                    must be two at least.
diff --git a/arch/arm/mach-at91/include/mach/at91_adc.h b/arch/arm/mach-at91/include/mach/at91_adc.h
index 8e7ed5c90817..bea1a2021d1e 100644
--- a/arch/arm/mach-at91/include/mach/at91_adc.h
+++ b/arch/arm/mach-at91/include/mach/at91_adc.h
@@ -48,6 +48,9 @@
 #define         AT91_ADC_ENDRX          (1 << 18)       /* End of RX Buffer */
 #define         AT91_ADC_RXFUFF         (1 << 19)       /* RX Buffer Full */
 
+#define AT91_ADC_SR_9X5         0x30            /* Status Register for 9x5 */
+#define         AT91_ADC_SR_DRDY_9X5    (1 << 24)       /* Data Ready */
+
 #define AT91_ADC_LCDR           0x20            /* Last Converted Data Register */
 #define         AT91_ADC_LDATA          (0x3ff)
 
@@ -58,4 +61,10 @@
 #define AT91_ADC_CHR(n)         (0x30 + ((n) * 4))      /* Channel Data Register N */
 #define         AT91_ADC_DATA           (0x3ff)
 
+#define AT91_ADC_CDR0_9X5       (0x50)                  /* Channel Data Register 0 for 9X5 */
+
+#define AT91_ADC_TRGR_9260      AT91_ADC_MR
+#define AT91_ADC_TRGR_9G45      0x08
+#define AT91_ADC_TRGR_9X5       0xC0
+
 #endif
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 423e079460d3..ed5eebc93bb7 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -39,6 +39,10 @@
 #define at91_adc_writel(st, reg, val) \
         (writel_relaxed(val, st->reg_base + reg))
 
+struct at91_adc_caps {
+        struct at91_adc_reg_desc registers;
+};
+
 struct at91_adc_state {
         struct clk              *adc_clk;
         u16                     *buffer;
@@ -62,6 +66,7 @@ struct at91_adc_state {
         u32                     res;            /* resolution used for convertions */
         bool                    low_res;        /* the resolution corresponds to the lowest one */
         wait_queue_head_t       wq_data_avail;
+        struct at91_adc_caps    *caps;
 };
 
 static irqreturn_t at91_adc_trigger_handler(int irq, void *p)
@@ -429,6 +434,8 @@ ret:
         return ret;
 }
 
+static const struct of_device_id at91_adc_dt_ids[];
+
 static int at91_adc_probe_dt(struct at91_adc_state *st,
                              struct platform_device *pdev)
 {
@@ -441,6 +448,9 @@ static int at91_adc_probe_dt(struct at91_adc_state *st,
         if (!node)
                 return -EINVAL;
 
+        st->caps = (struct at91_adc_caps *)
+                of_match_device(at91_adc_dt_ids, &pdev->dev)->data;
+
         st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
 
         if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) {
@@ -481,43 +491,7 @@ static int at91_adc_probe_dt(struct at91_adc_state *st,
         if (ret)
                 goto error_ret;
 
-        st->registers = devm_kzalloc(&idev->dev,
-                                     sizeof(struct at91_adc_reg_desc),
-                                     GFP_KERNEL);
-        if (!st->registers) {
-                dev_err(&idev->dev, "Could not allocate register memory.\n");
-                ret = -ENOMEM;
-                goto error_ret;
-        }
-
-        if (of_property_read_u32(node, "atmel,adc-channel-base", &prop)) {
-                dev_err(&idev->dev, "Missing adc-channel-base property in the DT.\n");
-                ret = -EINVAL;
-                goto error_ret;
-        }
-        st->registers->channel_base = prop;
-
-        if (of_property_read_u32(node, "atmel,adc-drdy-mask", &prop)) {
-                dev_err(&idev->dev, "Missing adc-drdy-mask property in the DT.\n");
-                ret = -EINVAL;
-                goto error_ret;
-        }
-        st->registers->drdy_mask = prop;
-
-        if (of_property_read_u32(node, "atmel,adc-status-register", &prop)) {
-                dev_err(&idev->dev, "Missing adc-status-register property in the DT.\n");
-                ret = -EINVAL;
-                goto error_ret;
-        }
-        st->registers->status_register = prop;
-
-        if (of_property_read_u32(node, "atmel,adc-trigger-register", &prop)) {
-                dev_err(&idev->dev, "Missing adc-trigger-register property in the DT.\n");
-                ret = -EINVAL;
-                goto error_ret;
-        }
-        st->registers->trigger_register = prop;
-
+        st->registers = &st->caps->registers;
         st->trigger_number = of_get_child_count(node);
         st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number *
                                         sizeof(struct at91_adc_trigger),
@@ -766,8 +740,37 @@ static int at91_adc_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_OF
+static struct at91_adc_caps at91sam9260_caps = {
+        .registers = {
+                .channel_base = AT91_ADC_CHR(0),
+                .drdy_mask = AT91_ADC_DRDY,
+                .status_register = AT91_ADC_SR,
+                .trigger_register = AT91_ADC_TRGR_9260,
+        },
+};
+
+static struct at91_adc_caps at91sam9g45_caps = {
+        .registers = {
+                .channel_base = AT91_ADC_CHR(0),
+                .drdy_mask = AT91_ADC_DRDY,
+                .status_register = AT91_ADC_SR,
+                .trigger_register = AT91_ADC_TRGR_9G45,
+        },
+};
+
+static struct at91_adc_caps at91sam9x5_caps = {
+        .registers = {
+                .channel_base = AT91_ADC_CDR0_9X5,
+                .drdy_mask = AT91_ADC_SR_DRDY_9X5,
+                .status_register = AT91_ADC_SR_9X5,
+                .trigger_register = AT91_ADC_TRGR_9X5,
+        },
+};
+
 static const struct of_device_id at91_adc_dt_ids[] = {
-        { .compatible = "atmel,at91sam9260-adc" },
+        { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps },
+        { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps },
+        { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps },
         {},
 };
 MODULE_DEVICE_TABLE(of, at91_adc_dt_ids);