mfd: dln2: Add cell for initializing DLN2 ADC

commit 313c84b5ae4104e48c661d5d706f9f4c425fd50f upstream.

This patch extends the DLN2 driver; adding cell for adc_dln2 module.

The original patch[1] fell through the cracks when the driver was added
so ADC has never actually been usable. That patch did not have ACPI
support which was added in v5.9, so the oldest supported version this
current patch can be backported to is 5.10.

[1] https://www.spinics.net/lists/linux-iio/msg33975.html

Cc: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Jack Andersen <jackoalan@gmail.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211018112541.25466-1-noralf@tronnes.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
index 83e676a096dc11c724348537a184bd22c81c7332..852129ea076660f8dc4f495eece81fe8b5f0927c 100644 (file)
--- a/drivers/mfd/dln2.c
+++ b/drivers/mfd/dln2.c
@@ -50,6 +50,7 @@ enum dln2_handle {
        DLN2_HANDLE_GPIO,
        DLN2_HANDLE_I2C,
        DLN2_HANDLE_SPI,
+       DLN2_HANDLE_ADC,
        DLN2_HANDLES
 };
 
@@ -653,6 +654,7 @@ enum {
        DLN2_ACPI_MATCH_GPIO    = 0,
        DLN2_ACPI_MATCH_I2C     = 1,
        DLN2_ACPI_MATCH_SPI     = 2,
+       DLN2_ACPI_MATCH_ADC     = 3,
 };
 
 static struct dln2_platform_data dln2_pdata_gpio = {
@@ -683,6 +685,16 @@ static struct mfd_cell_acpi_match dln2_acpi_match_spi = {
        .adr = DLN2_ACPI_MATCH_SPI,
 };
 
+/* Only one ADC port supported */
+static struct dln2_platform_data dln2_pdata_adc = {
+       .handle = DLN2_HANDLE_ADC,
+       .port = 0,
+};
+
+static struct mfd_cell_acpi_match dln2_acpi_match_adc = {
+       .adr = DLN2_ACPI_MATCH_ADC,
+};
+
 static const struct mfd_cell dln2_devs[] = {
        {
                .name = "dln2-gpio",
@@ -702,6 +714,12 @@ static const struct mfd_cell dln2_devs[] = {
                .platform_data = &dln2_pdata_spi,
                .pdata_size = sizeof(struct dln2_platform_data),
        },
+       {
+               .name = "dln2-adc",
+               .acpi_match = &dln2_acpi_match_adc,
+               .platform_data = &dln2_pdata_adc,
+               .pdata_size = sizeof(struct dln2_platform_data),
+       },
 };
 
 static void dln2_stop(struct dln2_dev *dln2)