Hello Simon,
Am 30.08.2020 um 01:31 schrieb Simon Glass:
Many I2C devices produce roughly the same ACPI data with just things like
the GPIO/interrupt information being different.
This can be handled by a generic driver along with some information in the
device tree.
Add a generic i2c driver for this purpose.
Signed-off-by: Simon Glass <s...@chromium.org>
---
(no changes since v1)
Changes in v1:
- Adjust implementation to match new ACPI GPIO generation
- Capitalise ACPI_OPS_PTR
- Rename acpi-probed to linux,probed
- Support hid-over-i2c separately as well
- Use acpi,ddn instead of acpi,desc
- Use updated acpi_device_write_dsm_i2c_hid() function
doc/device-tree-bindings/i2c/generic-acpi.txt | 42 ++++
drivers/i2c/Makefile | 3 +
drivers/i2c/acpi_i2c.c | 226 ++++++++++++++++++
drivers/i2c/acpi_i2c.h | 15 ++
drivers/i2c/i2c-uclass.c | 17 ++
include/acpi/acpi_device.h | 55 +++++
include/i2c.h | 23 ++
7 files changed, 381 insertions(+)
create mode 100644 doc/device-tree-bindings/i2c/generic-acpi.txt
create mode 100644 drivers/i2c/acpi_i2c.c
create mode 100644 drivers/i2c/acpi_i2c.h
diff --git a/doc/device-tree-bindings/i2c/generic-acpi.txt
b/doc/device-tree-bindings/i2c/generic-acpi.txt
new file mode 100644
index 00000000000..f6fc1614ecf
--- /dev/null
+++ b/doc/device-tree-bindings/i2c/generic-acpi.txt
@@ -0,0 +1,42 @@
+I2C generic device
+==================
+
+This is used only to generate ACPI tables for an I2C device.
+
+Required properties :
+
+ - compatible : "i2c-chip";
+ - reg : I2C chip address
+ - acpi,hid : HID name for the device
+
+Optional properies in addition to device.txt:
+
+ - reset-gpios : GPIO used to assert reset to the device
+ - irq-gpios : GPIO used for interrupt (if Interrupt is not used)
+ - stop-gpios : GPIO used to stop the device
+ - interrupts-extended : Interrupt to use for the device
+ - reset-delay-ms : Delay after de-asserting reset, in ms
+ - reset-off-delay-ms : Delay after asserting reset (during power off)
+ - enable-delay-ms : Delay after asserting enable
+ - enable-off-delay-m s: Delay after de-asserting enable (during power off)
typo s/m s/ms
+ - stop-delay-ms : Delay after de-aserting stop
+ - stop-off-delay-ms : Delay after asserting stop (during power off)
+ - hid-descr-addr : HID register offset (for Human Interface Devices)
[...]
Beside of the typo, you can add my
Reviewed-by: Heiko Schocher <h...@denx.de>
bye,
Heiko
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