2017-08-16 10:29:08

by Robin van der Gracht

Subject: [PATCH] auxdisplay: ht16k33: Keyscan function should be optional

keyscan should be optional to support simple LED matrix displays (output only).

Reported-by: Michael Kaplan <[email protected]>
Signed-off-by: Robin van der Gracht <[email protected]>
---

Documentation/devicetree/bindings/display/ht16k33.txt | 15 +++++++++------
drivers/auxdisplay/ht16k33.c | 14 ++++++--------
2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/ht16k33.txt b/Documentation/devicetree/bindings/display/ht16k33.txt
index 8e5b30b87754..e2c9048ed9d4 100644
--- a/Documentation/devicetree/bindings/display/ht16k33.txt
+++ b/Documentation/devicetree/bindings/display/ht16k33.txt
@@ -4,18 +4,21 @@ Holtek ht16k33 RAM mapping 16*8 LED controller driver with keyscan
Required properties:
- compatible: "holtek,ht16k33"
- reg: I2C slave address of the chip.
-- interrupt-parent: A phandle pointing to the interrupt controller
- serving the interrupt for this chip.
-- interrupts: Interrupt specification for the key pressed interrupt.
- refresh-rate-hz: Display update interval in HZ.
-- debounce-delay-ms: Debouncing interval time in milliseconds.
-- linux,keymap: The keymap for keys as described in the binding
- document (devicetree/bindings/input/matrix-keymap.txt).

Optional properties:
- linux,no-autorepeat: Disable keyrepeat.
- default-brightness-level: Initial brightness level [0-15] (default: 15).

+- Keypad
+ Supply the 'interrupts' property to enable the keyscan feature.
+ - interrupts: Interrupt specification for the key pressed interrupt.
+ - interrupt-parent: A phandle pointing to the interrupt controller
+ serving the interrupt for this chip.
+ - debounce-delay-ms: Debouncing interval time in milliseconds.
+ - linux,keymap: The keymap for keys as described in the binding
+ document (devicetree/bindings/input/matrix-keymap.txt).
+
Example:

&i2c1 {
diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index 674a6c0cec2a..14b268388ef9 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -410,11 +410,6 @@ static int ht16k33_probe(struct i2c_client *client,
return -EIO;
}

- if (client->irq <= 0) {
- dev_err(&client->dev, "No IRQ specified\n");
- return -EINVAL;
- }
-
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -468,9 +463,12 @@ static int ht16k33_probe(struct i2c_client *client,
if (err)
goto err_fbdev_info;

- err = ht16k33_keypad_probe(client, &priv->keypad);
- if (err)
- goto err_fbdev_unregister;
+ /* Keypad */
+ if (client->irq > 0) {
+ err = ht16k33_keypad_probe(client, &priv->keypad);
+ if (err)
+ goto err_fbdev_unregister;
+ }

/* Backlight */
memset(&bl_props, 0, sizeof(struct backlight_properties));
--
2.11.0

2017-08-17 22:07:30

by Rob Herring (Arm)

Subject: Re: [PATCH] auxdisplay: ht16k33: Keyscan function should be optional

On Wed, Aug 16, 2017 at 12:28:49PM +0200, Robin van der Gracht wrote:
> keyscan should be optional to support simple LED matrix displays (output only).
>
> Reported-by: Michael Kaplan <[email protected]>
> Signed-off-by: Robin van der Gracht <[email protected]>
> ---
>
> Documentation/devicetree/bindings/display/ht16k33.txt | 15 +++++++++------
> drivers/auxdisplay/ht16k33.c | 14 ++++++--------
> 2 files changed, 15 insertions(+), 14 deletions(-)

Acked-by: Rob Herring <[email protected]>