Merge tag 'auxdisplay-v6.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-auxdisplay

Pull auxdisplay updates from Andy Shevchenko:

 - New driver for GPIO based 7-segment LED display (Chris Packham)

 - New driver for Maxim MAX6958/6959 I²C 7-segment LED display
   controller

 - Refactor linedisp library to make the above happen

 - Update Holtek HT16k33 driver to follow the linedisp refactoring

 - Convert .remove to return void in platform drivers (Uwe Kleine-König)

 - Fix DT schemas (Krzysztof Kozlowski)

 - Refresh MAINTAINERS database

* tag 'auxdisplay-v6.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-auxdisplay: (27 commits)
  auxdisplay: img-ascii-lcd: Convert to platform remove callback returning void
  auxdisplay: hd44780: Convert to platform remove callback returning void
  auxdisplay: cfag12864bfb: Convert to platform remove callback returning void
  auxdisplay: seg-led-gpio: Import linedisp namespace
  dt-bindings: auxdisplay: Add bindings for generic 7-segment LED
  auxdisplay: Add 7-segment LED display driver
  auxdisplay: Add driver for MAX695x 7-segment LED controllers
  dt-bindings: auxdisplay: Add Maxim MAX6958/6959
  auxdisplay: ht16k33: Drop struct ht16k33_seg
  auxdisplay: ht16k33: Switch to use line display character mapping
  auxdisplay: ht16k33: Define a few helper macros
  auxdisplay: ht16k33: Move ht16k33_linedisp_ops down
  auxdisplay: ht16k33: Add default to switch-cases
  auxdisplay: linedisp: Allocate buffer for the string
  auxdisplay: linedisp: Add support for overriding character mapping
  auxdisplay: linedisp: Provide struct linedisp_ops for future extension
  auxdisplay: linedisp: Move exported symbols to a namespace
  auxdisplay: linedisp: Add missing header(s)
  auxdisplay: linedisp: Unshadow error codes in ->store()
  auxdisplay: linedisp: Use unique number for id
  ...

6 files changed, 165 insertions, 64 deletions

diff --git a/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml b/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml
index 5d02bd032a85..439f7b811a94 100644
--- a/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml
+++ b/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml
@@ -39,6 +39,6 @@ additionalProperties: false
 examples:
   - |
     lcd@10008000 {
-            compatible = "arm,versatile-lcd";
-            reg = <0x10008000 0x1000>;
+        compatible = "arm,versatile-lcd";
+        reg = <0x10008000 0x1000>;
     };
diff --git a/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml b/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
new file mode 100644
index 000000000000..328954893c64
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/gpio-7-segment.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO based LED segment display
+
+maintainers:
+  - Chris Packham <chris.packham@alliedtelesis.co.nz>
+
+properties:
+  compatible:
+    const: gpio-7-segment
+
+  segment-gpios:
+    description: |
+      An array of GPIOs one per segment. The first GPIO corresponds to the A
+      segment, the seventh GPIO corresponds to the G segment. Some LED blocks
+      also have a decimal point which can be specified as an optional eighth
+      segment.
+
+               -a-
+              |   |
+              f   b
+              |   |
+               -g-
+              |   |
+              e   c
+              |   |
+               -d-  dp
+
+    minItems: 7
+    maxItems: 8
+
+required:
+  - segment-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/gpio/gpio.h>
+
+    led-7seg {
+        compatible = "gpio-7-segment";
+        segment-gpios = <&gpio 0 GPIO_ACTIVE_LOW>,
+                        <&gpio 1 GPIO_ACTIVE_LOW>,
+                        <&gpio 2 GPIO_ACTIVE_LOW>,
+                        <&gpio 3 GPIO_ACTIVE_LOW>,
+                        <&gpio 4 GPIO_ACTIVE_LOW>,
+                        <&gpio 5 GPIO_ACTIVE_LOW>,
+                        <&gpio 6 GPIO_ACTIVE_LOW>;
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
index 406a922a714e..3ca0e9863d83 100644
--- a/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
+++ b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
@@ -84,42 +84,44 @@ additionalProperties: false
 examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
-    auxdisplay {
-            compatible = "hit,hd44780";
-
-            data-gpios = <&hc595 0 GPIO_ACTIVE_HIGH>,
-                         <&hc595 1 GPIO_ACTIVE_HIGH>,
-                         <&hc595 2 GPIO_ACTIVE_HIGH>,
-                         <&hc595 3 GPIO_ACTIVE_HIGH>;
-            enable-gpios = <&hc595 4 GPIO_ACTIVE_HIGH>;
-            rs-gpios = <&hc595 5 GPIO_ACTIVE_HIGH>;
-
-            display-height-chars = <2>;
-            display-width-chars = <16>;
+    display-controller {
+        compatible = "hit,hd44780";
+
+        data-gpios = <&hc595 0 GPIO_ACTIVE_HIGH>,
+                     <&hc595 1 GPIO_ACTIVE_HIGH>,
+                     <&hc595 2 GPIO_ACTIVE_HIGH>,
+                     <&hc595 3 GPIO_ACTIVE_HIGH>;
+        enable-gpios = <&hc595 4 GPIO_ACTIVE_HIGH>;
+        rs-gpios = <&hc595 5 GPIO_ACTIVE_HIGH>;
+
+        display-height-chars = <2>;
+        display-width-chars = <16>;
     };
+
   - |
     #include <dt-bindings/gpio/gpio.h>
     i2c {
-            #address-cells = <1>;
-            #size-cells = <0>;
-
-            pcf8574: pcf8574@27 {
-                    compatible = "nxp,pcf8574";
-                    reg = <0x27>;
-                    gpio-controller;
-                    #gpio-cells = <2>;
-            };
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pcf8574: gpio-expander@27 {
+            compatible = "nxp,pcf8574";
+            reg = <0x27>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
     };
-    hd44780 {
-            compatible = "hit,hd44780";
-            display-height-chars = <2>;
-            display-width-chars = <16>;
-            data-gpios = <&pcf8574 4 0>,
-                         <&pcf8574 5 0>,
-                         <&pcf8574 6 0>,
-                         <&pcf8574 7 0>;
-            enable-gpios = <&pcf8574 2 0>;
-            rs-gpios = <&pcf8574 0 0>;
-            rw-gpios = <&pcf8574 1 0>;
-            backlight-gpios = <&pcf8574 3 0>;
+
+    display-controller {
+        compatible = "hit,hd44780";
+        display-height-chars = <2>;
+        display-width-chars = <16>;
+        data-gpios = <&pcf8574 4 GPIO_ACTIVE_HIGH>,
+                     <&pcf8574 5 GPIO_ACTIVE_HIGH>,
+                     <&pcf8574 6 GPIO_ACTIVE_HIGH>,
+                     <&pcf8574 7 GPIO_ACTIVE_HIGH>;
+        enable-gpios = <&pcf8574 2 GPIO_ACTIVE_HIGH>;
+        rs-gpios = <&pcf8574 0 GPIO_ACTIVE_HIGH>;
+        rw-gpios = <&pcf8574 1 GPIO_ACTIVE_HIGH>;
+        backlight-gpios = <&pcf8574 3 GPIO_ACTIVE_HIGH>;
     };
diff --git a/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml b/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
index be95f6b97b41..b90eec2077b4 100644
--- a/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
+++ b/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
@@ -74,31 +74,31 @@ examples:
     #include <dt-bindings/input/input.h>
     #include <dt-bindings/leds/common.h>
     i2c {
-            #address-cells = <1>;
-            #size-cells = <0>;
-
-            ht16k33: ht16k33@70 {
-                    compatible = "holtek,ht16k33";
-                    reg = <0x70>;
-                    refresh-rate-hz = <20>;
-                    interrupt-parent = <&gpio4>;
-                    interrupts = <5 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
-                    debounce-delay-ms = <50>;
-                    linux,keymap = <MATRIX_KEY(2, 0, KEY_F6)>,
-                                   <MATRIX_KEY(3, 0, KEY_F8)>,
-                                   <MATRIX_KEY(4, 0, KEY_F10)>,
-                                   <MATRIX_KEY(5, 0, KEY_F4)>,
-                                   <MATRIX_KEY(6, 0, KEY_F2)>,
-                                   <MATRIX_KEY(2, 1, KEY_F5)>,
-                                   <MATRIX_KEY(3, 1, KEY_F7)>,
-                                   <MATRIX_KEY(4, 1, KEY_F9)>,
-                                   <MATRIX_KEY(5, 1, KEY_F3)>,
-                                   <MATRIX_KEY(6, 1, KEY_F1)>;
-
-                    led {
-                            color = <LED_COLOR_ID_RED>;
-                            function = LED_FUNCTION_BACKLIGHT;
-                            linux,default-trigger = "backlight";
-                    };
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display-controller@70 {
+            compatible = "holtek,ht16k33";
+            reg = <0x70>;
+            refresh-rate-hz = <20>;
+            interrupt-parent = <&gpio4>;
+            interrupts = <5 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
+            debounce-delay-ms = <50>;
+            linux,keymap = <MATRIX_KEY(2, 0, KEY_F6)>,
+                           <MATRIX_KEY(3, 0, KEY_F8)>,
+                           <MATRIX_KEY(4, 0, KEY_F10)>,
+                           <MATRIX_KEY(5, 0, KEY_F4)>,
+                           <MATRIX_KEY(6, 0, KEY_F2)>,
+                           <MATRIX_KEY(2, 1, KEY_F5)>,
+                           <MATRIX_KEY(3, 1, KEY_F7)>,
+                           <MATRIX_KEY(4, 1, KEY_F9)>,
+                           <MATRIX_KEY(5, 1, KEY_F3)>,
+                           <MATRIX_KEY(6, 1, KEY_F1)>;
+
+            led {
+                color = <LED_COLOR_ID_RED>;
+                function = LED_FUNCTION_BACKLIGHT;
+                linux,default-trigger = "backlight";
             };
-      };
+        };
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml b/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml
index 1899b23de7d1..55e9831b3f67 100644
--- a/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml
+++ b/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml
@@ -50,6 +50,6 @@ additionalProperties: false
 examples:
   - |
     lcd: lcd@17fff000 {
-            compatible = "img,boston-lcd";
-            reg = <0x17fff000 0x8>;
+        compatible = "img,boston-lcd";
+        reg = <0x17fff000 0x8>;
     };
diff --git a/Documentation/devicetree/bindings/auxdisplay/maxim,max6959.yaml b/Documentation/devicetree/bindings/auxdisplay/maxim,max6959.yaml
new file mode 100644
index 000000000000..20dd9e8c8190
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/maxim,max6959.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/maxim,max6959.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MAX6958/6959 7-segment LED display controller
+
+maintainers:
+  - Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+
+description:
+  The Maxim MAX6958/6959 7-segment LED display controller provides
+  an I2C interface to up to four 7-segment LED digits. The MAX6959,
+  in comparison to MAX6958, adds input support. Type of the chip can
+  be autodetected via specific register read, and hence the features
+  may be enabled in the driver at run-time, in case they are requested
+  via Device Tree. A given hardware is simple and does not provide
+  any additional pins, such as reset or power enable.
+
+properties:
+  compatible:
+    const: maxim,max6959
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display-controller@38 {
+            compatible = "maxim,max6959";
+            reg = <0x38>;
+        };
+    };