drm/sitronix/st7571-spi: add support for SPI interface

Add support for ST7561/ST7571 connected to SPI bus.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://patch.msgid.link/20251215-st7571-split-v3-6-d5f3205c3138@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index d4a6379812e40a194b68eeb634610797b4e11b5f..e6471d72bcc7576c8f48c3cb279df8cf7ad74f90 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8201,6 +8201,7 @@ S:        Maintained
 F:     Documentation/devicetree/bindings/display/sitronix,st7567.yaml
 F:     Documentation/devicetree/bindings/display/sitronix,st7571.yaml
 F:     drivers/gpu/drm/sitronix/st7571-i2c.c
+F:     drivers/gpu/drm/sitronix/st7571-spi.c
 F:     drivers/gpu/drm/sitronix/st7571.c
 F:     drivers/gpu/drm/sitronix/st7571.h
 

diff --git a/drivers/gpu/drm/sitronix/Kconfig b/drivers/gpu/drm/sitronix/Kconfig
index 203c53fff402588930750b823d7a7c63de78cb99..56f257e16d1c238453411ebe419231022560b193 100644 (file)
--- a/drivers/gpu/drm/sitronix/Kconfig
+++ b/drivers/gpu/drm/sitronix/Kconfig
@@ -27,6 +27,18 @@ config DRM_ST7571_I2C
 
          if M is selected the module will be called st7571-i2c.
 
+config DRM_ST7571_SPI
+       tristate "DRM support for Sitronix ST7567/ST7571 display panels (SPI)"
+       depends on DRM_ST7571 && SPI
+       select REGMAP_SPI
+       help
+         Sitronix ST7571 is a driver and controller for 4-level gray
+         scale and monochrome dot matrix LCD panels.
+
+         DRM driver for Sitronix ST7565/ST7571 panels connected via SPI bus.
+
+         if M is selected the module will be called st7571-spi.
+
 config DRM_ST7586
        tristate "DRM support for Sitronix ST7586 display panels"
        depends on DRM && SPI

diff --git a/drivers/gpu/drm/sitronix/Makefile b/drivers/gpu/drm/sitronix/Makefile
index 8073bb776ff94de750f350b636fd9db3d54fdd46..c631e3359c3dc21ab8522b8f0cfe6e9bf0dbc011 100644 (file)
--- a/drivers/gpu/drm/sitronix/Makefile
+++ b/drivers/gpu/drm/sitronix/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_DRM_ST7571)               += st7571.o
 obj-$(CONFIG_DRM_ST7571_I2C)           += st7571-i2c.o
+obj-$(CONFIG_DRM_ST7571_SPI)           += st7571-spi.o
 obj-$(CONFIG_DRM_ST7586)               += st7586.o
 obj-$(CONFIG_DRM_ST7735R)              += st7735r.o

diff --git a/drivers/gpu/drm/sitronix/st7571-spi.c b/drivers/gpu/drm/sitronix/st7571-spi.c
new file mode 100644 (file)
index 0000000..0206e91
--- /dev/null
+++ b/drivers/gpu/drm/sitronix/st7571-spi.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Sitronix ST7571 connected via SPI bus.
+ *
+ * Copyright (C) 2025 Marcus Folkesson <marcus.folkesson@gmail.com>
+ */
+
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "st7571.h"
+
+static const struct regmap_config st7571_spi_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .can_multi_write = true,
+};
+
+static int st7571_spi_probe(struct spi_device *spi)
+{
+       struct st7571_device *st7571;
+       struct regmap *regmap;
+
+       regmap = devm_regmap_init_spi(spi, &st7571_spi_regmap_config);
+       if (IS_ERR(regmap)) {
+               return dev_err_probe(&spi->dev, PTR_ERR(regmap),
+                                    "Failed to initialize regmap\n");
+       }
+
+       st7571 = st7571_probe(&spi->dev, regmap);
+       if (IS_ERR(st7571))
+               return dev_err_probe(&spi->dev, PTR_ERR(st7571),
+                                    "Failed to initialize regmap\n");
+
+       spi_set_drvdata(spi, st7571);
+       return 0;
+}
+
+static void st7571_spi_remove(struct spi_device *spi)
+{
+       struct st7571_device *st7571 = spi_get_drvdata(spi);
+
+       st7571_remove(st7571);
+}
+
+static const struct of_device_id st7571_of_match[] = {
+       { .compatible = "sitronix,st7567", .data = &st7567_config },
+       { .compatible = "sitronix,st7571", .data = &st7571_config },
+       {},
+};
+MODULE_DEVICE_TABLE(of, st7571_of_match);
+
+static const struct spi_device_id st7571_spi_id[] = {
+       { "st7567", 0 },
+       { "st7571", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(spi, st7571_spi_id);
+
+static struct spi_driver st7571_spi_driver = {
+       .driver = {
+               .name = "st7571-spi",
+               .of_match_table = st7571_of_match,
+       },
+       .probe = st7571_spi_probe,
+       .remove = st7571_spi_remove,
+       .id_table = st7571_spi_id,
+};
+
+module_spi_driver(st7571_spi_driver);
+
+MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
+MODULE_DESCRIPTION("DRM Driver for Sitronix ST7571 LCD controller (SPI)");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("DRM_ST7571");