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The ssd130x driver only provides the core support for these devices but it does not have any bus transport logic. Add a driver to interface over SPI. There is a difference in the communication protocol when using 4-wire SPI instead of I2C. For the latter, a control byte that contains a D/C# field has to be sent. This field tells the controller whether the data has to be written to the command register or to the graphics display data memory. But for 4-wire SPI that control byte is not used, instead a real D/C# line must be pulled HIGH for commands data and LOW for graphics display data. For this reason the standard SPI regmap can't be used and a custom .write bus handler is needed. Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Acked-by: Mark Brown <broonie@kernel.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://patchwork.freedesktop.org/patch/msgid/20220419214824.335075-6-javierm@redhat.com
31 lines
1,004 B
Text
31 lines
1,004 B
Text
config DRM_SSD130X
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tristate "DRM support for Solomon SSD130x OLED displays"
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depends on DRM && MMU
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select BACKLIGHT_CLASS_DEVICE
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select DRM_GEM_SHMEM_HELPER
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select DRM_KMS_HELPER
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help
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DRM driver for the SSD130x Solomon and SINO WEALTH SH110x OLED
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controllers. This is only for the core driver, a driver for the
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appropriate bus transport in your chip also must be selected.
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If M is selected the module will be called ssd130x.
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config DRM_SSD130X_I2C
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tristate "DRM support for Solomon SSD130x OLED displays (I2C bus)"
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depends on DRM_SSD130X && I2C
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select REGMAP_I2C
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help
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Say Y here if the SSD130x or SH110x OLED display is connected via
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I2C bus.
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If M is selected the module will be called ssd130x-i2c.
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config DRM_SSD130X_SPI
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tristate "DRM support for Solomon SSD130X OLED displays (SPI bus)"
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depends on DRM_SSD130X && SPI
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select REGMAP
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help
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Say Y here if the SSD130x OLED display is connected via SPI bus.
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If M is selected the module will be called ssd130x-spi.
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