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docs: releases: migration-guide-3.7: add note about ST7735R migration

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Add note about migration of ST7735R displays to MIPI DBI API.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2024-03-21 18:34:24 -05:00 • committed by Anas Nashif
commit 1ed9ef465b
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doc/releases/migration-guide-3.7.rst
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@ -213,6 +213,49 @@ Controller Area Network (CAN)
Display
=======
* ST7735R based displays now use the MIPI DBI driver class. These displays
must now be declared within a MIPI DBI driver wrapper device, which will
manage interfacing with the display. Note that the `cmd-data-gpios` pin has
changed polarity with this update, to align better with the new
`dc-gpios` name. For an example, see below:
.. code-block:: devicetree
/* Legacy ST7735R display definition */
&spi0 {
st7735r: st7735r@0 {
compatible = "sitronix,st7735r";
reg = <0>;
spi-max-frequency = <32000000>;
reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
cmd-data-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
...
};
};
/* New display definition with MIPI DBI device */
#include <zephyr/dt-bindings/mipi_dbi/mipi_dbi.h>
...
mipi_dbi {
compatible = "zephyr,mipi-dbi-spi";
reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
dc-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
spi-dev = <&spi0>;
#address-cells = <1>;
#size-cells = <0>;
st7735r: st7735r@0 {
compatible = "sitronix,st7735r";
reg = <0>;
mipi-max-frequency = <32000000>;
mipi-mode = <MIPI_DBI_MODE_SPI_4WIRE>;
...
};
};
Enhanced Serial Peripheral Interface (eSPI)
===========================================