feat(spi_lcd): add spi cs timing parameters

Some lcd hardware drivers need different CS setup time. Add pretrans
and posttrans parameters to control the CS time.

Closes https://github.com/espressif/esp-idf/issues/13071

components/esp_lcd/include/esp_lcd_io_spi.h

@@ -29,6 +29,8 @@ typedef struct {
     void *user_ctx;    /*!< User private data, passed directly to on_color_trans_done's user_ctx */
     int lcd_cmd_bits;   /*!< Bit-width of LCD command */
     int lcd_param_bits; /*!< Bit-width of LCD parameter */
+    uint8_t cs_ena_pretrans;        /*!< Amount of SPI bit-cycles the cs should be activated before the transmission (0-16) */
+    uint8_t cs_ena_posttrans;       /*!< Amount of SPI bit-cycles the cs should stay active after the transmission (0-16) */
     struct {
         unsigned int dc_high_on_cmd: 1;  /*!< If enabled, DC level = 1 indicates command transfer */
         unsigned int dc_low_on_data: 1;  /*!< If enabled, DC level = 0 indicates color data transfer */

components/esp_lcd/spi/esp_lcd_panel_io_spi.c

@@ -50,6 +50,8 @@ typedef struct {
     size_t num_trans_inflight;  // Number of transactions that are undergoing (the descriptor not recycled yet)
     int lcd_cmd_bits;          // Bit width of LCD command
     int lcd_param_bits;        // Bit width of LCD parameter
+    uint8_t cs_ena_pretrans;        // Amount of SPI bit-cycles the cs should be activated before the transmission (0-16)
+    uint8_t cs_ena_posttrans;       // Amount of SPI bit-cycles the cs should stay active after the transmission (0-16)
     struct {
         unsigned int dc_cmd_level: 1;    // Indicates the level of DC line when transferring command
         unsigned int dc_data_level: 1;   // Indicates the level of DC line when transferring color data
@@ -82,6 +84,8 @@ esp_err_t esp_lcd_new_panel_io_spi(esp_lcd_spi_bus_handle_t bus, const esp_lcd_p
         .queue_size = io_config->trans_queue_depth,
         .pre_cb = lcd_spi_pre_trans_cb, // pre-transaction callback, mainly control DC gpio level
         .post_cb = lcd_spi_post_trans_color_cb, // post-transaction, where we invoke user registered "on_color_trans_done()"
+        .cs_ena_pretrans = io_config->cs_ena_pretrans,
+        .cs_ena_posttrans = io_config->cs_ena_posttrans,
     };
     ret = spi_bus_add_device((spi_host_device_t)bus, &devcfg, &spi_panel_io->spi_dev);
     ESP_GOTO_ON_ERROR(ret, err, TAG, "adding spi device to bus failed");

docs/en/api-reference/peripherals/lcd/spi_lcd.rst

@@ -25,6 +25,8 @@ SPI Interfaced LCD
     - :cpp:member:`esp_lcd_panel_io_spi_config_t::spi_mode` sets the SPI mode. The LCD driver uses this mode to communicate with the LCD. For the meaning of the SPI mode, please refer to the :doc:`SPI Master API doc </api-reference/peripherals/spi_master>`.
     - :cpp:member:`esp_lcd_panel_io_spi_config_t::lcd_cmd_bits` and :cpp:member:`esp_lcd_panel_io_spi_config_t::lcd_param_bits` set the bit width of the command and parameter that recognized by the LCD controller chip. This is chip specific, you should refer to your LCD spec in advance.
     - :cpp:member:`esp_lcd_panel_io_spi_config_t::trans_queue_depth` sets the depth of the SPI transaction queue. A bigger value means more transactions can be queued up, but it also consumes more memory.
+    - :cpp:member:`esp_lcd_panel_io_spi_config_t::cs_ena_pretrans` sets the amount of SPI bit-cycles which the cs should be activated before the transmission (0-16).
+    - :cpp:member:`esp_lcd_panel_io_spi_config_t::cs_ena_posttrans` sets the amount of SPI bit-cycles which the cs should stay active after the transmission (0-16).
 
     .. code-block:: c
 

docs/zh_CN/api-reference/peripherals/lcd/spi_lcd.rst

@@ -25,6 +25,8 @@ SPI 接口的 LCD
     - :cpp:member:`esp_lcd_panel_io_spi_config_t::spi_mode` 设置 SPI 模式。LCD 驱动程序使用此模式与 LCD 通信。有关 SPI 模式的详细信息，请参阅 :doc:`SPI 主机 API 文档 </api-reference/peripherals/spi_master>`。
     - :cpp:member:`esp_lcd_panel_io_spi_config_t::lcd_cmd_bits` 和 :cpp:member:`esp_lcd_panel_io_spi_config_t::lcd_param_bits` 分别设置 LCD 控制器芯片可识别的命令及参数的位宽。不同芯片对位宽要求不同，请提前参阅 LCD 规格书。
     - :cpp:member:`esp_lcd_panel_io_spi_config_t::trans_queue_depth` 设置 SPI 传输队列的深度。该值越大，可以排队的传输越多，但消耗的内存也越多。
+    - :cpp:member:`esp_lcd_panel_io_spi_config_t::cs_ena_pretrans` 设置 SPI 在传输之前应激活 CS 信号线的 SPI 位周期数 （0-16）。
+    - :cpp:member:`esp_lcd_panel_io_spi_config_t::cs_ena_posttrans` 设置 SPI 在传输之后保持激活 CS 信号线的 SPI 位周期数 （0-16）。
 
     .. code-block:: c