spi: multichip support

move hardcoded numbers, etc. into soc files.
create headers for shared types which needs to be documented.

(MINOR CHANGE)

components/soc/esp32/include/soc/spi_caps.h

@@ -12,8 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef _SOC_SPI_PINS_H_
-#define _SOC_SPI_PINS_H_
+#ifndef _SOC_SPI_CAPS_H_
+#define _SOC_SPI_CAPS_H_
+
+#define SOC_SPI_PERIPH_NUM      3
+#define SOC_SPI_DMA_CHAN_NUM    2
 
 #define SPI_PERIPH_NUM          3
 
@@ -41,4 +44,8 @@
 #define VSPI_IOMUX_PIN_NUM_WP   22
 #define VSPI_IOMUX_PIN_NUM_HD   21
 
-#endif /* _SOC_SPI_PINS_H_ */
+#define SOC_SPI_MAXIMUM_BUFFER_SIZE     64
+
+#define SOC_SPI_SUPPORT_AS_CS   1   //Support to toggle the CS while the clock toggles
+
+#endif /* _SOC_SPI_CAPS_H_ */

components/soc/esp32/spi_periph.c

@@ -14,6 +14,8 @@
 
 #include "soc/spi_periph.h"
 
+#define FUNC_SPI    1   //all pins of SPI1, HSPI and VSPI shares this function number
+
 /*
  Bunch of constants for every SPI peripheral: GPIO signals, irqs, hw addr of registers etc
 */
@@ -40,8 +42,8 @@ const spi_signal_conn_t spi_periph_signal[3] = {
         .irq = ETS_SPI1_INTR_SOURCE,
         .irq_dma = ETS_SPI1_DMA_INTR_SOURCE,
         .module = PERIPH_SPI_MODULE,
-        .hw = &SPI1,
-        .func = SPI_FUNC_NUM
+        .func = FUNC_SPI,
+        .hw = &SPI1
     }, {
         .spiclk_out = HSPICLK_OUT_IDX,
         .spiclk_in = HSPICLK_IN_IDX,
@@ -64,8 +66,8 @@ const spi_signal_conn_t spi_periph_signal[3] = {
         .irq = ETS_SPI2_INTR_SOURCE,
         .irq_dma = ETS_SPI2_DMA_INTR_SOURCE,
         .module = PERIPH_HSPI_MODULE,
-        .hw = &SPI2,
-        .func = HSPI_FUNC_NUM
+        .func = FUNC_SPI,
+        .hw = &SPI2
     }, {
         .spiclk_out = VSPICLK_OUT_IDX,
         .spiclk_in = VSPICLK_IN_IDX,
@@ -88,7 +90,7 @@ const spi_signal_conn_t spi_periph_signal[3] = {
         .irq = ETS_SPI3_INTR_SOURCE,
         .irq_dma = ETS_SPI3_DMA_INTR_SOURCE,
         .module = PERIPH_VSPI_MODULE,
-        .hw = &SPI3,
-        .func = VSPI_FUNC_NUM
+        .func = FUNC_SPI,
+        .hw = &SPI3
     }
 };