zephyr: emul: ps8xxx: Add REG_ID register

Add REG_ID Register used to distinguish between the
PS8745 and PS8815 chips

BUG=None
TEST=./twister -T zephyr/test/drivers
BRANCH=None

Signed-off-by: Sam Hurst <shurst@google.com>
Change-Id: Ib7ed8f7d5c3dc4d978342fabfb1046b1e531d82e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3950209
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Commit-Queue: Keith Short <keithshort@chromium.org>
Reviewed-by: Keith Short <keithshort@chromium.org>
Code-Coverage: Keith Short <keithshort@chromium.org>

2 files changed, 39 insertions, 0 deletions

diff --git a/zephyr/emul/tcpc/emul_ps8xxx.c b/zephyr/emul/tcpc/emul_ps8xxx.c
index 467a487802..22972bf084 100644
--- a/zephyr/emul/tcpc/emul_ps8xxx.c
+++ b/zephyr/emul/tcpc/emul_ps8xxx.c
@@ -43,6 +43,12 @@ struct ps8xxx_emul_data {
 	uint8_t gpio_ctrl;
 	/** HW revision used by PS8815 */
 	uint16_t hw_rev;
+	/**
+	 * Register ID to distinguish between the PS8815-A2 and PS8745-A2
+	 * 0: Indicates this is an 8815-A2 chip
+	 * 1: Indicates this is an 8745-A2 chip
+	 */
+	uint8_t reg_id;
 };
 
 /** Constant configuration of the emulator */
@@ -63,6 +69,15 @@ void ps8xxx_emul_set_chip_rev(const struct emul *emul, uint8_t chip_rev)
 }
 
 /** Check description in emul_ps8xxx.h */
+void ps8xxx_emul_set_reg_id(const struct emul *emul, enum ps8xxx_regid reg_id)
+{
+	struct tcpc_emul_data *tcpc_data = emul->data;
+	struct ps8xxx_emul_data *data = tcpc_data->chip_data;
+
+	data->reg_id = reg_id;
+}
+
+/** Check description in emul_ps8xxx.h */
 void ps8xxx_emul_set_hw_rev(const struct emul *emul, uint16_t hw_rev)
 {
 	struct tcpc_emul_data *tcpc_data = emul->data;
@@ -371,6 +386,11 @@ static int ps8xxx_emul_read_byte_workhorse(const struct emul *emul, int reg,
 			*val = data->chip_rev;
 			return 0;
 		}
+		if (data->prod_id == PS8815_PRODUCT_ID &&
+		    reg == PS8815_P0_REG_ID) {
+			*val = data->chip_rev;
+			return 0;
+		}
 		break;
 	case PS8XXX_EMUL_PORT_1:
 		/* DCI CFG is no available on PS8815 */
diff --git a/zephyr/include/emul/tcpc/emul_ps8xxx.h b/zephyr/include/emul/tcpc/emul_ps8xxx.h
index 6e96af571b..eb49221fd2 100644
--- a/zephyr/include/emul/tcpc/emul_ps8xxx.h
+++ b/zephyr/include/emul/tcpc/emul_ps8xxx.h
@@ -46,6 +46,16 @@ enum ps8xxx_emul_port {
 	PS8XXX_EMUL_PORT_INVAL,
 };
 
+/**
+ * Register ID to distinguish between the PS8815-A2 and PS8745-A2
+ * 0: Indicates this is an 8815-A2 chip
+ * 1: Indicates this is an 8745-A2 chip
+ */
+enum ps8xxx_regid {
+	PS8815_REG_ID,
+	PS8745_REG_ID,
+};
+
 /* For now all devices supported by this emulator has the same FW rev reg */
 #define PS8XXX_REG_FW_REV 0x82
 
@@ -80,6 +90,15 @@ const struct emul *ps8xxx_emul_get_tcpci(const struct emul *emul);
 void ps8xxx_emul_set_chip_rev(const struct emul *emul, uint8_t chip_rev);
 
 /**
+ * @brief Set value of REG_ID used to distinguish between the
+ *	  PS8815-A2 and PS8745-A2
+ *
+ * @param emul Pointer to PS8xxx emulator
+ * @param reg_id Value to be set
+ */
+void ps8xxx_emul_set_reg_id(const struct emul *emul, enum ps8xxx_regid reg_id);
+
+/**
  * @brief Set value of HW revision register on PS8815
  *
  * @param emul Pointer to PS8xxx emulator