soc/intel/common: Add CPU Port ID field to GPIO communities

The CPU can have its own Port IDs when addressing GPIO communities, which
differ from the PCH PCR IDs.

1) Add a field to `struct pad_community` that can hold this value when
   known.
2) Add a function to return this value for a given GPIO pad.

Change-Id: I007c01758ae3026fe4dfef07b6a3a269ee3f9e33
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/common/block/gpio/gpio.c

@@ -787,3 +787,9 @@ bool gpio_get_vw_info(gpio_t pad, unsigned int *vw_index, unsigned int *vw_bit)
 
 	return true;
 }
+
+unsigned int gpio_get_pad_cpu_portid(gpio_t pad)
+{
+	const struct pad_community *comm = gpio_get_community(pad);
+	return comm->cpu_port;
+}

src/soc/intel/common/block/include/intelblocks/gpio.h

@@ -124,6 +124,7 @@ struct pad_community {
 	uint8_t		gpi_status_offset;  /* specifies offset in struct
 						gpi_status */
 	uint8_t		port;	/* PCR Port ID */
+	uint8_t		cpu_port; /* CPU Port ID */
 	const struct reset_mapping	*reset_map; /* PADRSTCFG logical to
 			chipset mapping */
 	size_t		num_reset_vals;
@@ -256,5 +257,8 @@ size_t gpio_get_index_in_group(gpio_t pad);
  */
 bool gpio_get_vw_info(gpio_t pad, unsigned int *vw_index, unsigned int *vw_bit);
 
+/* Returns PCR port ID for this pad for the CPU; will be 0 if not available */
+unsigned int gpio_get_pad_cpu_portid(gpio_t pad);
+
 #endif
 #endif /* _SOC_INTELBLOCKS_GPIO_H_ */