fix(linux): Enable PRU HW UART doc for am62x and am64x

PRU HW UART support exists for AM62x and AM64x SK board, enable
documentation for these platforms and update rst to accomadate
the new platforms.

Signed-off-by: Judith Mendez <jm@ti.com>

Author: jmenti

configs/AM62X/AM62X_linux_toc.txt

@@ -108,6 +108,7 @@ linux/Foundational_Components_PRU_Subsystem
 linux/Foundational_Components/PRU-ICSS-Linux-Drivers
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/RemoteProc
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/RPMsg
+linux/Foundational_Components/PRU-ICSS/Linux_Drivers/pruss-uart
 linux/Foundational_Components/PRU-ICSS/RPMsg_Quick_Start_Guide
 linux/Foundational_Components/PRU-ICSS-Hardware
 linux/Foundational_Components/PRU-ICSS/PRU-EVMs

configs/AM64X/AM64X_linux_toc.txt

@@ -109,6 +109,7 @@ linux/Foundational_Components/PRU-ICSS/Linux_Drivers/RemoteProc
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_Ethernet
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_Ethernet_Switch
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/RPMsg
+linux/Foundational_Components/PRU-ICSS/Linux_Drivers/pruss-uart
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_XDP
 linux/Foundational_Components/PRU-ICSS/RPMsg_Quick_Start_Guide
 linux/Foundational_Components/PRU-ICSS-Hardware

source/linux/Foundational_Components/PRU-ICSS/Linux_Drivers/pruss-uart.rst

@@ -3,27 +3,32 @@ PRU-ICSS Serial UART
 
 .. rubric:: Introduction
 
-As of Processor SDK v7.1, Linux supports the PRU UART peripheral within the
-PRU-ICSS, which is based on the industry standard TL16C550.
-The kernel driver is at drivers/tty/serial/8250/8250_pruss.c.
+Linux supports the PRU HW UART peripheral within the
+
+.. ifconfig:: CONFIG_part_variant in ('AM62X')
+
+   Programmable Real-Time Unit Subsystem (PRUSS)
 
+.. ifconfig:: CONFIG_part_variant in ('AM64X')
 
-.. rubric:: Support Devices
+   Programmable Real-Time Unit and Industrial Communication Subsystem - Gigabit (PRU-ICSSG)
 
-- |__PART_FAMILY_DEVICE_NAMES__|
+.. ifconfig:: CONFIG_part_variant in ('AM335X', 'AM437X', 'AM57XX')
 
+   Programmable Real-Time Unit Subsystem and Industrial Communication Subsystem (PRU-ICSS)
+
+which is based on the industry standard TL16C550.
+The kernel driver is at drivers/tty/serial/8250/8250_pruss.c.
 
 .. rubric:: Supported Driver Features
 
 - Baud rates up to 12Mbps
 - Hardware flow control
 
-
 .. rubric:: Unsupported Driver Features
 
 - DMA support
 
-
 .. rubric:: Kernel Config
 
 The PRUSS UART Linux kernel driver depends on the PRU-ICSS kernel drivers. So
@@ -61,7 +66,6 @@ From am335x-evmsk.dts
       status = "okay";
    };
 
-
 .. rubric:: Driver Usage
 
 Once the driver is probed, kernel log shows the following message.
@@ -78,5 +82,3 @@ to :ref:`kernel uart driver usage <linux-kernel-omap-uart-driver-usage>`.
 
     The index in ttyS1 could vary depending on the serial alias configuration
     in the device tree.
-
-