poll: fix poll for regular files and block devices.  Open Group documentation tells that poll (and select) support regular files and that 'Regular files shall always poll TRUE for reading and writing'.

Spirit: Fix typos in conditional compilation. Add debug output.  Remove extra clear of pending interrupts, could cause missing interrupts.  Add spirit_reg_modify() which is not currently used.

Spirit Network Device:  Fix a deadlock.  Also several other design improvements to eliminate corner cases.

Fix for stm32f746g-disco board for button support with interrupt. This change is tested with buttons app example and it is working with interrupts (signals). I tried the test with polling but at this point it doesn't work.

b-l475e-iot91a:  Add apps/examples/nettest and eamples/udp to Spirit1 configuration.  Add telnet support.  fix driver statistics configuration.

lc823450 support

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Spirit: Network driver needs to setup IP address based on configured node address.  If no node address is provided, then it will use a default.  Also upate a README.

Spirit:  Add more debug output.  Make sure device is in READY state after reset and before changing to STANDBY.

NX PR

Approved-by: Gregory Nutt <gnutt@nuttx.org>

stm32f746g-disco:  Make the initialization logic identical to the standard way that is done for all other board.

STM32F7:  Fix for coding standard violations that came in with cd3ca114 -- missed a file last time

STM32F7:  Fix for coding standard violations that came in with cd3ca114

IoT Board/Spirit:  Fix a few issues that interfered with testing.  Move console to the VCOM port (USART) for all configurations.  Rename the spirit-mac configuration to spirit-6lowpan.  Add lots of debug output the spirit network driver.

Bug fixes for STM32F769

Approved-by: Gregory Nutt <gnutt@nuttx.org>

STM32_RCC_DCKCFGR2 has nothing to do with PLLI2S; PLLI2S is not dependent on LTDC, instead on SAICLK1/2 generated from PLLI2S