-----Original Message----- From: York Sun Sent: Monday, November 13, 2017 10:33 PM To: Rajesh Bhagat rajesh.bhagat@nxp.com; u-boot@lists.denx.de Cc: Prabhakar Kushwaha prabhakar.kushwaha@nxp.com; Priyanka Jain priyanka.jain@nxp.com Subject: Re: [PATCH v5 0/7] Add VID support for QDS and RDB platforms
On 11/12/2017 09:29 PM, Rajesh Bhagat wrote:
Adds LTC3882 voltage regulator chip support in common VID driver. And adds VID support for LS1088A QDS and RDB platforms.
Rajesh Bhagat (7): armv8: lsch3: Add serdes and DDR voltage setup board: common:vid: Add LS1088A VID Supported voltage values board: common: vid: Add board specific vdd adjust API board: common: vid: Move IR chip specific code in flag Kconfig: Add LTC3882 voltage regulator config board: common: vid: Add support for LTC3882 voltage regulator chip ls1088a: Add VID support for QDS and RDB platforms
.../cpu/armv8/fsl-layerscape/fsl_lsch3_serdes.c | 306
+++++++++++++++++++++
arch/arm/cpu/armv8/fsl-layerscape/soc.c | 34 +-- .../include/asm/arch-fsl-layerscape/fsl_serdes.h | 2 +- .../include/asm/arch-fsl-layerscape/immap_lsch3.h | 43 ++- arch/arm/include/asm/arch-fsl-layerscape/soc.h | 1 + board/freescale/common/Kconfig | 16 ++ board/freescale/common/vid.c | 129 ++++++++- board/freescale/ls1088a/ls1088a.c | 120 ++++++++ include/configs/ls1088aqds.h | 29 ++ include/configs/ls1088ardb.h | 29 ++ 10 files changed, 688 insertions(+), 21 deletions(-)
Rajesh,
Reading your patches, it seems you support different voltage for core, but only support 0.9v for serdes (patch #1) and DDR (patch #7). Is that right?
Hello York,
Basically, LS1088A requires special handling when core is setup to 0.9v which is described as below:
1. Configure the DDR controller to operate at 0.9 v by calling API ddr_enable_0v9_volt 2. Change Serdes SVDD Voltage regulator to 0.9v 3. Reset Serdes post voltage change, and continue with normal boot sequence.
For all other voltage levels no special handling is required.
- Rajesh
York