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authorSubrata Banik <subi.banik@gmail.com>2021-12-08 16:23:39 +0530
committerSubrata Banik <subrata.banik@intel.com>2021-12-10 04:48:27 +0000
commitde6b489ec52763ba1a6fa65a275c5f457f5d8238 (patch)
tree47500998dd728dc91da7997762af219b5fb375e4 /util/sconfig/description.md
parent18dfed5e8e14658d95f49293a59fa6d6dbb38778 (diff)
mb/intel/adlrvp: Add support for external clock buffer
ADL-P silicon can support 7 SRC CLK's and 10 CLKREQ signals. Out of 7 SRCCLK's 3 will be used for CPU, the rest are for PCH. If more than 4 PCH devices are connected on the platform, an external differential buffer chip needs to be placed at the platform level. A mainboard designer can choose to add an external clock chip, and select the SRC CLK using CONFIG_CLKSRC_FOR_EXTERNAL_BUFFER. CONFIG_CLKSRC_FOR_EXTERNAL_BUFFER provides the CLKSRC that feed clock to discrete buffer for further distribution to platform. TEST=Able to detect SD card connected at x4 PCIe Gen 3 Slot. localhost ~ # dmesg | grep mmc [ 4.997840] mmc0: SDHCI controller on PCI [0000:ae:00.0] using ADMA [ 5.460902] mmc0: new ultra high speed DDR50 SDHC card at address aaaa [ 5.473555] mmcblk0: mmc0:aaaa SS08G 7.40 GiB [ 5.494268] mmcblk0: p1 Change-Id: I21f1155374049c90aa45db25d4128b39aa5898bb Signed-off-by: Subrata Banik <subi.banik@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/59976 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
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