summaryrefslogtreecommitdiff
path: root/src/mainboard/esd/atom15
diff options
context:
space:
mode:
authorLin Huang <hl@rock-chips.com>2016-03-09 18:08:20 +0800
committerPatrick Georgi <pgeorgi@google.com>2016-05-09 08:41:21 +0200
commita1f82a349820e9b0b58031eb70a9a9ff744bbc95 (patch)
treeb0a0ca2d1f8f88e1bc546d93a00a9055b29686e4 /src/mainboard/esd/atom15
parentb38895ea38e1b2d35eed16d8dd8bfb48f0af1ff5 (diff)
rockchip: rk3399: support basic clock driver
This patch initialize the PLL clocks and add function to configure cpu freq. Right now, we set the little cpu freq to 600MHz. In coreboot, we currently care about these four PLLs, o. APLL for cpu clk, where A stands for AXI, o. CPLL and GPLL are the generic PLL mainly for peripheral clk, o. PPLL is only PMU clk. For the peripheral clocks, there are thress clocks named as, aclk_perihp, aclk_perilp0, hclk_perilp1, where the 'h' and 'l' letters refer to High and Low speed. As the diagram below, the aclk_perihp always be the parent of more higher speed peripheral devices like pcie, and hclk_perilp1 for spi, i2c, aclk_perilp0 for crypto. These three clocks can choose parent from GPLL or CPLL freely, in this patch, they are all sourced from GPLL. GPLL(594M)/CPLL(384M) APLL(600M for little core) | | `-- aclk_perihp `-- clk_core(600M == APLL) | | | | `-- periph_aclk(148.5M) `-- atclk_core(300M) | `-- periph_hclk(148.5M) `-- aclkm_core(300M) | `-- periph_pclk(37.125M) `-- pclk_dbg_core(100M) | `-- hclk_perilp1 | | | `-- periph_hclk(99M) PPLL(594M) | `-- periph_pclk(49.5M) | | `-- pmu_pclk(99M) `-- aclk_perilp0 | `-- periph_aclk(99M) `-- periph_hclk(99M) `-- periph_pclk(49.5M) BRANCH=none BUG=chrome-os-partner:51537 TEST=emerge-kevin coreboot Change-Id: I1c46ff17e6b466529244afb41d7fd4abbcfd3da4 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 9f0d31177336a3450577950426f9cc9d56e2254c Original-Change-Id: I4ad00df3e406bd0a7576287d6e62b8993a8c2d02 Original-Signed-off-by: Lin Huang <hl@rock-chips.com> Original-Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com> Original-Reviewed-on: https://chromium-review.googlesource.com/332386 Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org> Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://review.coreboot.org/14706 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/mainboard/esd/atom15')
0 files changed, 0 insertions, 0 deletions