From 884dfb2dfe2cde33b8efe91ebf91542c88ca9034 Mon Sep 17 00:00:00 2001 From: Richard Zhu Date: Thu, 30 Jul 2026 16:55:42 +0800 Subject: clk: imx95-blk-ctl: Add func_out_en clock for i.MX9x PCIe Add a func_out_en clock for i.MX9x PCIe to serve as the parent gate clock of the CREF_EN (BIT6) gate clock. Both of these two gate clocks enable the output of the internal 100MHz differential reference clock. When the internal PLL clock is used as the PCIe reference clock, both BIT6 (CREF_EN) and BIT2 (FUNC_OUTPUT_EN) control the PCIE_REF_OUT_CLK. If these bits default to 1, the output clock is enabled. With typical 100-ohm termination on the board, this results in approximately 6mA of unnecessary power consumption when the PCIe internal PLL clock is not in use. To eliminate this power consumption, add a func_out_en clock gate that serves as the parent of the existing CREF_EN (BIT6) gate clock. Both gates must be enabled to output the internal 100MHz differential reference clock, and both will be disabled when the clock is not needed. Signed-off-by: Richard Zhu Reviewed-by: Peng Fan Link: https://patch.msgid.link/20260730085542.263025-1-hongxing.zhu@oss.nxp.com Signed-off-by: Abel Vesa --- drivers/clk/imx/clk-imx95-blk-ctl.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/clk/imx/clk-imx95-blk-ctl.c b/drivers/clk/imx/clk-imx95-blk-ctl.c index 56bed4471995..1f9259f45607 100644 --- a/drivers/clk/imx/clk-imx95-blk-ctl.c +++ b/drivers/clk/imx/clk-imx95-blk-ctl.c @@ -286,18 +286,28 @@ static const struct imx95_blk_ctl_dev_data netcmix_dev_data = { static const struct imx95_blk_ctl_clk_dev_data hsio_blk_ctl_clk_dev_data[] = { [0] = { .name = "hsio_blk_ctl_clk", - .parent_names = (const char *[]){ "hsio_pll", }, + .parent_names = (const char *[]){ "func_out_en", }, .num_parents = 1, .reg = 0, .bit_idx = 6, .bit_width = 1, .type = CLK_GATE, .flags = CLK_SET_RATE_PARENT, + }, + [1] = { + .name = "func_out_en", + .parent_names = (const char *[]){ "hsio_pll", }, + .num_parents = 1, + .reg = 0, + .bit_idx = 2, + .bit_width = 1, + .type = CLK_GATE, + .flags = CLK_SET_RATE_PARENT, } }; static const struct imx95_blk_ctl_dev_data hsio_blk_ctl_dev_data = { - .num_clks = 1, + .num_clks = ARRAY_SIZE(hsio_blk_ctl_clk_dev_data), .clk_dev_data = hsio_blk_ctl_clk_dev_data, .clk_reg_offset = 0, }; -- cgit v1.2.3