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From: Lucas Stach <l.stach@pengutronix.de>
Date: Thu, 20 Aug 2020 21:45:47 +0200
Subject: [PATCH] clk: imx8mm: fix CPU clock

This is a port of the Linux kernel commit d3b70cd87e77 (clk: imx: imx8mm:
fix a53 cpu cloc). This allows the reparenting as specified in the new DTs
to succeed.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/clk/imx/clk-imx8mm.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c
index a31741af884f..17cb0177f758 100644
--- a/drivers/clk/imx/clk-imx8mm.c
+++ b/drivers/clk/imx/clk-imx8mm.c
@@ -26,6 +26,8 @@ static const char *sys_pll3_bypass_sels[] = {"sys_pll3", "sys_pll3_ref_sel", };
 static const char *imx8mm_a53_sels[] = {"osc_24m", "arm_pll_out", "sys_pll2_500m", "sys_pll2_1000m",
 					"sys_pll1_800m", "sys_pll1_400m", "audio_pll1_out", "sys_pll3_out", };
 
+static const char *imx8mm_a53_core_sels[] = {"arm_a53_div", "arm_pll_out", };
+
 static const char *imx8mm_m4_sels[] = {"osc_24m", "sys_pll2_200m", "sys_pll2_250m", "sys_pll1_266m",
 				       "sys_pll1_800m", "audio_pll1_out", "video_pll1_out", "sys_pll3_out", };
 
@@ -396,6 +398,9 @@ static int imx8mm_clocks_init(struct device_node *ccm_np)
 	clks[IMX8MM_CLK_GPU3D_DIV] = imx_clk_divider2("gpu3d_div", "gpu3d_cg", ccm + 0x8180, 0, 3);
 	clks[IMX8MM_CLK_GPU2D_DIV] = imx_clk_divider2("gpu2d_div", "gpu2d_cg", ccm + 0x8200, 0, 3);
 
+	/* CORE SEL */
+	clks[IMX8MM_CLK_A53_CORE] = imx_clk_mux2_flags("arm_a53_core", ccm + 0x9880, 24, 1, imx8mm_a53_core_sels, ARRAY_SIZE(imx8mm_a53_core_sels), CLK_IS_CRITICAL);
+
 	/* BUS */
 	clks[IMX8MM_CLK_MAIN_AXI] = imx8m_clk_composite_critical("main_axi",  imx8mm_main_axi_sels, ccm + 0x8800);
 	clks[IMX8MM_CLK_ENET_AXI] = imx8m_clk_composite("enet_axi", imx8mm_enet_axi_sels, ccm + 0x8880);
@@ -556,11 +561,11 @@ static int imx8mm_clocks_init(struct device_node *ccm_np)
 	clks[IMX8MM_CLK_DRAM_ALT_ROOT] = imx_clk_fixed_factor("dram_alt_root", "dram_alt", 1, 4);
 	clks[IMX8MM_CLK_DRAM_CORE] = imx_clk_mux2_flags("dram_core_clk", ccm + 0x9800, 24, 1, imx8mm_dram_core_sels, ARRAY_SIZE(imx8mm_dram_core_sels), CLK_IS_CRITICAL);
 
-	clks[IMX8MM_CLK_ARM] = imx_clk_cpu("arm", "arm_a53_div",
-					   clks[IMX8MM_CLK_A53_DIV],
-					   clks[IMX8MM_CLK_A53_SRC],
+	clks[IMX8MM_CLK_ARM] = imx_clk_cpu("arm", "arm_a53_core",
+					   clks[IMX8MM_CLK_A53_CORE],
+					   clks[IMX8MM_CLK_A53_CORE],
 					   clks[IMX8MM_ARM_PLL_OUT],
-					   clks[IMX8MM_SYS_PLL1_800M]);
+					   clks[IMX8MM_CLK_A53_DIV]);
 
 	imx_check_clocks(clks, ARRAY_SIZE(clks));