[PATCH v3 4/4] clk: imx: imx8mp: fix a53 cpu clock
From: peng.fan@nxp.com
Date: 2020-02-19 10:00:25
Also in:
linux-clk, lkml
Subsystem:
common clk framework, nxp i.mx clock drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Abel Vesa, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Peng Fan <peng.fan@nxp.com> The A53 CCM clk root only accepts input up to 1GHz, CCM A53 root signoff timing is 1Ghz, however the A53 core which sources from CCM root could run above 1GHz which voilates the CCM. There is a CORE_SEL slice before A53 core, we need configure the CORE_SEL slice source from ARM PLL, not A53 CCM clk root. The A53 CCM clk root should only be used when need to change ARM PLL frequency. Add arm_a53_core clk that could source from arm_a53_div and arm_pll_out. Configure a53 ccm root sources from 800MHz sys pll Configure a53 core sources from arm_pll_out Mark arm_a53_core as critical clk Reviewed-by: Jacky Bai <ping.bai@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com> --- drivers/clk/imx/clk-imx8mp.c | 16 ++++++++++++---- include/dt-bindings/clock/imx8mp-clock.h | 3 ++- 2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
index a16af4fce044..d67ee36b84de 100644
--- a/drivers/clk/imx/clk-imx8mp.c
+++ b/drivers/clk/imx/clk-imx8mp.c@@ -34,6 +34,8 @@ static const char * const imx8mp_a53_sels[] = {"osc_24m", "arm_pll_out", "sys_pl "sys_pll2_1000m", "sys_pll1_800m", "sys_pll1_400m", "audio_pll1_out", "sys_pll3_out", }; +static const char * const imx8mp_a53_core_sels[] = {"arm_a53_div", "arm_pll_out", }; + static const char * const imx8mp_m7_sels[] = {"osc_24m", "sys_pll2_200m", "sys_pll2_250m", "vpu_pll_out", "sys_pll1_800m", "audio_pll1_out", "video_pll1_out", "sys_pll3_out", };
@@ -554,6 +556,9 @@ static int imx8mp_clocks_probe(struct platform_device *pdev) hws[IMX8MP_CLK_HSIO_AXI_DIV] = imx_clk_hw_divider2("hsio_axi_div", "hsio_axi_cg", ccm_base + 0x8380, 0, 3); hws[IMX8MP_CLK_MEDIA_ISP_DIV] = imx_clk_hw_divider2("media_isp_div", "media_isp_cg", ccm_base + 0x8400, 0, 3); + /* CORE SEL */ + hws[IMX8MP_CLK_A53_CORE] = imx_clk_hw_mux2_flags("arm_a53_core", ccm_base + 0x9880, 24, 1, imx8mp_a53_core_sels, ARRAY_SIZE(imx8mp_a53_core_sels), CLK_IS_CRITICAL); + hws[IMX8MP_CLK_MAIN_AXI] = imx8m_clk_hw_composite_critical("main_axi", imx8mp_main_axi_sels, ccm_base + 0x8800); hws[IMX8MP_CLK_ENET_AXI] = imx8m_clk_hw_composite("enet_axi", imx8mp_enet_axi_sels, ccm_base + 0x8880); hws[IMX8MP_CLK_NAND_USDHC_BUS] = imx8m_clk_hw_composite_critical("nand_usdhc_bus", imx8mp_nand_usdhc_sels, ccm_base + 0x8900);
@@ -724,11 +729,14 @@ static int imx8mp_clocks_probe(struct platform_device *pdev) hws[IMX8MP_CLK_VPU_ROOT] = imx_clk_hw_gate4("vpu_root_clk", "vpu_bus", ccm_base + 0x4630, 0); hws[IMX8MP_CLK_AUDIO_ROOT] = imx_clk_hw_gate4("audio_root_clk", "ipg_root", ccm_base + 0x4650, 0); - hws[IMX8MP_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_div", - hws[IMX8MP_CLK_A53_DIV]->clk, - hws[IMX8MP_CLK_A53_SRC]->clk, + clk_hw_set_parent(hws[IMX8MP_CLK_A53_SRC], hws[IMX8MP_SYS_PLL1_800M]); + clk_hw_set_parent(hws[IMX8MP_CLK_A53_CORE], hws[IMX8MP_ARM_PLL_OUT]); + + hws[IMX8MP_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_core", + hws[IMX8MP_CLK_A53_CORE]->clk, + hws[IMX8MP_CLK_A53_CORE]->clk, hws[IMX8MP_ARM_PLL_OUT]->clk, - hws[IMX8MP_SYS_PLL1_800M]->clk); + hws[IMX8MP_CLK_A53_DIV]->clk); imx_check_clk_hws(hws, IMX8MP_CLK_END);
diff --git a/include/dt-bindings/clock/imx8mp-clock.h b/include/dt-bindings/clock/imx8mp-clock.h
index 2fab63186bca..c92d1f4117eb 100644
--- a/include/dt-bindings/clock/imx8mp-clock.h
+++ b/include/dt-bindings/clock/imx8mp-clock.h@@ -294,7 +294,8 @@ #define IMX8MP_CLK_DRAM_ALT_ROOT 285 #define IMX8MP_CLK_DRAM_CORE 286 #define IMX8MP_CLK_ARM 287 +#define IMX8MP_CLK_A53_CORE 288 -#define IMX8MP_CLK_END 288 +#define IMX8MP_CLK_END 289 #endif
--
2.16.4
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