在 2017-08-15 13:55，Icenowy Zheng 写道：
Allwinner R40 SoC have a clock controller module in the style of the SoCs beyond sun6i, however, it's more rich and complex. Add support for it. Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx> --- Changes in v5: - Added TODO's for PLL constraints. - Forced OHCI12M mux to 0. - Changed "adda" clock to "codec" to be consistent with "bus-codec". - Added several CLK_SET_RATE_{UNGATE,PARENT} flags. - Added PLL_CPU gate notifier. Changes in v4: - Removed usb-ohci-12M mux clocks. - Removed unused (and not in user manual) adda-4x clock. - Implemented proper SATA PLL system. - Renamed MP (Mixed Processor) clock names to drop the extra "DE_". - Renamed TCONs' clock names to "tcon-lcdX" or "tcon-tvX". - Added missing RST_DRAM. - Several clock post/pre-dividers and constraints fixes. Changes in v3: - Rebased on current linux-next. Changes in v2: - Fixes according to the SoC's user manual. drivers/clk/sunxi-ng/Kconfig | 5 + drivers/clk/sunxi-ng/Makefile | 1 +drivers/clk/sunxi-ng/ccu-sun8i-r40.c | 1290 +++++++++++++++++++++++++++++drivers/clk/sunxi-ng/ccu-sun8i-r40.h | 69 ++ include/dt-bindings/clock/sun8i-r40-ccu.h | 187 +++++ include/dt-bindings/reset/sun8i-r40-ccu.h | 130 +++ 6 files changed, 1682 insertions(+) create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-r40.c create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-r40.h create mode 100644 include/dt-bindings/clock/sun8i-r40-ccu.h create mode 100644 include/dt-bindings/reset/sun8i-r40-ccu.h [...] +static void __init sun8i_r40_ccu_setup(struct device_node *node) +{ + void __iomem *reg; + u32 val; + + reg = of_io_request_and_map(node, 0, of_node_full_name(node)); + if (IS_ERR(reg)) { + pr_err("%s: Could not map the clock registers\n", + of_node_full_name(node)); + return; + } + + /* Force the PLL-Audio-1x divider to 4 */ + val = readl(reg + SUN8I_R40_PLL_AUDIO_REG); + val &= ~GENMASK(19, 16); + writel(val | (3 << 16), reg + SUN8I_R40_PLL_AUDIO_REG); + + /* Force PLL-MIPI to MIPI mode */ + val = readl(reg + SUN8I_R40_PLL_MIPI_REG); + val &= ~BIT(16); + writel(val, reg + SUN8I_R40_PLL_MIPI_REG); + + /* Force OHCI 12M parent to 0 */ + val = readl(reg + SUN8I_R40_USB_CLK_REG); + val &= ~GENMASK(20, 6);
Sorry but I think this line should be: val &= ~GENMASK(25, 20); I didn't understand GENMASK well...
+ writel(val, reg + SUN8I_R40_USB_CLK_REG); + + sunxi_ccu_probe(node, reg, &sun8i_r40_ccu_desc); + + /* Gate then ungate PLL CPU after any rate changes */ + ccu_pll_notifier_register(&sun8i_r40_pll_cpu_nb); + + /* Reparent CPU during PLL CPU rate changes */ + ccu_mux_notifier_register(pll_cpu_clk.common.hw.clk, + &sun8i_r40_cpu_nb); +} [...]
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