This revision alters the clock tree such that the clock required by the APBH DMA (NAND_USDHC_BUS_CLK_ROOT _after_ gate CCGR20) is available as an independent clock. So far the gate CCGR20 was used by the NAND_ROOT_CLK only. A previous patch added the NAND_ROOT_CLK to the APBH DMA which lead the clock gate CCGR20 getting enabled: https://patchwork.ozlabs.org/patch/551967/ The data sheet seems to indicate that the APBH DMA only uses hclk which is connected to NAND_USDHC_BUS_CLK_ROOT, but also through gate CCGR20. Tests seem to confirm this wiring. By adding a new clock IMX7D_NAND_USDHC_BUS_RAWNAND_CLK we can assign a clock which also enables the shared CCGR20 gate without changing the DMA driver. This better reflects the true wiring and encapsulates the SoC specific clock wiring in the clock tree instead leaking it into the driver code. The wording "rawnand" has been taken from Table 5-12, Module APBHDMA in the i.MX 7 Reference Manual. Versions 2 and earlier also included NAND driver changes, which are already merged. -- Stefan Changes since v5: - Remove clock-names from dma-apbh node Changes since v4: - Introduce *_RAWNAND_CLK which represent clocks after CCGR20 - Use *_RAWNAND_CLK for APBH DMA and GPMI NAND - Use assigned-clocks to set a reasonable parent for NAND_ROOT_SRC Changes since v3: - Only specify IMX7D_NAND_USDHC_BUS_ROOT_CLK which seems to be sufficent Changes since v2: - Dropped driver changes, alreay merged Changes since v1: - Make clks_count const - Introduce IS_IMX7D for i.MX 7 SoC's and make it part of GPMI_IS_MX6 Stefan Agner (3): clk: imx7d: create clocks behind rawnand clock gate ARM: dts: imx7: add GPMI NAND and APBH DMA ARM: dts: imx7-colibri: add NAND support arch/arm/boot/dts/imx7-colibri.dtsi | 9 ++++++++- arch/arm/boot/dts/imx7s.dtsi | 31 ++++++++++++++++++++++++++- drivers/clk/imx/clk-imx7d.c | 6 +++-- include/dt-bindings/clock/imx7d-clock.h | 4 ++- 4 files changed, 47 insertions(+), 3 deletions(-) base-commit: e2bb3be2c6c623ff0bad975dc9435531f450f0c5 -- git-series 0.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
