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71472c0c06
Add core support to allow clock implementations to select the best parent clock when rounding a rate, e.g. the one which can provide the closest clock rate to that requested. This is by way of adding a new clock op, determine_rate(), which is like round_rate() but has an extra parameter to allow the clock implementation to optionally select a different parent clock. The core then takes care of reparenting the clock when setting the rate. The parent change takes place with the help of some new private data members. struct clk::new_parent specifies a clock's new parent (NULL indicates no change), and struct clk::new_child specifies a clock's new child (whose new_parent member points back to it). The purpose of these are to allow correct walking of the future tree for notifications prior to actually reparenting any clocks, specifically to skip child clocks who are being reparented to another clock (they will be notified via the new parent), and to include any new child clock. These pointers are set by clk_calc_subtree(), and the new_child pointer gets cleared when a child is actually reparented to avoid duplicate POST_RATE_CHANGE notifications. Each place where round_rate() is called, determine_rate() is checked first and called in preference. This restructures a few of the call sites to simplify the logic into if/else blocks. Signed-off-by: James Hogan <james.hogan@imgtec.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Mike Turquette <mturquette@linaro.org> Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Mike Turquette <mturquette@linaro.org> |
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| .. | ||
| mmp | ||
| mvebu | ||
| mxs | ||
| rockchip | ||
| samsung | ||
| socfpga | ||
| spear | ||
| sunxi | ||
| tegra | ||
| ux500 | ||
| versatile | ||
| x86 | ||
| zynq | ||
| clk-axi-clkgen.c | ||
| clk-bcm2835.c | ||
| clk-composite.c | ||
| clk-devres.c | ||
| clk-divider.c | ||
| clk-fixed-factor.c | ||
| clk-fixed-rate.c | ||
| clk-gate.c | ||
| clk-highbank.c | ||
| clk-ls1x.c | ||
| clk-max77686.c | ||
| clk-mux.c | ||
| clk-nomadik.c | ||
| clk-nspire.c | ||
| clk-ppc-corenet.c | ||
| clk-prima2.c | ||
| clk-s2mps11.c | ||
| clk-si5351.c | ||
| clk-si5351.h | ||
| clk-twl6040.c | ||
| clk-u300.c | ||
| clk-vt8500.c | ||
| clk-wm831x.c | ||
| clk.c | ||
| clkdev.c | ||
| Kconfig | ||
| Makefile | ||