PatchTrack

From: Heiko Stuebner <heiko@...> Date: Wed, 22 Apr 2015 21:48:30 +0200

Using orphan clocks can introduce strange behaviour as they don't have rate information at all and also of course don't track This v2/v3 takes into account suggestions from Stephen Boyd to not try to walk the clock tree at runtime but instead keep track of orphan states on clock tree changes and making it mandatory for everybody from the start as orphaned clocks should not be used at all. This fixes an issue on most rk3288 platforms, where some soc-clocks are supplied by a 32khz clock from an external i2c-chip which often is only probed later in the boot process and maybe even after the drivers using these soc-clocks like the tsadc temperature sensor. In this case the driver using the clock should of course defer probing until the clock is actually usable. As this changes the behaviour for orphan clocks, it would of course benefit from more testing than on my Rockchip boards. To keep the recipent-list reasonable and not spam to much I selected one (the topmost) from the get_maintainer output of each drivers/clk entry. Hopefully some will provide Tested-by-tags :-) Thanks Heiko changes since v2: adapt to comments from Stephen Boyd - rename to clk_core_update_orphan_status - use bools instead of 0/1 for the status - remove redundant check in clk_is_orphan changes since v1: - track orphan status on clock tree changes instead of walking the tree on clk_get operations - make get-deferals mandatory for everybody Cc: Boris Brezillon Cc: Alex Elder Cc: Alexandre Belloni Cc: Stephen Warren Cc: Max Filippov Cc: kernel@pengutronix.de Cc: Zhangfei Gao Cc: Santosh Shilimkar Cc: Chao Xie Cc: Jason Cooper Cc: Stefan Wahren Cc: Andrew Bresticker Cc: Robert Jarzmik Cc: Georgi Djakov Cc: Sylwester Nawrocki Cc: Geert Uytterhoeven Cc: Barry Song Cc: Dinh Nguyen Cc: Viresh Kumar Cc: Gabriel FERNANDEZ Cc: emilio@elopez.com.ar Cc: Peter De Schrijver Cc: Tero Kristo Cc: Ulf Hansson Cc: Pawel Moll Cc: Michal Simek Heiko Stuebner (2): clk: track the orphan status of clocks and their children clk: prevent orphan clocks from being used drivers/clk/clk.c | 46 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 43 insertions(+), 3 deletions(-) -- 2.1.4

Patches in this set

• [0001] clk: track the orphan status of clocks and their children (raw)
• [0002] clk: prevent orphan clocks from being used (raw)

Statistics

• 2 individual patches
• 43 lines added
• 3 lines removed