kernel/git/stable/linux.git/drivers/clk/at91, branch linux-4.4.y

clk: at91: usb: continue if clk_hw_round_rate() return zero

2020-04-24T05:57:23+00:00

[ Upstream commit b0ecf1c6c6e82da4847900fad0272abfd014666d ] clk_hw_round_rate() may call round rate function of its parents. In case of SAM9X60 two of USB parrents are PLLA and UPLL. These clocks are controlled by clk-sam9x60-pll.c driver. The round rate function for this driver is sam9x60_pll_round_rate() which call in turn sam9x60_pll_get_best_div_mul(). In case the requested rate is not in the proper range (rate < characteristics->output[0].min && rate > characteristics->output[0].max) the sam9x60_pll_round_rate() will return a negative number to its caller (called by clk_core_round_rate_nolock()). clk_hw_round_rate() will return zero in case a negative number is returned by clk_core_round_rate_nolock(). With this, the USB clock will continue its rate computation even caller of clk_hw_round_rate() returned an error. With this, the USB clock on SAM9X60 may not chose the best parent. I detected this after a suspend/resume cycle on SAM9X60. Signed-off-by: Claudiu Beznea Link: https://lkml.kernel.org/r/1579261009-4573-2-git-send-email-claudiu.beznea@microchip.com Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin

clk: at91: fix check of clk_register() returned value

2016-06-08T01:14:34+00:00

commit cb0ceaf77d93964a0d00477c79f4499123f6159c upstream. The clk_register() function returns a valid pointer to struct clk or ERR_PTR() error code, this makes a check for returned NULL value useless and may lead to oops on error path. Signed-off-by: Vladimir Zapolskiy Acked-by: Alexandre Belloni Acked-by: Boris Brezillon Fixes: bcc5fd49a0fd ("clk: at91: add a driver for the h32mx clock") Signed-off-by: Stephen Boyd Signed-off-by: Greg Kroah-Hartman

clk: at91: add generated clock driver

2015-10-01T19:48:11+00:00

Add a new type of clocks that can be provided to a peripheral. In addition to the peripheral clock, this new clock that can use several input clocks as parents can generate divided rates. This would allow a peripheral to have finer grained clocks for generating a baud rate, clocking an asynchronous part or having more options in frequency. Signed-off-by: Nicolas Ferre Signed-off-by: Boris Brezillon [sboyd@codeaurora.org: Transition to new clk_hw provider APIs] Signed-off-by: Stephen Boyd

clk: at91: add PMC sama5d2 support

2015-10-01T19:39:44+00:00

Add support for the new sama5d2 SoC and adapt capabilities. Signed-off-by: Nicolas Ferre Signed-off-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: modify PMC peripheral clock to deal with newer register layout

2015-10-01T19:39:43+00:00

As some more information is added to the PCR register, we'd better use a copy of its content and modify just the peripheral-related bits. Implement a read-modify-write for the enable() and disable() callbacks. Signed-off-by: Nicolas Ferre Signed-off-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: cleanup PMC header file for PCR register fields

2015-10-01T19:39:41+00:00

Add _MASK and _OFFSET values and cleanup register fields layout. Signed-off-by: Nicolas Ferre Signed-off-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: system: don't try to free_irq when there is no IRQ

2015-09-16T22:22:22+00:00

In the error path of at91_clk_register_system(), sys->irq is freed unconditionally but it may not exist or be request at all. Signed-off-by: Alexandre Belloni Acked-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: utmi: use pmc_read when the at91_pmc is available

2015-09-16T22:22:20+00:00

at91_pmc_read is a workaround to allow external drivers to acces some registers of the PMC. There is no need for it in clk-utmi.c as we aready have a pointer to the struct at91_pmc. Signed-off-by: Alexandre Belloni Acked-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: at91: Convert to clk_hw based provider APIs

2015-08-24T23:48:47+00:00

We're removing struct clk from the clk provider API, so switch this code to using the clk_hw based provider APIs. Acked-by: Boris Brezillon Signed-off-by: Stephen Boyd

clk: Replace __clk_get_num_parents with clk_hw_get_num_parents()

2015-08-24T23:48:43+00:00

Mostly converted with the following semantic patch: @@ struct clk_hw *E; @@ -__clk_get_num_parents(E->clk) +clk_hw_get_num_parents(E) Acked-by: Boris Brezillon Cc: Chao Xie Cc: Krzysztof Kozlowski Cc: Javier Martinez Canillas Cc: Tomasz Figa Cc: Maxime Ripard Cc: "Emilio López" Acked-by: Tero Kristo Cc: Geert Uytterhoeven Acked-by: Sylwester Nawrocki Signed-off-by: Stephen Boyd