litmus-rt-ext-res.git/drivers/clk/nxp, branch EXT-RES

clk: lpc32xx: add a quirk for PWM and MS clock dividers

2017-04-12T10:41:15+00:00

[ Upstream commit f84d42a9cffc4ecd96f1ce3a038f841782142eb2 ]

In common clock framework CLK_DIVIDER_ONE_BASED or'ed with
CLK_DIVIDER_ALLOW_ZERO flags indicates that
1) a divider clock may be set to zero value,
2) divider's zero value is interpreted as a non-divided clock.

On the LPC32xx platform clock dividers of PWM and memory card clocks
comply with the first condition, but zero value means a gated clock,
thus it may happen that the divider value is not updated when
the clock is enabled and the clock remains gated.

The change adds one-shot quirks, which check for zero value of divider
on initialization and set it to a non-zero value, therefore in runtime
a gate clock will work as expected.

Signed-off-by: Vladimir Zapolskiy 
Reviewed-by: Sylvain Lemieux 
Signed-off-by: Stephen Boyd 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

clk: nxp: clk-lpc32xx: Unmap region obtained by of_iomap

2016-09-21T20:46:21+00:00

Free memory mapping, if lpc32xx_clk_init is not successful.

Signed-off-by: Arvind Yadav 
Acked-by: Vladimir Zapolskiy 
Acked-by: Sylvain Lemieux 
Signed-off-by: Stephen Boyd

clk: nxp: Use new macro CLK_OF_DECLARE_DRIVER

2016-08-13T01:00:48+00:00

This driver initializes a clock provider via lpc18xx_creg_clk_init
and then continues the initialization on lpc18xx_creg_clk_probe.

Use the new macro to notify the clk subsystem about this behaviour.

Signed-off-by: Ricardo Ribalda Delgado 
[sboyd@codeaurora.org: s/npx/nxp/ in subject]
Signed-off-by: Stephen Boyd

clk: lpc32xx: allow peripheral clock selection in device tree

2016-07-07T00:51:14+00:00

This patch add the support to select the peripheral clock (PERIPH)
as a parent clock source using the "assigned-clock-parents"
parameter in the device tree.

Signed-off-by: Sylvain Lemieux 
Acked-by: Vladimir Zapolskiy 
Signed-off-by: Michael Turquette 
Link: lkml.kernel.org/r/1464982475-24738-1-git-send-email-slemieux.tyco@gmail.com

clk: nxp: lpc18xx: Initialize clk_init_data::flags to 0

2016-05-06T17:55:11+00:00

Failure to initialize this flag to 0 by default can result in
stack junk filling the clk_init_data structure and weird things
happen. Joachim noticed that the critical clk feature started
triggering for these clks causing boot failures, when it really
shouldn't have happened:

BUG: scheduling while atomic: swapper/0/0x00000002
CPU: 0 PID: 0 Comm: swapper Not tainted
4.6.0-rc6-next-20160505-00001-g5c8320450d1c #826
Hardware name: NXP LPC18xx/43xx (Device Tree)
[<2800be81>] (unwind_backtrace) from [<2800b22f>] (show_stack+0xb/0xc)
[<2800b22f>] (show_stack) from [<2801ea21>] (__schedule_bug+0x2d/0x44)
[<2801ea21>] (__schedule_bug) from [<281dc937>] (__schedule+0x3b/0x268)
[<281dc937>] (__schedule) from [<281dcbbb>] (schedule+0x57/0x64)
[<281dcbbb>] (schedule) from [<281de8ef>] (schedule_timeout+0xfb/0x120)
[<281de8ef>] (schedule_timeout) from [<28030fcd>] (msleep+0xf/0x12)
[<28030fcd>] (msleep) from [<28165a6d>] (clk_creg_32k_prepare+0x1f/0x24)
[<28165a6d>] (clk_creg_32k_prepare) from [<281620d5>]
(clk_core_prepare+0x1d/0x36)
[<281620d5>] (clk_core_prepare) from [<2816340b>] (clk_register+0x22f/0x318)
[<2816340b>] (clk_register) from [<282b06c9>] (lpc18xx_creg_clk_init+0x55/0x84)
[<282b06c9>] (lpc18xx_creg_clk_init) from [<282b0149>] (of_clk_init+0xc1/0x12c)
[<282b0149>] (of_clk_init) from [<282a665d>] (time_init+0x15/0x20)
[<282a665d>] (time_init) from [<282a457d>] (start_kernel+0x169/0x274)
[<282a457d>] (start_kernel) from [<28008025>] (0x28008025)
bad: scheduling from the idle thread!
CPU: 0 PID: 0 Comm: swapper Tainted: G W
4.6.0-rc6-next-20160505-00001-g5c8320450d1c #826

Fix this by initializing the flags member to 0.

Acked-by: Joachim Eastwood 
Signed-off-by: Stephen Boyd

clk: add lpc18xx creg clk driver

2016-03-04T20:52:10+00:00

The CREG block on lpc18xx contains configuration register
for two low power clocks. Support enabling of these two
clocks with a clk driver that access CREG trough the
syscon regmap interface.

These clocks are needed to support peripherals like the
internal RTC on lpc18xx.

Signed-off-by: Joachim Eastwood 
Signed-off-by: Stephen Boyd

clk: lpc32xx: fix compilation warning

2016-03-03T19:41:43+00:00

Remove the following false positives compilation warning:
- drivers/clk/nxp/clk-lpc32xx.c: In function 'lpc32xx_clk_register':
  warning: 'hw' may be used uninitialized in this function [-Wmaybe-uninitialized]
- drivers/clk/nxp/clk-lpc32xx.c: In function 'clk_hclk_pll_round_rate':
  warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
  warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
  warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]

Tested using gcc version 4.7.3.

Signed-off-by: Sylvain Lemieux 
[sboyd@codeaurora.org: Drop assignment of hw to NULL as return
silences it and is less likely to lead to hiding problems later]
Signed-off-by: Stephen Boyd

clk: nxp: Remove CLK_IS_ROOT

2016-03-03T01:45:22+00:00

This flag is a no-op now. Remove usage of the flag.

Acked-by: Joachim Eastwood 
Signed-off-by: Stephen Boyd

clk: lpc32xx: add HCLK PLL output configuration

2016-02-10T20:45:16+00:00

This patch add the support to setup the HCLK PLL output
using the "assigned-clock-rates" parameter in the device tree.

If the option is not use, the clock setup by the kickstart
and/or bootloader remain unchanged.

The previous kernel version did not change the clock frequency
output setup by the kickstart and/or bootloader;
this version always setup the clock frequency output to 208MHz.

Signed-off-by: Sylvain Lemieux 
Signed-off-by: Stephen Boyd

clk: lpc32xx: do not register clock "0"

2016-02-10T00:19:34+00:00

The following errors are display in the console during the power-on:
[    0.000000] lpc32xx_usb_clk_init: failed to register (null) clock: -12
[    0.000000] lpc32xx_clk_init: failed to register (null) clock: -12

There is no need to register clock "0"; the first clock used is 1;

Signed-off-by: Sylvain Lemieux 
Acked-by: Vladimir Zapolskiy 
[sboyd@codeaurora.org: s/prepare/register/]
Signed-off-by: Stephen Boyd