Commit Graph

16 Commits

Author SHA1 Message Date
Claudiu Beznea eddfb2e1ee clk: at91: remove the checking of parent_name
There is no need to check parent_name variable while assigning it to
init.parent_names. parent_name variable is already checked at
the beginning of at91_clk_register_peripheral() function.

Fixes: 6114067e43 ("clk: at91: add PMC peripheral clocks")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1598338751-20607-2-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2020-10-13 19:59:01 -07:00
Claudiu Beznea b4c115c761 clk: at91: clk-peripheral: add support for changeable parent rate
Some peripheral clocks on SAMA7G5 supports requesting parent to change
its rate (image related clocks: csi, csi2dc, isc). Add support
so that if registered with this option the clock rate to be
requested from parent.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1595403506-8209-14-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2020-07-24 02:19:08 -07:00
Claudiu Beznea 42324d953b clk: at91: replace conditional operator with double logical not
Replace conditional operator with double logical not as code
may be simpler to read.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1595403506-8209-10-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2020-07-24 02:19:08 -07:00
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00
Alexandre Belloni cb4f4949b1 clk: at91: allow configuring peripheral PCR layout
The PCR register actually changed layout for each SoC. By chance, this
didn't have impact on sama5d[2-4] support but since sama5d3, PID is seven
bits wide and sama5d4 and sama5d2 don't have DIV.

For the DT backward compatibility, keep the layout as is.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2019-04-25 12:34:03 -07:00
Alexandre Belloni 62061d357c clk: at91: move DT compatibility code to its own file
Move all the DT backward compatibility code to its own file so it can be
deleted later.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-10-17 10:45:39 -07:00
Alexandre Belloni b2e39dc0bb clk: at91: allow clock registration from C code
Remove static keyword to allow functions to be used from other units. Also
move some struct and function declarations to pmc.h

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[sboyd@kernel.org: Include pmc.h]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-10-17 10:44:25 -07:00
Alexandre Belloni b3b02eac33 clk: at91: Add sama5d2 suspend/resume
On sama5d2, VDD core maybe be cut while in suspend. This means registers
will be lost. Ensure they are saved and restored properly.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-06-29 18:47:35 -07:00
Stephen Boyd f5644f10dc clk: at91: Migrate to clk_hw based registration and OF APIs
Now that we have clk_hw based provider APIs to register clks, we
can get rid of struct clk pointers in this driver, allowing us to
move closer to a clear split of consumer and provider clk APIs.

Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2016-09-14 17:40:31 -07:00
Alexandre Belloni 0002ca168f clk: at91: remove useless includes
Over time, some includes were copy pasted from other clocks drivers but are
not necessary.

Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-02-17 17:53:04 +01:00
Boris Brezillon 1bdf02326b clk: at91: make use of syscon/regmap internally
Use the regmap coming from syscon to access the registers instead of using
pmc_read/pmc_write. This allows to avoid passing the at91_pmc structure to
the child nodes of the PMC.

The final benefit is to have each clock register itself instead of having
to iterate over the children.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-02-17 17:52:58 +01:00
Nicolas Ferre 36844bdf65 clk: at91: modify PMC peripheral clock to deal with newer register layout
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 <nicolas.ferre@atmel.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-10-01 12:39:43 -07:00
Nicolas Ferre 96ef36e9c4 clk: at91: cleanup PMC header file for PCR register fields
Add _MASK and _OFFSET values and cleanup register fields layout.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-10-01 12:39:41 -07:00
Stephen Boyd d0979335c3 clk: at91: Convert to clk_hw based provider APIs
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 <boris.brezillon@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-08-24 16:48:47 -07:00
Boris Brezillon 86e4404af2 clk: at91: fix PERIPHERAL_MAX_SHIFT definition
Fix the PERIPHERAL_MAX_SHIFT definition (3 instead of 4) and adapt the
round_rate and set_rate logic accordingly.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: "Wu, Songjun" <Songjun.Wu@atmel.com>
2015-06-19 14:43:40 +02:00
Boris BREZILLON 6114067e43 clk: at91: add PMC peripheral clocks
This patch adds new at91 peripheral clock implementation using common clk
framework.

Almost all peripherals provided by at91 SoCs need a clock to work properly.
This clock is enabled/disabled using PCER/PCDR resgisters.

Each peripheral is given an id (see atmel's datasheets) which is used to
define and reference peripheral clocks.

Some new SoCs (at91sam9x5 and sama5d3) provide a new register (PCR) where you
can configure the peripheral clock as a division of the master clock.
This will help reducing the peripherals power comsumption.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2013-12-02 15:31:24 +01:00