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path: root/drivers/clk/mmp/clk-frac.c
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2022-06-10treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE ↵Thomas Gleixner1-4/+1
(part 2) Based on the normalized pattern: this file is licensed under the terms of the gnu general public license version 2 this program is licensed as is without any warranty of any kind whether express or implied extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-28clk: mmp: frac: Allow setting bits other than the numerator/denominatorLubomir Rintel1-0/+3
For the I2S fractional clocks, there are more bits that need to be set for the clock to run. Their actual meaning is unknown. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lkml.kernel.org/r/20200519224151.2074597-3-lkundrak@v3.sk Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2020-05-28clk: mmp: frac: Do not lose last 4 digits of precisionLubomir Rintel1-8/+16
While calculating the output rate of a fractional divider clock, the value is divided and multipled by 10000, discarding the least significant digits -- presumably to fit the intermediate value within 32 bits. The precision we're losing is, however, not insignificant for things like I2S clock. Maybe also elsewhere, now that since commit ea56ad60260e ("clk: mmp2: Stop pretending PLL outputs are constant") the parent rates are more precise and no longer rounded to 10000s. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Link: https://lkml.kernel.org/r/20200519224151.2074597-2-lkundrak@v3.sk Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2019-12-24clk: let init callback return an error codeJerome Brunet1-1/+3
If the init callback is allowed to request resources, it needs a return value to report the outcome of such a request. Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Link: https://lkml.kernel.org/r/20190924123954.31561-3-jbrunet@baylibre.com Reviewed-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2019-06-07clk: mmp: frac: Remove set but not used variable 'prev_rate'YueHaibing1-2/+1
Fixes gcc '-Wunused-but-set-variable' warning: drivers/clk/mmp/clk-frac.c: In function clk_factor_set_rate: drivers/clk/mmp/clk-frac.c:81:16: warning: variable prev_rate set but not used [-Wunused-but-set-variable] It's never used and can be removed. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2017-11-15Merge branch 'clk-cleanup' into clk-nextStephen Boyd1-3/+1
* clk-cleanup: clk: kona-setup: Delete error messages for failed memory allocations ARC: clk: fix spelling mistake: "configurarion" -> "configuration" clk: cdce925: remove redundant check for non-null parent_name clk: versatile: Improve sizeof() usage clk: versatile: Delete error messages for failed memory allocations clk: ux500: Improve sizeof() usage clk: ux500: Delete error messages for failed memory allocations clk: spear: Delete error messages for failed memory allocations clk: ti: Delete error messages for failed memory allocations clk: mmp: Adjust checks for NULL pointers clk: mmp: Use common error handling code in mmp_clk_register_mix() clk: mmp: Delete error messages for failed memory allocations clk: clk-xgene: Adjust six checks for null pointers clk: clk-xgene: Delete error messages for failed memory allocations clk: clk-u300: Fix a typo in two comment lines clk: clk-u300: Add some spaces for better code readability clk: clk-u300: Improve sizeof() usage clk: clk-u300: Delete error messages for failed memory allocations clk: clk-mux: Improve a size determination in clk_hw_register_mux_table() clk: clk-mux: Delete an error message for a failed memory allocation
2017-11-14clk: mmp: Delete error messages for failed memory allocationsMarkus Elfring1-3/+1
Omit extra messages for a memory allocation failure in these functions. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-11-02clk: mmp: make clk_ops constBhumika Goyal1-1/+1
Make these const as they are only stored in the const field of a clk_init_data structure. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2014-12-11clk: mmp: fix sparse non static symbol warningWei Yongjun1-1/+1
Fixes the following sparse warnings: drivers/clk/mmp/clk-frac.c:113:6: warning: symbol 'clk_factor_init' was not declared. Should it be static? Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Michael Turquette <mturquette@linaro.org>
2014-11-13clk: mmp: move definiton of mmp_clk_frac to clk.hChao Xie1-8/+0
Move the definition of structure of mmp_clk_frac to clk.h. So device tree support can use this structure. Signed-off-by: Chao Xie <chao.xie@marvell.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Michael Turquette <mturquette@linaro.org>
2014-11-13clk: mmp: add init callback for clk-fracChao Xie1-0/+40
For the clk-frac, we need to make sure that the initial clock rate is one item of the table. If it is not, we use the first item in the table by default. Signed-off-by: Chao Xie <chao.xie@marvell.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Michael Turquette <mturquette@linaro.org>
2014-11-13clk: mmp: add spin lock for clk-fracChao Xie1-1/+10
The register used by clk-frac may be shared with other clocks. So it needs to use spin lock to protect the register access. Signed-off-by: Chao Xie <chao.xie@marvell.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Michael Turquette <mturquette@linaro.org>
2014-11-13clk: mmp: add prefix "mmp" for structures defined for clk-fracChao Xie1-11/+12
The structures defined for clk-frac will be used out side of clk-frac.c. To avoid conflicts, add prefix "mmp" for these structures' name. Signed-off-by: Chao Xie <chao.xie@marvell.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Michael Turquette <mturquette@linaro.org>
2014-03-27clk: mmp: try to use closer one when do round rateChao Xie1-3/+7
The orignal code will use the bigger rate between "previous rate" and "current rate" when caculate the rate. In fact, hardware cares about the closest one. So choose the closer rate between "previous rate" and "current rate". Signed-off-by: Chao Xie <chao.xie@marvell.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2014-03-27clk: mmp: fix the wrong calculation formulaChao Xie1-5/+5
The formula is numerator/denominator = Fin / (Fout * factor) So Fout = Fin * denominator / (numerator * factor). Current clk_factor_round_rate and clk_factor_recalc_rate use wrong formula. This patch will fix them. Signed-off-by: Chao Xie <chao.xie@marvell.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2014-03-27clk: mmp: fix wrong mask when calculate denominatorChao Xie1-1/+1
The code has typo when calculate denominator. It should use den_mask instead of num_mask. Signed-off-by: Chao Xie <chao.xie@marvell.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2012-08-29clk: mmp: add mmp specific clocksChao Xie1-0/+153
add mmp specific clocks including apbc cloks, apmu clocks, and pll2, fraction clocks Signed-off-by: Chao Xie <xiechao.mail@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
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