diff options
author | Jerome Brunet <jbrunet@baylibre.com> | 2019-02-01 13:58:41 +0100 |
---|---|---|
committer | Neil Armstrong <narmstrong@baylibre.com> | 2019-02-02 17:43:32 +0100 |
commit | 889c2b7ec42b8d14d421541f0a3ae1238e34891e (patch) | |
tree | 50b87aee6330c788ac17929493973891586e1eaa /drivers/clk/meson/parm.h | |
parent | cb78ba76296efd145c50d943017d76a36544bb76 (diff) |
clk: meson: rework and clean drivers dependencies
Initially, the meson clock directory only hosted 2 controllers drivers,
for meson8 and gxbb. At the time, both used the same set of clock drivers
so managing the dependencies was not a big concern.
Since this ancient time, entropy did its job, controllers with different
requirement and specific clock drivers have been added. Unfortunately, we
did not do a great job at managing the dependencies between the
controllers and the different clock drivers. Some drivers, such as
clk-phase or vid-pll-div, are compiled even if they are useless on the
target (meson8). As we are adding new controllers, we need to be able to
pick a driver w/o pulling the whole thing.
The patch aims to clean things up by:
* providing a dedicated CONFIG_ for each clock drivers
* allowing clock drivers to be compiled as a modules, if possible
* stating explicitly which drivers are required by each controller.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lkml.kernel.org/r/20190201125841.26785-5-jbrunet@baylibre.com
Diffstat (limited to 'drivers/clk/meson/parm.h')
-rw-r--r-- | drivers/clk/meson/parm.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/clk/meson/parm.h b/drivers/clk/meson/parm.h new file mode 100644 index 000000000000..3c9ef1b505ce --- /dev/null +++ b/drivers/clk/meson/parm.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2015 Endless Mobile, Inc. + * Author: Carlo Caione <carlo@endlessm.com> + */ + +#ifndef __MESON_PARM_H +#define __MESON_PARM_H + +#include <linux/bits.h> +#include <linux/regmap.h> + +#define PMASK(width) GENMASK(width - 1, 0) +#define SETPMASK(width, shift) GENMASK(shift + width - 1, shift) +#define CLRPMASK(width, shift) (~SETPMASK(width, shift)) + +#define PARM_GET(width, shift, reg) \ + (((reg) & SETPMASK(width, shift)) >> (shift)) +#define PARM_SET(width, shift, reg, val) \ + (((reg) & CLRPMASK(width, shift)) | ((val) << (shift))) + +#define MESON_PARM_APPLICABLE(p) (!!((p)->width)) + +struct parm { + u16 reg_off; + u8 shift; + u8 width; +}; + +static inline unsigned int meson_parm_read(struct regmap *map, struct parm *p) +{ + unsigned int val; + + regmap_read(map, p->reg_off, &val); + return PARM_GET(p->width, p->shift, val); +} + +static inline void meson_parm_write(struct regmap *map, struct parm *p, + unsigned int val) +{ + regmap_update_bits(map, p->reg_off, SETPMASK(p->width, p->shift), + val << p->shift); +} + +#endif /* __MESON_PARM_H */ + |