diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-05-09 14:41:55 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-05-09 14:41:55 -0700 |
commit | 45182e4e1f8ac04708ca7508c51d9103f07d81ab (patch) | |
tree | ec8e7131c686bfec6cdd8a7ba6757d5b8fef22bb /drivers/i2c/busses/i2c-designware-common.c | |
parent | 06cbd26d312edfe4a83ff541c23f8f866265eb24 (diff) | |
parent | e6ae3ca27477226eae77cc00d5fad89d7ce64aea (diff) |
Merge branch 'i2c/for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:
- API for late atomic transfers (e.g. to shut down via PMIC). We have a
seperate callback now which is called under clearly defined
conditions. In-kernel users are converted, too.
- new driver for the AMD PCIe MP2 I2C controller
- large refactoring for at91 and bcm-iproc (both gain slave support due
to this)
- and a good share of various driver improvements anf fixes
* 'i2c/for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (57 commits)
dt-bindings: i2c: riic: document r7s9210 support
i2c: imx-lpi2c: Use __maybe_unused instead of #if CONFIG_PM_SLEEP
i2c-piix4: Add Hygon Dhyana SMBus support
i2c: core: apply 'is_suspended' check for SMBus, too
i2c: core: ratelimit 'transfer when suspended' errors
i2c: iproc: Change driver to use 'BIT' macro
i2c: riic: Add Runtime PM support
i2c: mux: demux-pinctrl: use struct_size() in devm_kzalloc()
i2c: mux: pca954x: allow management of device idle state via sysfs
i2c: mux: pca9541: remove support for unused platform data
i2c: mux: pca954x: remove support for unused platform data
dt-bindings: i2c: i2c-mtk: add support for MT8516
i2c: axxia: use auto cmd for last message
i2c: gpio: flag atomic capability if possible
i2c: algo: bit: add flag to whitelist atomic transfers
i2c: stu300: use xfer_atomic callback to bail out early
i2c: ocores: enable atomic xfers
i2c: ocores: refactor setup for polling
i2c: tegra-bpmp: convert to use new atomic callbacks
i2c: omap: Add the master_xfer_atomic hook
...
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-common.c')
-rw-r--r-- | drivers/i2c/busses/i2c-designware-common.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c index a4730111d290..2de7452fcd6d 100644 --- a/drivers/i2c/busses/i2c-designware-common.c +++ b/drivers/i2c/busses/i2c-designware-common.c @@ -251,13 +251,27 @@ unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev) int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare) { + int ret; + if (IS_ERR(dev->clk)) return PTR_ERR(dev->clk); - if (prepare) - return clk_prepare_enable(dev->clk); + if (prepare) { + /* Optional interface clock */ + ret = clk_prepare_enable(dev->pclk); + if (ret) + return ret; + + ret = clk_prepare_enable(dev->clk); + if (ret) + clk_disable_unprepare(dev->pclk); + + return ret; + } clk_disable_unprepare(dev->clk); + clk_disable_unprepare(dev->pclk); + return 0; } EXPORT_SYMBOL_GPL(i2c_dw_prepare_clk); |