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Commit a92ec174 authored by Weifeng Voon's avatar Weifeng Voon Committed by Wolfram Sang
Browse files

i2c: designware: get fast plus and high speed *CNT configuration 



I2C designware controller can run at fast mode plus and high speed. This
patch adds the capability to get the HCNT, LCNT configuration via
FPCN (fast plus) and HSCN (high speed) ACPI method.

Signed-off-by: default avatarWeifeng Voon <weifeng.voon@intel.com>
Signed-off-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 19c0a539

drivers/i2c/busses/i2c-designware-core.h

+8 −0
Original line number Diff line number Diff line
@@ -62,6 +62,10 @@ 
 * @ss_lcnt: standard speed LCNT value

 * @fs_hcnt: fast speed HCNT value

 * @fs_lcnt: fast speed LCNT value

 * @fp_hcnt: fast plus HCNT value

 * @fp_lcnt: fast plus LCNT value

 * @hs_hcnt: high speed HCNT value

 * @hs_lcnt: high speed LCNT value

 * @acquire_lock: function to acquire a hardware lock on the bus

 * @release_lock: function to release a hardware lock on the bus

 * @pm_runtime_disabled: true if pm runtime is disabled
@@ -105,6 +109,10 @@ struct dw_i2c_dev { 
	u16			ss_lcnt;

	u16			fs_hcnt;

	u16			fs_lcnt;

	u16			fp_hcnt;

	u16			fp_lcnt;

	u16			hs_hcnt;

	u16			hs_lcnt;

	int			(*acquire_lock)(struct dw_i2c_dev *dev);

	void			(*release_lock)(struct dw_i2c_dev *dev);

	bool			pm_runtime_disabled;

drivers/i2c/busses/i2c-designware-platdrv.c

+2 −0
Original line number Diff line number Diff line
@@ -107,6 +107,8 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev) 
	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);

	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,

			   &dev->sda_hold_time);

	dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, NULL);

	dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, NULL);



	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);

	if (id && id->driver_data)