[PATCH] i2c: designware: add reset interface
From: Wolfram Sang <hidden>
Date: 2016-12-13 20:34:57
Also in:
linux-i2c
On Tue, Nov 22, 2016 at 12:41:40PM +0800, Zhangfei Gao wrote:
Some platforms like hi3660 need do reset first to allow accessing registers Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Adding designware maintainers to CC...
quoted hunk ↗ jump to hunk
--- drivers/i2c/busses/i2c-designware-core.h | 1 + drivers/i2c/busses/i2c-designware-platdrv.c | 5 +++++ 2 files changed, 6 insertions(+)diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 0d44d2a..94b14fa 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h@@ -80,6 +80,7 @@ struct dw_i2c_dev { void __iomem *base; struct completion cmd_complete; struct clk *clk; + struct reset_control *rst; u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev); struct dw_pci_controller *controller; int cmd_err;diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 0b42a12..fd80e58 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c@@ -38,6 +38,7 @@ #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/io.h> +#include <linux/reset.h> #include <linux/slab.h> #include <linux/acpi.h> #include <linux/platform_data/i2c-designware.h>@@ -176,6 +177,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) dev->irq = irq; platform_set_drvdata(pdev, dev); + dev->rst = devm_reset_control_get(&pdev->dev, NULL); + if (!IS_ERR(dev->rst)) + reset_control_reset(dev->rst); + /* fast mode by default because of legacy reasons */ dev->clk_freq = 400000;-- 2.7.4
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