From mboxrd@z Thu Jan 1 00:00:00 1970 From: wsa@the-dreams.de (Wolfram Sang) Date: Tue, 13 Dec 2016 21:34:57 +0100 Subject: [PATCH] i2c: designware: add reset interface In-Reply-To: <1479789700-19532-1-git-send-email-zhangfei.gao@linaro.org> References: <1479789700-19532-1-git-send-email-zhangfei.gao@linaro.org> Message-ID: <20161213203457.GB2889@katana> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Adding designware maintainers to CC... > --- > 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 > #include > #include > +#include > #include > #include > #include > @@ -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 > -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: not available URL: