From: zhangfei.gao@linaro.org (Zhangfei Gao)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] i2c: designware: add reset interface
Date: Tue, 22 Nov 2016 12:41:40 +0800 [thread overview]
Message-ID: <1479789700-19532-1-git-send-email-zhangfei.gao@linaro.org> (raw)
Some platforms like hi3660 need do reset first to allow accessing registers
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
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
next reply other threads:[~2016-11-22 4:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-22 4:41 Zhangfei Gao [this message]
2016-12-13 20:34 ` [PATCH] i2c: designware: add reset interface Wolfram Sang
2016-12-14 19:00 ` Andy Shevchenko
2016-12-15 8:56 ` zhangfei
2016-12-15 8:59 ` [PATCH v2] " Zhangfei Gao
2016-12-15 12:33 ` Andy Shevchenko
2016-12-15 14:11 ` Phil Reid
2016-12-15 15:40 ` Jarkko Nikula
2016-12-15 15:30 ` Ramiro Oliveira
2016-12-16 2:45 ` zhangfei
2016-12-16 3:01 ` zhangfei
2016-12-23 10:26 ` Philipp Zabel
2016-12-23 13:39 ` zhangfei
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