From: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
To: <linux-i2c@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Cc: <wsa@kernel.org>, <robh+dt@kernel.org>,
<ludovic.desroches@microchip.com>, <nicolas.ferre@microchip.com>,
<alexandre.belloni@bootlin.com>, <linux@armlinux.org.uk>,
<kamel.bouhara@bootlin.com>,
Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Subject: [RFC PATCH 4/4] i2c: at91: Move to generic GPIO bus recovery
Date: Fri, 19 Jun 2020 17:19:04 +0300 [thread overview]
Message-ID: <20200619141904.910889-5-codrin.ciubotariu@microchip.com> (raw)
In-Reply-To: <20200619141904.910889-1-codrin.ciubotariu@microchip.com>
Make the Microchip at91 driver the first to use the generic GPIO bus
recovery support from the I2C core and discard the driver implementation.
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
---
drivers/i2c/busses/i2c-at91-master.c | 69 ++--------------------------
drivers/i2c/busses/i2c-at91.h | 3 --
2 files changed, 3 insertions(+), 69 deletions(-)
diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c
index 363d540a8345..66864f9cf7ac 100644
--- a/drivers/i2c/busses/i2c-at91-master.c
+++ b/drivers/i2c/busses/i2c-at91-master.c
@@ -816,79 +816,16 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
return ret;
}
-static void at91_prepare_twi_recovery(struct i2c_adapter *adap)
-{
- struct at91_twi_dev *dev = i2c_get_adapdata(adap);
-
- pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_gpio);
-}
-
-static void at91_unprepare_twi_recovery(struct i2c_adapter *adap)
-{
- struct at91_twi_dev *dev = i2c_get_adapdata(adap);
-
- pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_default);
-}
-
static int at91_init_twi_recovery_gpio(struct platform_device *pdev,
struct at91_twi_dev *dev)
{
struct i2c_bus_recovery_info *rinfo = &dev->rinfo;
- dev->pinctrl = devm_pinctrl_get(&pdev->dev);
- if (!dev->pinctrl || IS_ERR(dev->pinctrl)) {
+ rinfo->pinctrl = devm_pinctrl_get(&pdev->dev);
+ if (!rinfo->pinctrl || IS_ERR(rinfo->pinctrl)) {
dev_info(dev->dev, "can't get pinctrl, bus recovery not supported\n");
- return PTR_ERR(dev->pinctrl);
+ return PTR_ERR(rinfo->pinctrl);
}
-
- dev->pinctrl_pins_default = pinctrl_lookup_state(dev->pinctrl,
- PINCTRL_STATE_DEFAULT);
- dev->pinctrl_pins_gpio = pinctrl_lookup_state(dev->pinctrl,
- "gpio");
- if (IS_ERR(dev->pinctrl_pins_default) ||
- IS_ERR(dev->pinctrl_pins_gpio)) {
- dev_info(&pdev->dev, "pinctrl states incomplete for recovery\n");
- return -EINVAL;
- }
-
- /*
- * pins will be taken as GPIO, so we might as well inform pinctrl about
- * this and move the state to GPIO
- */
- pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_gpio);
-
- rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN);
- if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER)
- return -EPROBE_DEFER;
-
- rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl",
- GPIOD_OUT_HIGH_OPEN_DRAIN);
- if (PTR_ERR(rinfo->scl_gpiod) == -EPROBE_DEFER)
- return -EPROBE_DEFER;
-
- if (IS_ERR(rinfo->sda_gpiod) ||
- IS_ERR(rinfo->scl_gpiod)) {
- dev_info(&pdev->dev, "recovery information incomplete\n");
- if (!IS_ERR(rinfo->sda_gpiod)) {
- gpiod_put(rinfo->sda_gpiod);
- rinfo->sda_gpiod = NULL;
- }
- if (!IS_ERR(rinfo->scl_gpiod)) {
- gpiod_put(rinfo->scl_gpiod);
- rinfo->scl_gpiod = NULL;
- }
- pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_default);
- return -EINVAL;
- }
-
- /* change the state of the pins back to their default state */
- pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_default);
-
- dev_info(&pdev->dev, "using scl, sda for recovery\n");
-
- rinfo->prepare_recovery = at91_prepare_twi_recovery;
- rinfo->unprepare_recovery = at91_unprepare_twi_recovery;
- rinfo->recover_bus = i2c_generic_scl_recovery;
dev->adapter.bus_recovery_info = rinfo;
return 0;
diff --git a/drivers/i2c/busses/i2c-at91.h b/drivers/i2c/busses/i2c-at91.h
index 7e7b4955ca7f..eae673ae786c 100644
--- a/drivers/i2c/busses/i2c-at91.h
+++ b/drivers/i2c/busses/i2c-at91.h
@@ -157,9 +157,6 @@ struct at91_twi_dev {
struct at91_twi_dma dma;
bool slave_detected;
struct i2c_bus_recovery_info rinfo;
- struct pinctrl *pinctrl;
- struct pinctrl_state *pinctrl_pins_default;
- struct pinctrl_state *pinctrl_pins_gpio;
#ifdef CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL
unsigned smr;
struct i2c_client *slave;
--
2.25.1
next prev parent reply other threads:[~2020-06-19 14:22 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 14:19 [RFC PATCH 0/4] i2c: core: add generic GPIO bus recovery Codrin Ciubotariu
2020-06-19 14:19 ` [RFC PATCH 1/4] dt-binding: i2c: add generic properties for " Codrin Ciubotariu
2020-07-05 21:19 ` Wolfram Sang
2020-07-24 19:39 ` Wolfram Sang
2020-07-24 20:52 ` Russell King - ARM Linux admin
2020-07-27 10:44 ` Codrin.Ciubotariu
2020-07-27 10:50 ` Russell King - ARM Linux admin
2020-07-30 9:00 ` Codrin.Ciubotariu
2020-08-03 14:16 ` Russell King - ARM Linux admin
2020-08-03 16:42 ` Codrin.Ciubotariu
2020-07-15 19:21 ` Rob Herring
2020-06-19 14:19 ` [RFC PATCH 2/4] i2c: core: add generic I2C GPIO recovery Codrin Ciubotariu
2020-08-02 16:54 ` Wolfram Sang
2020-08-03 13:27 ` Codrin.Ciubotariu
2020-08-03 16:49 ` wsa
2020-06-19 14:19 ` [RFC PATCH 3/4] i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs Codrin Ciubotariu
2020-08-02 17:05 ` Wolfram Sang
2020-08-03 15:33 ` Codrin.Ciubotariu
2020-08-03 16:59 ` wsa
2020-06-19 14:19 ` Codrin Ciubotariu [this message]
2020-08-02 17:08 ` [RFC PATCH 4/4] i2c: at91: Move to generic GPIO bus recovery Wolfram Sang
2020-08-03 15:42 ` Codrin.Ciubotariu
2020-08-03 16:59 ` wsa
2020-08-26 6:14 ` Wolfram Sang
2020-09-04 8:55 ` Codrin.Ciubotariu
2020-09-04 9:20 ` Wolfram Sang
2020-07-05 21:09 ` [RFC PATCH 0/4] i2c: core: add " Wolfram Sang
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