Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Hanna Hawa <hhhawa@amazon.com>
To:     <wsa@kernel.org>, <linus.walleij@linaro.org>,
        <andriy.shevchenko@linux.intel.com>, <linux-i2c@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-gpio@vger.kernel.org>
CC:     <dwmw@amazon.co.uk>, <benh@amazon.com>, <ronenk@amazon.com>,
        <talel@amazon.com>, <jonnyc@amazon.com>, <hanochu@amazon.com>,
        <farbere@amazon.com>, <itamark@amazon.com>, <hhhawa@amazon.com>
Subject: [PATCH v3 1/1] i2c: Set pinctrl recovery info to device pinctrl
Date:   Mon, 19 Dec 2022 19:32:28 +0000
Message-ID: <20221219193228.35078-1-hhhawa@amazon.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
Precedence: bulk

Currently the i2c subsystem rely on the controller device tree to
initialize the pinctrl recovery information, part of the drivers does
not set this field (rinfo->pinctrl), for example i2c designware driver.

The pins information is saved part of the device structure before probe
and it's done on pinctrl_bind_pins().

Make the i2c init recovery to get the device pins if it's not
initialized by the driver from the device pins.

Added new API to get the device pinctrl.

Signed-off-by: Hanna Hawa <hhhawa@amazon.com>

Change Log v2->v3:
- Add API to get the device pinctrl
- Make the i2c init recovery to get the device pins

Change Log v1->v2:
- set the rinfo->pinctrl to dev->pins->p instead calling
  devm_pinctrl_get()
---
 drivers/i2c/i2c-core-base.c     |  7 ++++++-
 include/linux/pinctrl/devinfo.h | 11 +++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 7539b0740351..17eecdcf1cb2 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -34,6 +34,7 @@
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/devinfo.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_wakeirq.h>
@@ -282,7 +283,11 @@ static void i2c_gpio_init_pinctrl_recovery(struct i2c_adapter *adap)
 {
 	struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
 	struct device *dev = &adap->dev;
-	struct pinctrl *p = bri->pinctrl;
+	struct pinctrl *p;
+
+	if (!bri->pinctrl)
+		bri->pinctrl = dev_pinctrl(dev->parent);
+	p = bri->pinctrl;
 
 	/*
 	 * we can't change states without pinctrl, so remove the states if
diff --git a/include/linux/pinctrl/devinfo.h b/include/linux/pinctrl/devinfo.h
index a48ff69acddd..5c00ee115528 100644
--- a/include/linux/pinctrl/devinfo.h
+++ b/include/linux/pinctrl/devinfo.h
@@ -17,6 +17,7 @@
 #ifdef CONFIG_PINCTRL
 
 /* The device core acts as a consumer toward pinctrl */
+#include <linux/device.h>
 #include <linux/pinctrl/consumer.h>
 
 /**
@@ -40,6 +41,11 @@ struct dev_pin_info {
 extern int pinctrl_bind_pins(struct device *dev);
 extern int pinctrl_init_done(struct device *dev);
 
+static inline struct pinctrl *dev_pinctrl(struct device *dev)
+{
+	return dev->pins && dev->pins->p ? dev->pins->p : NULL;
+}
+
 #else
 
 struct device;
@@ -56,5 +62,10 @@ static inline int pinctrl_init_done(struct device *dev)
 	return 0;
 }
 
+static inline struct pinctrl *get_device_pinctrl(struct device *dev)
+{
+	return NULL;
+}
+
 #endif /* CONFIG_PINCTRL */
 #endif /* PINCTRL_DEVINFO_H */
-- 
2.38.1