linux-kernel - [PATCH v4 02/11] firmware: raspberrypi: Introduce devm_rpi_firmware

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Date:   Thu, 12 Nov 2020 17:36:20 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     u.kleine-koenig@...gutronix.de, linux-kernel@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Cc:     linux-pwm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, wahrenst@....net,
        linux-input@...r.kernel.org, dmitry.torokhov@...il.com,
        gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        p.zabel@...gutronix.de, linux-gpio@...r.kernel.org,
        linus.walleij@...aro.org, linux-clk@...r.kernel.org,
        sboyd@...nel.org, linux-rpi-kernel@...ts.infradead.org,
        bgolaszewski@...libre.com, andy.shevchenko@...il.com
Subject: [PATCH v4 02/11] firmware: raspberrypi: Introduce devm_rpi_firmware_get()

Itroduce devm_rpi_firmware_get(), it'll simplify the firmware handling
for most consumers.

Suggested-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---

Changes since v2:
- Introduce devm_rpi_firmware_get()

 drivers/firmware/raspberrypi.c             | 31 +++++++++++++++++++++-
 include/soc/bcm2835/raspberrypi-firmware.h |  8 ++++++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
index 438e17074a97..4ab2dfdc82ad 100644
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -237,10 +237,17 @@ static void rpi_firmware_delete(struct kref *kref)
 	kfree(fw);
 }
 
-void rpi_firmware_put(struct rpi_firmware *fw)
+static void __rpi_firmware_put(void *data)
 {
+	struct rpi_firmware *fw = data;
+
 	kref_put(&fw->consumers, rpi_firmware_delete);
 }
+
+void rpi_firmware_put(struct rpi_firmware *fw)
+{
+	__rpi_firmware_put(fw);
+}
 EXPORT_SYMBOL_GPL(rpi_firmware_put);
 
 static int rpi_firmware_probe(struct platform_device *pdev)
@@ -326,6 +333,28 @@ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
 }
 EXPORT_SYMBOL_GPL(rpi_firmware_get);
 
+/**
+ * devm_rpi_firmware_get - Get pointer to rpi_firmware structure.
+ * @firmware_node:    Pointer to the firmware Device Tree node.
+ *
+ * Returns NULL is the firmware device is not ready.
+ */
+struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
+					   struct device_node *firmware_node)
+{
+	struct rpi_firmware *fw;
+
+	fw = rpi_firmware_get(firmware_node);
+	if (!fw)
+		return NULL;
+
+	if (devm_add_action_or_reset(dev, __rpi_firmware_put, fw))
+		return NULL;
+
+	return fw;
+}
+EXPORT_SYMBOL_GPL(devm_rpi_firmware_get);
+
 static const struct of_device_id rpi_firmware_of_match[] = {
 	{ .compatible = "raspberrypi,bcm2835-firmware", },
 	{},
diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h
index fdfef7fe40df..73ad784fca96 100644
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -142,6 +142,8 @@ int rpi_firmware_property_list(struct rpi_firmware *fw,
 			       void *data, size_t tag_size);
 void rpi_firmware_put(struct rpi_firmware *fw);
 struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node);
+struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
+					   struct device_node *firmware_node);
 #else
 static inline int rpi_firmware_property(struct rpi_firmware *fw, u32 tag,
 					void *data, size_t len)
@@ -160,6 +162,12 @@ static inline struct rpi_firmware *rpi_firmware_get(struct device_node *firmware
 {
 	return NULL;
 }
+
+static inline struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
+					struct device_node *firmware_node)
+{
+	return NULL;
+}
 #endif
 
 #endif /* __SOC_RASPBERRY_FIRMWARE_H__ */
-- 
2.29.2