linux-kernel - [PATCH v4 2/2] regmap-irq: Add driver callback to configure virtual regs

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Message-Id: <93e7e694e6dc26333a371a19b950919c3d80595e.1616488322.git.gurus@codeaurora.org>
Date:   Tue, 23 Mar 2021 11:43:51 -0700
From:   Guru Das Srinagesh <gurus@...eaurora.org>
To:     Mark Brown <broonie@...nel.org>,
        Markus Elfring <Markus.Elfring@....de>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Joe Perches <joe@...ches.com>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>,
        Anirudh Ghayal <aghayal@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Guru Das Srinagesh <gurus@...eaurora.org>
Subject: [PATCH v4 2/2] regmap-irq: Add driver callback to configure virtual regs

Enable drivers to configure and modify "virtual" registers, which are
non-standard registers that further configure irq type on some devices.
Since they are non-standard, enable drivers to configure them according
to their particular idiosyncrasies by specifying an optional callback
function while registering with the framework.

Signed-off-by: Guru Das Srinagesh <gurus@...eaurora.org>
---
 drivers/base/regmap/regmap-irq.c | 5 +++++
 include/linux/regmap.h           | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index d1ade76..e6343ccc 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -333,6 +333,11 @@ static int regmap_irq_set_type(struct irq_data *data, unsigned int type)
 	default:
 		return -EINVAL;
 	}
+
+	if (d->chip->set_type_virt)
+		return d->chip->set_type_virt(d->virt_buf, type, data->hwirq,
+					      reg);
+
 	return 0;
 }
 
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 4c75717..7cf143ce 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1426,6 +1426,8 @@ struct regmap_irq_sub_irq_map {
  *		     before regmap_irq_handler process the interrupts.
  * @handle_post_irq: Driver specific callback to handle interrupt from device
  *		     after handling the interrupts in regmap_irq_handler().
+ * @set_type_virt:   Driver specific callback to extend regmap_irq_set_type()
+ *		     and configure virt regs.
  * @irq_drv_data:    Driver specific IRQ data which is passed as parameter when
  *		     driver specific pre/post interrupt handler is called.
  *
@@ -1473,6 +1475,8 @@ struct regmap_irq_chip {
 
 	int (*handle_pre_irq)(void *irq_drv_data);
 	int (*handle_post_irq)(void *irq_drv_data);
+	int (*set_type_virt)(unsigned int **buf, unsigned int type,
+			     unsigned long hwirq, int reg);
 	void *irq_drv_data;
 };
 
-- 
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