From: Colin Foster <colin.foster@in-advantage.com>
To: linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org
Cc: Terry Bowman <terry.bowman@amd.com>,
Vladimir Oltean <vladimir.oltean@nxp.com>,
Wolfram Sang <wsa@kernel.org>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
UNGLinuxDriver@microchip.com,
Steen Hegelund <Steen.Hegelund@microchip.com>,
Lars Povlsen <lars.povlsen@microchip.com>,
Linus Walleij <linus.walleij@linaro.org>,
Paolo Abeni <pabeni@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <edumazet@google.com>,
"David S. Miller" <davem@davemloft.net>,
Russell King <linux@armlinux.org.uk>,
Heiner Kallweit <hkallweit1@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Lee Jones <lee.jones@linaro.org>,
katie.morris@in-advantage.com
Subject: [PATCH v15 mfd 1/9] mfd: ocelot: add helper to get regmap from a resource
Date: Tue, 2 Aug 2022 22:47:20 -0700 [thread overview]
Message-ID: <20220803054728.1541104-2-colin.foster@in-advantage.com> (raw)
In-Reply-To: <20220803054728.1541104-1-colin.foster@in-advantage.com>
Several ocelot-related modules are designed for MMIO / regmaps. As such,
they often use a combination of devm_platform_get_and_ioremap_resource()
and devm_regmap_init_mmio().
Operating in an MFD might be different, in that it could be memory mapped,
or it could be SPI, I2C... In these cases a fallback to use IORESOURCE_REG
instead of IORESOURCE_MEM becomes necessary.
When this happens, there's redundant logic that needs to be implemented in
every driver. In order to avoid this redundancy, utilize a single function
that, if the MFD scenario is enabled, will perform this fallback logic.
Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v15
* Add missed errno.h and ioport.h includes
* Add () to function references in both the commit log and comments
v14
* Add header guard
* Change regs type from u32* to void*
* Add Reviewed-by tag
---
MAINTAINERS | 5 +++
include/linux/mfd/ocelot.h | 62 ++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)
create mode 100644 include/linux/mfd/ocelot.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 28108e4fdb8f..f781caceeb38 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14467,6 +14467,11 @@ F: net/dsa/tag_ocelot.c
F: net/dsa/tag_ocelot_8021q.c
F: tools/testing/selftests/drivers/net/ocelot/*
+OCELOT EXTERNAL SWITCH CONTROL
+M: Colin Foster <colin.foster@in-advantage.com>
+S: Supported
+F: include/linux/mfd/ocelot.h
+
OCXL (Open Coherent Accelerator Processor Interface OpenCAPI) DRIVER
M: Frederic Barrat <fbarrat@linux.ibm.com>
M: Andrew Donnellan <ajd@linux.ibm.com>
diff --git a/include/linux/mfd/ocelot.h b/include/linux/mfd/ocelot.h
new file mode 100644
index 000000000000..dd72073d2d4f
--- /dev/null
+++ b/include/linux/mfd/ocelot.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/* Copyright 2022 Innovative Advantage Inc. */
+
+#ifndef _LINUX_MFD_OCELOT_H
+#define _LINUX_MFD_OCELOT_H
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+struct resource;
+
+static inline struct regmap *
+ocelot_regmap_from_resource_optional(struct platform_device *pdev,
+ unsigned int index,
+ const struct regmap_config *config)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ void __iomem *regs;
+
+ /*
+ * Don't use _get_and_ioremap_resource() here, since that will invoke
+ * prints of "invalid resource" which will simply add confusion.
+ */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, index);
+ if (res) {
+ regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(regs))
+ return ERR_CAST(regs);
+ return devm_regmap_init_mmio(dev, regs, config);
+ }
+
+ /*
+ * Fall back to using REG and getting the resource from the parent
+ * device, which is possible in an MFD configuration
+ */
+ if (dev->parent) {
+ res = platform_get_resource(pdev, IORESOURCE_REG, index);
+ if (!res)
+ return NULL;
+
+ return dev_get_regmap(dev->parent, res->name);
+ }
+
+ return NULL;
+}
+
+static inline struct regmap *
+ocelot_regmap_from_resource(struct platform_device *pdev, unsigned int index,
+ const struct regmap_config *config)
+{
+ struct regmap *map;
+
+ map = ocelot_regmap_from_resource_optional(pdev, index, config);
+ return map ?: ERR_PTR(-ENOENT);
+}
+
+#endif
--
2.25.1
next prev parent reply other threads:[~2022-08-03 5:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-03 5:47 [PATCH v15 mfd 0/9] add support for VSC7512 control over SPI Colin Foster
2022-08-03 5:47 ` Colin Foster [this message]
2022-08-03 11:31 ` [PATCH v15 mfd 1/9] mfd: ocelot: add helper to get regmap from a resource Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 2/9] net: mdio: mscc-miim: add ability to be used in a non-mmio configuration Colin Foster
2022-08-03 11:31 ` Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 3/9] pinctrl: ocelot: allow pinctrl-ocelot to be loaded as a module Colin Foster
2022-08-03 11:32 ` Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 4/9] pinctrl: ocelot: add ability to be used in a non-mmio configuration Colin Foster
2022-08-03 11:32 ` Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 5/9] pinctrl: microchip-sgpio: allow sgpio driver to be used as a module Colin Foster
2022-08-03 11:32 ` Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 6/9] pinctrl: microchip-sgpio: add ability to be used in a non-mmio configuration Colin Foster
2022-08-03 11:32 ` Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 7/9] resource: add define macro for register address resources Colin Foster
2022-08-03 11:33 ` Andy Shevchenko
2022-08-03 5:47 ` [PATCH v15 mfd 8/9] dt-bindings: mfd: ocelot: add bindings for VSC7512 Colin Foster
2022-08-03 5:47 ` [PATCH v15 mfd 9/9] mfd: ocelot: add support for the vsc7512 chip via spi Colin Foster
2022-08-03 11:45 ` Andy Shevchenko
2022-08-03 15:56 ` Colin Foster
2022-08-03 17:10 ` Andy Shevchenko
2022-08-03 17:31 ` Colin Foster
2022-08-05 17:44 ` Colin Foster
2022-08-05 17:58 ` Andy Shevchenko
2022-08-05 18:07 ` Colin Foster
2022-08-05 18:14 ` Andy Shevchenko
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