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 v14 mfd 1/9] mfd: ocelot: add helper to get regmap from a resource
Date: Thu, 21 Jul 2022 21:06:01 -0700 [thread overview]
Message-ID: <20220722040609.91703-2-colin.foster@in-advantage.com> (raw)
In-Reply-To: <20220722040609.91703-1-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>
---
v14
* Add header guard
* Change regs type from u32* to void*
* Add Reviewed-by tag
---
MAINTAINERS | 5 ++++
include/linux/mfd/ocelot.h | 60 ++++++++++++++++++++++++++++++++++++++
2 files changed, 65 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..7abca80ba7dc
--- /dev/null
+++ b/include/linux/mfd/ocelot.h
@@ -0,0 +1,60 @@
+/* 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/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 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
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next prev parent reply other threads:[~2022-07-22 4:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-22 4:06 [PATCH v14 mfd 0/9] add support for VSC7512 control over SPI Colin Foster
2022-07-22 4:06 ` Colin Foster [this message]
2022-07-25 9:39 ` [PATCH v14 mfd 1/9] mfd: ocelot: add helper to get regmap from a resource Andy Shevchenko
2022-07-25 15:46 ` Colin Foster
2022-08-01 14:45 ` Lee Jones
2022-07-22 4:06 ` [PATCH v14 mfd 2/9] net: mdio: mscc-miim: add ability to be used in a non-mmio configuration Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 3/9] pinctrl: ocelot: allow pinctrl-ocelot to be loaded as a module Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 4/9] pinctrl: ocelot: add ability to be used in a non-mmio configuration Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 5/9] pinctrl: microchip-sgpio: allow sgpio driver to be used as a module Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 6/9] pinctrl: microchip-sgpio: add ability to be used in a non-mmio configuration Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 7/9] resource: add define macro for register address resources Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 8/9] dt-bindings: mfd: ocelot: add bindings for VSC7512 Colin Foster
2022-07-22 4:06 ` [PATCH v14 mfd 9/9] mfd: ocelot: add support for the vsc7512 chip via spi Colin Foster
2022-07-25 20:00 ` Andy Shevchenko
2022-08-02 2:17 ` Colin Foster
2022-08-02 8:47 ` Andy Shevchenko
2022-08-03 1:28 ` Colin Foster
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