[PATCH v9 net-next 1/7] mfd: ocelot: add helper to get regmap from a resource
From: Colin Foster <colin.foster@in-advantage.com>
Date: 2022-06-10 17:57:22
Also in:
linux-arm-kernel, linux-devicetree, linux-gpio, lkml
Subsystem:
multifunction devices (mfd), ocelot external switch control, the rest · Maintainers:
Lee Jones, Colin Foster, Linus Torvalds
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> --- MAINTAINERS | 5 +++++ include/linux/mfd/ocelot.h | 22 ++++++++++++++++++++++ 2 files changed, 27 insertions(+) create mode 100644 include/linux/mfd/ocelot.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 033a01b07f8f..91b4151c5ad1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS@@ -14352,6 +14352,11 @@ 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..40e775f1143f
--- /dev/null
+++ b/include/linux/mfd/ocelot.h@@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 OR MIT */ +/* Copyright 2022 Innovative Advantage Inc. */ + +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +static inline void +ocelot_platform_init_regmap_from_resource(struct platform_device *pdev, + unsigned int index, + struct regmap **map, + struct resource **res, + const struct regmap_config *config); +{ + u32 __iomem *regs = + devm_platform_get_and_ioremap_resource(pdev, index, res); + + if (!IS_ERR(regs)) + *map = devm_regmap_init_mmio(&pdev->dev, regs, config); + else + *map = ERR_PTR(ENODEV); +}
--
2.25.1