[RFC v7 net-next 07/13] pinctrl: microchip-sgpio: add ability to be used in a non-mmio configuration
From: Colin Foster <colin.foster@in-advantage.com>
Date: 2022-03-07 02:13:37
Also in:
linux-arm-kernel, linux-gpio, linux-phy, lkml
Subsystem:
arm/microchip sparx5 soc support, pin control subsystem, the rest · Maintainers:
Steen Hegelund, Daniel Machon, Linus Walleij, Linus Torvalds
There are a few Ocelot chips that can contain SGPIO logic, but can be controlled externally. Specifically the VSC7511, 7512, 7513, and 7514. In the externally controlled configurations these registers are not memory-mapped. Add support for these non-memory-mapped configurations. Signed-off-by: Colin Foster <colin.foster@in-advantage.com> --- drivers/pinctrl/pinctrl-microchip-sgpio.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
index e8e47a6808e6..a91272936c8f 100644
--- a/drivers/pinctrl/pinctrl-microchip-sgpio.c
+++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c@@ -19,6 +19,7 @@ #include <linux/property.h> #include <linux/regmap.h> #include <linux/reset.h> +#include <soc/mscc/ocelot.h> #include "core.h" #include "pinconf.h"
@@ -819,6 +820,7 @@ static int microchip_sgpio_probe(struct platform_device *pdev) struct fwnode_handle *fwnode; struct reset_control *reset; struct sgpio_priv *priv; + struct resource *res; struct clk *clk; u32 __iomem *regs; u32 val;
@@ -851,11 +853,23 @@ static int microchip_sgpio_probe(struct platform_device *pdev) return -EINVAL; } - regs = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(regs)) - return PTR_ERR(regs); + regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); + if (IS_ERR(regs)) { + /* + * Fall back to using IORESOURCE_REG, which is possible in an + * MFD configuration + */ + res = platform_get_resource(pdev, IORESOURCE_REG, 0); + if (!res) { + dev_err(dev, "Failed to get resource\n"); + return -ENODEV; + } + + priv->regs = ocelot_get_regmap_from_resource(dev, res); + } else { + priv->regs = devm_regmap_init_mmio(dev, regs, ®map_config); + } - priv->regs = devm_regmap_init_mmio(dev, regs, ®map_config); if (IS_ERR(priv->regs)) return PTR_ERR(priv->regs);
--
2.25.1