On Sun, May 8, 2022 at 8:53 PM Colin Foster
[off-list ref] wrote:

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.

...

-       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_init_regmap_from_resource(dev, res);
+       } else {
+               priv->regs = devm_regmap_init_mmio(dev, regs, &regmap_config);
+       }

-       priv->regs = devm_regmap_init_mmio(dev, regs, &regmap_config);
        if (IS_ERR(priv->regs))
                return PTR_ERR(priv->regs);

This looks like repetition of something you have done in a few
previous patches. Can you avoid code duplication by introducing a
corresponding helper function?

-- 
With Best Regards,
Andy Shevchenko