pinctrl: mvebu: dove: request additional resources

Dove pinctrl also requires additional registers to control all pins.
This patch requests resources for mpp4 and pmu-mpp register ranges.
As this changes DT to driver requirements, fallback to hardcoded
resources, if the corresponding DT regs have not been set.
Also, WARN about old DT binding usage to encourage users to update
their DTBs.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/mvebu/pinctrl-dove.c b/drivers/pinctrl/mvebu/pinctrl-dove.c
index da9ca26360fd059d2a46501369bef6e0d29c52bb..8d57d4bc1f0c9de4bfda1a1204a55125457550b8 100644 (file)
--- a/drivers/pinctrl/mvebu/pinctrl-dove.c
+++ b/drivers/pinctrl/mvebu/pinctrl-dove.c
@@ -22,6 +22,11 @@
 
 #include "pinctrl-mvebu.h"
 
+/* Internal registers can be configured at any 1 MiB aligned address */
+#define INT_REGS_MASK          ~(SZ_1M - 1)
+#define MPP4_REGS_OFFS         0xd0440
+#define PMU_REGS_OFFS          0xd802c
+
 #define DOVE_SB_REGS_VIRT_BASE         IOMEM(0xfde00000)
 #define DOVE_MPP_VIRT_BASE             (DOVE_SB_REGS_VIRT_BASE + 0xd0200)
 #define DOVE_PMU_MPP_GENERAL_CTRL      (DOVE_MPP_VIRT_BASE + 0x10)
@@ -52,6 +57,8 @@
 #define CONFIG_PMU     BIT(4)
 
 static void __iomem *mpp_base;
+static void __iomem *mpp4_base;
+static void __iomem *pmu_base;
 
 static int dove_mpp_ctrl_get(unsigned pid, unsigned long *config)
 {
@@ -751,7 +758,8 @@ static struct of_device_id dove_pinctrl_of_match[] = {
 
 static int dove_pinctrl_probe(struct platform_device *pdev)
 {
-       struct resource *res;
+       struct resource *res, *mpp_res;
+       struct resource fb_res;
        const struct of_device_id *match =
                of_match_device(dove_pinctrl_of_match, &pdev->dev);
        pdev->dev.platform_data = (void *)match->data;
@@ -767,11 +775,42 @@ static int dove_pinctrl_probe(struct platform_device *pdev)
        }
        clk_prepare_enable(clk);
 
-       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       mpp_base = devm_ioremap_resource(&pdev->dev, res);
+       mpp_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       mpp_base = devm_ioremap_resource(&pdev->dev, mpp_res);
        if (IS_ERR(mpp_base))
                return PTR_ERR(mpp_base);
 
+       /* prepare fallback resource */
+       memcpy(&fb_res, mpp_res, sizeof(struct resource));
+       fb_res.start = 0;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       if (!res) {
+               dev_warn(&pdev->dev, "falling back to hardcoded MPP4 resource\n");
+               adjust_resource(&fb_res,
+                       (mpp_res->start & INT_REGS_MASK) + MPP4_REGS_OFFS, 0x4);
+               res = &fb_res;
+       }
+
+       mpp4_base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(mpp4_base))
+               return PTR_ERR(mpp4_base);
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+       if (!res) {
+               dev_warn(&pdev->dev, "falling back to hardcoded PMU resource\n");
+               adjust_resource(&fb_res,
+                       (mpp_res->start & INT_REGS_MASK) + PMU_REGS_OFFS, 0x8);
+               res = &fb_res;
+       }
+
+       pmu_base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(pmu_base))
+               return PTR_ERR(pmu_base);
+
+       /* Warn on any missing DT resource */
+       WARN(fb_res.start, FW_BUG "Missing pinctrl regs in DTB. Please update your firmware.\n");
+
        return mvebu_pinctrl_probe(pdev);
 }