pinctrl: mvebu: add suspend/resume support to Armada XP pinctrl driver

This commit adds suspend/resume support to the Armada XP pinctrl
driver, by simply saving and restoring the MPP registers.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-xp.c b/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
index fc3376147c189962d30e4cd7aaf6a6246161f10e..d191c3a2488578ce4bff00cf7ea517426a335d37 100644 (file)
--- a/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
@@ -34,6 +34,7 @@
 #include "pinctrl-mvebu.h"
 
 static void __iomem *mpp_base;
+static u32 *mpp_saved_regs;
 
 static int armada_xp_mpp_ctrl_get(unsigned pid, unsigned long *config)
 {
@@ -406,12 +407,42 @@ static struct pinctrl_gpio_range mv78460_mpp_gpio_ranges[] = {
        MPP_GPIO_RANGE(2,  64, 64,  3),
 };
 
+static int armada_xp_pinctrl_suspend(struct platform_device *pdev,
+                                    pm_message_t state)
+{
+       struct mvebu_pinctrl_soc_info *soc =
+               platform_get_drvdata(pdev);
+       int i, nregs;
+
+       nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+       for (i = 0; i < nregs; i++)
+               mpp_saved_regs[i] = readl(mpp_base + i * 4);
+
+       return 0;
+}
+
+static int armada_xp_pinctrl_resume(struct platform_device *pdev)
+{
+       struct mvebu_pinctrl_soc_info *soc =
+               platform_get_drvdata(pdev);
+       int i, nregs;
+
+       nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+       for (i = 0; i < nregs; i++)
+               writel(mpp_saved_regs[i], mpp_base + i * 4);
+
+       return 0;
+}
+
 static int armada_xp_pinctrl_probe(struct platform_device *pdev)
 {
        struct mvebu_pinctrl_soc_info *soc = &armada_xp_pinctrl_info;
        const struct of_device_id *match =
                of_match_device(armada_xp_pinctrl_of_match, &pdev->dev);
        struct resource *res;
+       int nregs;
 
        if (!match)
                return -ENODEV;
@@ -459,6 +490,13 @@ static int armada_xp_pinctrl_probe(struct platform_device *pdev)
                break;
        }
 
+       nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+       mpp_saved_regs = devm_kmalloc(&pdev->dev, nregs * sizeof(u32),
+                                     GFP_KERNEL);
+       if (!mpp_saved_regs)
+               return -ENOMEM;
+
        pdev->dev.platform_data = soc;
 
        return mvebu_pinctrl_probe(pdev);
@@ -476,6 +514,8 @@ static struct platform_driver armada_xp_pinctrl_driver = {
        },
        .probe = armada_xp_pinctrl_probe,
        .remove = armada_xp_pinctrl_remove,
+       .suspend = armada_xp_pinctrl_suspend,
+       .resume = armada_xp_pinctrl_resume,
 };
 
 module_platform_driver(armada_xp_pinctrl_driver);