Dove pinctrl uses some global config registers to control pins.
This patch requests a syscon regmap for those registers. As this
changes DT to driver requirements, fallback to a self-registered
regmap with hardcoded resources, if the corresponding syscon DT
node is missing. Also, WARN about old DT binding usage to encourage
users to update their DTBs.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselba...@gmail.com>
---
Cc: Jason Cooper <ja...@lakedaemon.net>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: Gregory Clement <gregory.clem...@free-electrons.com>
Cc: Linus Walleij <linus.wall...@linaro.org>
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/pinctrl/mvebu/Kconfig | 1 +
drivers/pinctrl/mvebu/pinctrl-dove.c | 27 +++++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/drivers/pinctrl/mvebu/Kconfig b/drivers/pinctrl/mvebu/Kconfig
index 366fa541ee91..8dc4948c1202 100644
--- a/drivers/pinctrl/mvebu/Kconfig
+++ b/drivers/pinctrl/mvebu/Kconfig
@@ -8,6 +8,7 @@ config PINCTRL_MVEBU
config PINCTRL_DOVE
bool
select PINCTRL_MVEBU
+ select MFD_SYSCON
config PINCTRL_KIRKWOOD
bool
diff --git a/drivers/pinctrl/mvebu/pinctrl-dove.c
b/drivers/pinctrl/mvebu/pinctrl-dove.c
index 3f34975c441f..d2ad130ba21e 100644
--- a/drivers/pinctrl/mvebu/pinctrl-dove.c
+++ b/drivers/pinctrl/mvebu/pinctrl-dove.c
@@ -18,7 +18,9 @@
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/mfd/syscon.h>
#include <linux/pinctrl/pinctrl.h>
+#include <linux/regmap.h>
#include "pinctrl-mvebu.h"
@@ -26,6 +28,7 @@
#define INT_REGS_MASK ~(SZ_1M - 1)
#define MPP4_REGS_OFFS 0xd0440
#define PMU_REGS_OFFS 0xd802c
+#define GC_REGS_OFFS 0xe802c
#define DOVE_SB_REGS_VIRT_BASE IOMEM(0xfde00000)
#define DOVE_MPP_VIRT_BASE (DOVE_SB_REGS_VIRT_BASE + 0xd0200)
@@ -63,6 +66,7 @@
static void __iomem *mpp_base;
static void __iomem *mpp4_base;
static void __iomem *pmu_base;
+static struct regmap *gconfmap;
static int dove_pmu_mpp_ctrl_get(struct mvebu_mpp_ctrl *ctrl,
unsigned long *config)
@@ -781,6 +785,13 @@ static struct of_device_id dove_pinctrl_of_match[] = {
{ }
};
+static struct regmap_config gc_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 5,
+};
+
static int dove_pinctrl_probe(struct platform_device *pdev)
{
const struct of_device_id *match =
@@ -819,6 +830,22 @@ static int dove_pinctrl_probe(struct platform_device *pdev)
if (IS_ERR(pmu_base))
return PTR_ERR(pmu_base);
+ gconfmap =
syscon_regmap_lookup_by_compatible("marvell,dove-global-config");
+ if (IS_ERR(gconfmap)) {
+ void __iomem *gc_base;
+
+ dev_warn(&pdev->dev, "falling back to hardcoded global
registers\n");
+ adjust_resource(&res_fallback,
+ (mpp_res->start & INT_REGS_MASK) + GC_REGS_OFFS, 0x14);
+ gc_base = devm_ioremap_resource(&pdev->dev, &res_fallback);
+ if (IS_ERR(gc_base))
+ return PTR_ERR(gc_base);
+ gconfmap = devm_regmap_init_mmio(&pdev->dev,
+ gc_base, &gc_regmap_config);
+ if (IS_ERR(gconfmap))
+ return PTR_ERR(gconfmap);
+ }
+
/* Warn on any missing DT resource */
WARN(res_fallback.start, "Missing pinctrl regs in DTB. Please update
your firmware.\n");
--
1.8.5.2
--
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