clk: meson: add regmap to the clock controllers

This change registers a regmap in meson8b, gxbb and axg controllers.
The clock are still accessing their registers directly through iomem.
Once all clocks handled by these controllers have been move to regmap,
the regmap register will be removed and replaced with a syscon request.

This is needed because other drivers, such as the HDMI driver, need to
access the HHI register region

Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index db017c29a84c..0981e970de3d 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -23,11 +23,12 @@
 
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
+#include <linux/init.h>
 #include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <linux/reset-controller.h>
 #include <linux/slab.h>
-#include <linux/init.h>
+#include <linux/regmap.h>
 
 #include "clkc.h"
 #include "meson8b.h"
@@ -804,16 +805,27 @@ static const struct reset_control_ops meson8b_clk_reset_ops = {
 	.deassert = meson8b_clk_reset_deassert,
 };
 
+static const struct regmap_config clkc_regmap_config = {
+	.reg_bits       = 32,
+	.val_bits       = 32,
+	.reg_stride     = 4,
+};
+
 static int meson8b_clkc_probe(struct platform_device *pdev)
 {
 	int ret, i;
 	struct clk_hw *parent_hw;
 	struct clk *parent_clk;
 	struct device *dev = &pdev->dev;
+	struct regmap *map;
 
 	if (!clk_base)
 		return -ENXIO;
 
+	map = devm_regmap_init_mmio(dev, clk_base, &clkc_regmap_config);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
 	/* Populate base address for PLLs */
 	for (i = 0; i < ARRAY_SIZE(meson8b_clk_plls); i++)
 		meson8b_clk_plls[i]->base = clk_base;