[PATCH v3 06/14] drm/sun4i: hdmi: create a regmap for later use

Chen-Yu Tsai
2017-09-29T08:22:58Z

The HDMI driver is written with readl/writel I/O to the registers.
However, to support the A31 variant, which has a different layout
for the DDC registers, it was recommended to use regfields to have
a cleaner implementation. To use regfields, we need to create an
underlying regmap.

This patch only adds the regmap. It does not convert the existing
driver accesses to use regmap.

Signed-off-by: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Acked-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
drivers/gpu/drm/sun4i/sun4i_hdmi.h | 1 +
drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi.h b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
index 1457750988da..b95512ec8eb6 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
@@ -163,6 +163,7 @@ struct sun4i_hdmi {
struct device *dev;

void __iomem *base;
+ struct regmap *regmap;

/* Parent clocks */
struct clk *bus_clk;
diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
index 3cf1a6932fac..5ab811cda00e 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
@@ -22,6 +22,7 @@
#include <linux/iopoll.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/regmap.h>

#include "sun4i_backend.h"
#include "sun4i_crtc.h"
@@ -267,6 +268,13 @@ static const struct cec_pin_ops sun4i_hdmi_cec_pin_ops = {
};
#endif

+static const struct regmap_config sun4i_hdmi_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0x580,
+};
+
static int sun4i_hdmi_bind(struct device *dev, struct device *master,
void *data)
{
@@ -321,6 +329,13 @@ static int sun4i_hdmi_bind(struct device *dev, struct device *master,
goto err_disable_mod_clk;
}

+ hdmi->regmap = devm_regmap_init_mmio(dev, hdmi->base,
+ &sun4i_hdmi_regmap_config);
+ if (IS_ERR(hdmi->regmap)) {
+ dev_err(dev, "Couldn't create HDMI encoder regmap\n");
+ return PTR_ERR(hdmi->regmap);
+ }
+
ret = sun4i_tmds_create(hdmi);
if (ret) {
dev_err(dev, "Couldn't create the TMDS clock\n");
--
2.14.2