Commit 66dbdc7c authored by Jagan Teki's avatar Jagan Teki Committed by Maxime Ripard

drm/sun4i: dsi: Handle bus clock via regmap_mmio_attach_clk

regmap has special API to enable the controller bus clock while
initializing register space, and current driver is using
devm_regmap_init_mmio_clk which require to specify bus
clk_id argument as "bus"

But, the usage of clocks are varies between different Allwinner
DSI controllers. Clocking in A33 would need bus and mod clocks
where as A64 would need only bus clock.

Since A64 support only single bus clock, it is optional to
specify the clock-names on the controller device tree node.
So using NULL on clk_id would get the attached clock.

To support clk_id as "bus" and "NULL" during clock enablement
between controllers, this patch add generic code to handle
the bus clock using regmap_mmio_attach_clk with associated
regmap APIs.
Signed-off-by: default avatarJagan Teki <jagan@amarulasolutions.com>
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20191222132229.30276-5-jagan@amarulasolutions.com
parent 26a839b3
......@@ -1081,6 +1081,7 @@ static const struct component_ops sun6i_dsi_ops = {
static int sun6i_dsi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const char *bus_clk_name = NULL;
struct sun6i_dsi *dsi;
struct resource *res;
void __iomem *base;
......@@ -1094,6 +1095,10 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
dsi->host.ops = &sun6i_dsi_host_ops;
dsi->host.dev = dev;
if (of_device_is_compatible(dev->of_node,
"allwinner,sun6i-a31-mipi-dsi"))
bus_clk_name = "bus";
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {
......@@ -1107,25 +1112,35 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
return PTR_ERR(dsi->regulator);
}
dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
&sun6i_dsi_regmap_config);
if (IS_ERR(dsi->regs)) {
dev_err(dev, "Couldn't create the DSI encoder regmap\n");
return PTR_ERR(dsi->regs);
}
dsi->reset = devm_reset_control_get_shared(dev, NULL);
if (IS_ERR(dsi->reset)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(dsi->reset);
}
dsi->regs = devm_regmap_init_mmio(dev, base, &sun6i_dsi_regmap_config);
if (IS_ERR(dsi->regs)) {
dev_err(dev, "Couldn't init regmap\n");
return PTR_ERR(dsi->regs);
}
dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
if (IS_ERR(dsi->bus_clk)) {
dev_err(dev, "Couldn't get the DSI bus clock\n");
return PTR_ERR(dsi->bus_clk);
}
ret = regmap_mmio_attach_clk(dsi->regs, dsi->bus_clk);
if (ret)
return ret;
if (of_device_is_compatible(dev->of_node,
"allwinner,sun6i-a31-mipi-dsi")) {
dsi->mod_clk = devm_clk_get(dev, "mod");
if (IS_ERR(dsi->mod_clk)) {
dev_err(dev, "Couldn't get the DSI mod clock\n");
return PTR_ERR(dsi->mod_clk);
ret = PTR_ERR(dsi->mod_clk);
goto err_attach_clk;
}
}
......@@ -1164,6 +1179,9 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
pm_runtime_disable(dev);
err_unprotect_clk:
clk_rate_exclusive_put(dsi->mod_clk);
err_attach_clk:
if (!IS_ERR(dsi->bus_clk))
regmap_mmio_detach_clk(dsi->regs);
return ret;
}
......@@ -1177,6 +1195,9 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
pm_runtime_disable(dev);
clk_rate_exclusive_put(dsi->mod_clk);
if (!IS_ERR(dsi->bus_clk))
regmap_mmio_detach_clk(dsi->regs);
return 0;
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment