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Date: Sun, 6 Nov 2022 23:35:51 -0600
From: Samuel Holland <samuel@...lland.org>
To: Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maxime Ripard <mripard@...nel.org>
Cc: Samuel Holland <samuel@...lland.org>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...il.com>,
Jagan Teki <jagan@...rulasolutions.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-sunxi@...ts.linux.dev
Subject: [PATCH v2 3/4] drm/sun4i: dsi: Add a variant structure
Replace the ad-hoc calls to of_device_is_compatible() with a structure
describing the differences between variants. This is in preparation for
adding more variants to the driver.
Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
Changes in v2:
- Add the variant check to the probe error path
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 53 +++++++++++++++++---------
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++++
2 files changed, 42 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 34234a144e87..f22c96cc8408 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -1101,12 +1101,16 @@ static const struct component_ops sun6i_dsi_ops = {
static int sun6i_dsi_probe(struct platform_device *pdev)
{
+ const struct sun6i_dsi_variant *variant;
struct device *dev = &pdev->dev;
- const char *bus_clk_name = NULL;
struct sun6i_dsi *dsi;
void __iomem *base;
int ret;
+ variant = device_get_match_data(dev);
+ if (!variant)
+ return -EINVAL;
+
dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
if (!dsi)
return -ENOMEM;
@@ -1114,10 +1118,7 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
dsi->dev = dev;
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";
+ dsi->variant = variant;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base)) {
@@ -1142,7 +1143,7 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
return PTR_ERR(dsi->regs);
}
- dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
+ dsi->bus_clk = devm_clk_get(dev, variant->has_mod_clk ? "bus" : NULL);
if (IS_ERR(dsi->bus_clk))
return dev_err_probe(dev, PTR_ERR(dsi->bus_clk),
"Couldn't get the DSI bus clock\n");
@@ -1151,21 +1152,21 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
if (ret)
return ret;
- if (of_device_is_compatible(dev->of_node,
- "allwinner,sun6i-a31-mipi-dsi")) {
+ if (variant->has_mod_clk) {
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");
ret = PTR_ERR(dsi->mod_clk);
goto err_attach_clk;
}
- }
- /*
- * In order to operate properly, that clock seems to be always
- * set to 297MHz.
- */
- clk_set_rate_exclusive(dsi->mod_clk, 297000000);
+ /*
+ * In order to operate properly, the module clock on the
+ * A31 variant always seems to be set to 297MHz.
+ */
+ if (variant->set_mod_clk)
+ clk_set_rate_exclusive(dsi->mod_clk, 297000000);
+ }
dsi->dphy = devm_phy_get(dev, "dphy");
if (IS_ERR(dsi->dphy)) {
@@ -1191,7 +1192,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
err_remove_dsi_host:
mipi_dsi_host_unregister(&dsi->host);
err_unprotect_clk:
- clk_rate_exclusive_put(dsi->mod_clk);
+ if (dsi->variant->has_mod_clk && dsi->variant->set_mod_clk)
+ clk_rate_exclusive_put(dsi->mod_clk);
err_attach_clk:
regmap_mmio_detach_clk(dsi->regs);
@@ -1205,16 +1207,31 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
component_del(&pdev->dev, &sun6i_dsi_ops);
mipi_dsi_host_unregister(&dsi->host);
- clk_rate_exclusive_put(dsi->mod_clk);
+ if (dsi->variant->has_mod_clk && dsi->variant->set_mod_clk)
+ clk_rate_exclusive_put(dsi->mod_clk);
regmap_mmio_detach_clk(dsi->regs);
return 0;
}
+static const struct sun6i_dsi_variant sun6i_a31_mipi_dsi_variant = {
+ .has_mod_clk = true,
+ .set_mod_clk = true,
+};
+
+static const struct sun6i_dsi_variant sun50i_a64_mipi_dsi_variant = {
+};
+
static const struct of_device_id sun6i_dsi_of_table[] = {
- { .compatible = "allwinner,sun6i-a31-mipi-dsi" },
- { .compatible = "allwinner,sun50i-a64-mipi-dsi" },
+ {
+ .compatible = "allwinner,sun6i-a31-mipi-dsi",
+ .data = &sun6i_a31_mipi_dsi_variant,
+ },
+ {
+ .compatible = "allwinner,sun50i-a64-mipi-dsi",
+ .data = &sun50i_a64_mipi_dsi_variant,
+ },
{ }
};
MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
index c863900ae3b4..f1ddefe0f554 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -15,6 +15,11 @@
#define SUN6I_DSI_TCON_DIV 4
+struct sun6i_dsi_variant {
+ bool has_mod_clk;
+ bool set_mod_clk;
+};
+
struct sun6i_dsi {
struct drm_connector connector;
struct drm_encoder encoder;
@@ -31,6 +36,8 @@ struct sun6i_dsi {
struct mipi_dsi_device *device;
struct drm_device *drm;
struct drm_panel *panel;
+
+ const struct sun6i_dsi_variant *variant;
};
static inline struct sun6i_dsi *host_to_sun6i_dsi(struct mipi_dsi_host *host)
--
2.37.3
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