[RFC PATCH v1 02/14] clk: rockchip: rk3576: add OF_PLATDATA support for TPL

[Johan Axelsson]

TPL uses CONFIG_OF_PLATDATA (dtoc), which requires a driver-specific
platdata struct and a .plat_auto size in U_BOOT_DRIVER.  Without
this the driver fails to probe in TPL context because dtoc generates
struct dtd_rockchip_rk3576_cru but the driver does not declare it.

Add:
  - #include <dt-structs.h> for the dtd_rockchip_rk3576_cru type
  - struct rk3576_clk_plat wrapping dtd_rockchip_rk3576_cru
  - .plat_auto = sizeof(struct rk3576_clk_plat) in U_BOOT_DRIVER

Guard clk_set_defaults() with !CONFIG_IS_ENABLED(OF_PLATDATA): it
reads the DT at runtime which is unavailable in OF_PLATDATA builds,
and the assigned-clock properties are handled by dtoc at build time.

Pattern mirrors clk_rk3568.c from the RK3568 RFC series.

Signed-off-by: Johan Axelsson <johan.axelsson at proton.me>
---
 drivers/clk/rockchip/clk_rk3576.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/clk/rockchip/clk_rk3576.c b/drivers/clk/rockchip/clk_rk3576.c
index 1026af27ca1..8f99a440a3e 100644
--- a/drivers/clk/rockchip/clk_rk3576.c
+++ b/drivers/clk/rockchip/clk_rk3576.c
@@ -7,6 +7,7 @@
 #include <bitfield.h>
 #include <clk-uclass.h>
 #include <dm.h>
+#include <dt-structs.h>
 #include <errno.h>
 #include <syscon.h>
 #include <asm/arch-rockchip/cru_rk3576.h>
@@ -17,6 +18,12 @@
 #include <dt-bindings/clock/rockchip,rk3576-cru.h>
 #include <linux/delay.h>
 
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+struct rk3576_clk_plat {
+	struct dtd_rockchip_rk3576_cru dtd;
+};
+#endif
+
 #define DIV_TO_RATE(input_rate, div)	((input_rate) / ((div) + 1))
 
 static struct rockchip_pll_rate_table rk3576_24m_pll_rates[] = {
@@ -2447,12 +2454,14 @@ static int rk3576_clk_probe(struct udevice *dev)
 
 	rk3576_clk_init(priv);
 
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
 	/* Process 'assigned-{clocks/clock-parents/clock-rates}' properties */
 	ret = clk_set_defaults(dev, 1);
 	if (ret)
 		debug("%s clk_set_defaults failed %d\n", __func__, ret);
 	else
 		priv->sync_kernel = true;
+#endif
 
 	return 0;
 }
@@ -2506,6 +2515,9 @@ U_BOOT_DRIVER(rockchip_rk3576_cru) = {
 	.id		= UCLASS_CLK,
 	.of_match	= rk3576_clk_ids,
 	.priv_auto	= sizeof(struct rk3576_clk_priv),
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	.plat_auto	= sizeof(struct rk3576_clk_plat),
+#endif
 	.of_to_plat	= rk3576_clk_ofdata_to_platdata,
 	.ops		= &rk3576_clk_ops,
 	.bind		= rk3576_clk_bind,
-- 
2.45.1.windows.1