We can handle the sysc interconnect target module in a generic way for
many TI SoCs. Initially let's just enable domain clocks before the
children are probed.
The code is loosely based on the drivers/bus/ti-sysc.c of the Linux
kernel version 5.9-rc7.
For DT binding details see:
- Documentation/devicetree/bindings/bus/ti-sysc.txt
Signed-off-by: Dario Binacchi
---
Changes in v8:
- Imply CONFIG_TI_SYSC only if CONFIG_DM and CONFIG_OF_CONTROL are enabled.
- Revert change on cm_t335_defconfig added on version 7 of the series.
Changes in v7:
- Not all OMAP2 platform need CONFIG_TI_SYSC.
Set CONFIG_TI_SYSC as imply and disable it to fix building errors in:
nokia_rx51_defconfig
cm_t335_defconfig
Changes in v4:
- Include device_compat.h header for dev_xxx macros.
arch/arm/Kconfig | 1 +
configs/nokia_rx51_defconfig | 1 +
drivers/bus/Kconfig | 7 ++
drivers/bus/Makefile | 1 +
drivers/bus/ti-sysc.c| 166 +++
5 files changed, 176 insertions(+)
create mode 100644 drivers/bus/ti-sysc.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fbe90875ae..6b5235e740 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -799,6 +799,7 @@ config ARCH_OMAP2PLUS
select SPL_BOARD_INIT if SPL
select SPL_STACK_R if SPL
select SUPPORT_SPL
+ imply TI_SYSC if DM && OF_CONTROL
imply FIT
config ARCH_MESON
diff --git a/configs/nokia_rx51_defconfig b/configs/nokia_rx51_defconfig
index d0c8929525..30a02e2bc3 100644
--- a/configs/nokia_rx51_defconfig
+++ b/configs/nokia_rx51_defconfig
@@ -4,6 +4,7 @@ CONFIG_ARCH_OMAP2PLUS=y
CONFIG_SYS_TEXT_BASE=0x80008000
CONFIG_NR_DRAM_BANKS=2
CONFIG_TARGET_NOKIA_RX51=y
+# CONFIG_TI_SYSC is not set
# CONFIG_FIT is not set
CONFIG_BOOTDELAY=30
CONFIG_AUTOBOOT_KEYED=y
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 07a33c6287..733bec5a56 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -5,6 +5,13 @@
menu "Bus devices"
+config TI_SYSC
+ bool "TI sysc interconnect target module driver"
+ depends on ARCH_OMAP2PLUS
+ help
+ Generic driver for Texas Instruments interconnect target module
+ found on many TI SoCs.
+
config UNIPHIER_SYSTEM_BUS
bool "UniPhier System Bus driver"
depends on ARCH_UNIPHIER
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 0b97fc1f8b..875bb4ed42 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -3,4 +3,5 @@
# Makefile for the bus drivers.
#
+obj-$(CONFIG_TI_SYSC) += ti-sysc.o
obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
new file mode 100644
index 00..65974a70a6
--- /dev/null
+++ b/drivers/bus/ti-sysc.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments sysc interconnect target driver
+ *
+ * Copyright (C) 2020 Dario Binacchi
+ */
+
+#include
+#include
+#include
+#include
+
+enum ti_sysc_clocks {
+ TI_SYSC_FCK,
+ TI_SYSC_ICK,
+ TI_SYSC_MAX_CLOCKS,
+};
+
+static const char *const clock_names[] = {"fck", "ick"};
+
+struct ti_sysc_priv {
+ int clocks_count;
+ struct clk clocks[TI_SYSC_MAX_CLOCKS];
+};
+
+static const struct udevice_id ti_sysc_ids[] = {
+ {.compatible = "ti,sysc-omap2"},
+ {.compatible = "ti,sysc-omap4"},
+ {.compatible = "ti,sysc-omap4-simple"},
+ {.compatible = "ti,sysc-omap3430-sr"},
+ {.compatible = "ti,sysc-omap3630-sr"},
+ {.compatible = "ti,sysc-omap4-sr"},
+ {.compatible = "ti,sysc-omap3-sham"},
+ {.compatible = "ti,sysc-omap-aes"},
+ {.compatible = "ti,sysc-mcasp"},
+ {.compatible = "ti,sysc-usb-host-fs"},
+ {}
+};
+
+static int ti_sysc_get_one_clock(struct udevice *dev, enum ti_sysc_clocks
index)
+{
+ struct ti_sysc_priv *priv = dev_get_priv(dev);
+ const char *name;
+ int err;
+
+ switch (index) {
+ case TI_SYSC_FCK:
+ break;
+ case TI_SYSC_ICK:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ name = clock_names[index];
+
+ err = clk_get_by_name(dev, name, >clocks[index]);
+ if (err) {
+ if (err == -ENODATA)
+ return 0;
+
+ dev_err(dev, "failed to get %s clock\n", name);
+ return err;
+ }
+
+ return 0;
+}
+
+static int ti_sysc_put_clocks(struct udevice *dev)
+{
+ struct ti_sysc_priv *priv = dev_get_priv(dev);
+ int err;
+
+ err = clk_release_all(priv->clocks, priv->clocks_count);
+ if (err)
+ dev_err(dev, "failed to release all clocks\n");
+
+ return err;
+}
+
+static int ti_sysc_get_clocks(struct udevice *dev)
+{
+ struct ti_sysc_priv *priv = dev_get_priv(dev);
+ int i, err;
+
+ for (i = 0; i < TI_SYSC_MAX_CLOCKS; i++) {
+ err =
