On 25/08/20 2:51 pm, Dario Binacchi wrote:
The implementation of this driver was needed to bind the device tree sub-nodes of the 'clocks' node. In fact, the lack of the compatible property in the 'clocks' node does not allow the generic 'syscon' or 'simple-bus' drivers linked to the 'scm_conf@0' node to bind the 'clocks' node and in turn its sub-nodes. The 'scm@210000' node is therefore the node closest to the 'clocks' node whose driver can bind all the 'clocks' sub-nodes.
scm: scm@210000 { compatible = "ti,am3-scm", "simple-bus"; ...
scm_conf: scm_conf@0 { compatible = "syscon", "simple-bus"; #address-cells = <1>; #size-cells = <1>; ranges = <0 0 0x800>;
scm_clocks: clocks { #address-cells = <1>; #size-cells = <0>; };}; };
Signed-off-by: Dario Binacchi dariobin@libero.it
doc/device-tree-bindings/arm/omap,ctrl.txt | 82 ++++++ .../pinctrl/pinctrl-single.txt | 255 ++++++++++++++++++
This documentation does not belong to this patch.
drivers/misc/Kconfig | 7 + drivers/misc/Makefile | 1 + drivers/misc/ti-am3-scm.c | 90 +++++++ 5 files changed, 435 insertions(+) create mode 100644 doc/device-tree-bindings/arm/omap,ctrl.txt create mode 100644 doc/device-tree-bindings/pinctrl/pinctrl-single.txt create mode 100644 drivers/misc/ti-am3-scm.c
diff --git a/doc/device-tree-bindings/arm/omap,ctrl.txt b/doc/device-tree-bindings/arm/omap,ctrl.txt new file mode 100644 index 0000000000..8efd321cfa --- /dev/null +++ b/doc/device-tree-bindings/arm/omap,ctrl.txt @@ -0,0 +1,82 @@ +OMAP Control Module bindings
+Control Module contains miscellaneous features under it based on SoC type. +Pincontrol is one common feature, and it has a specialized support +described in [1]. Typically some clock nodes are also under control module. +Syscon is used to share register level access to drivers external to +control module driver itself.
+See [2] for documentation about clock/clockdomain nodes.
+[1] doc/device-tree-bindings/pinctrl/pinctrl-single.txt +[2] doc/device-tree-bindings/clock/ti,*.txt
+Required properties: +- compatible: Must be one of:
"ti,am3-scm""ti,am4-scm""ti,dm814-scrm""ti,dm816-scrm""ti,omap2-scm""ti,omap3-scm""ti,omap4-scm-core""ti,omap4-scm-padconf-core""ti,omap4-scm-wkup""ti,omap4-scm-padconf-wkup""ti,omap5-scm-core""ti,omap5-scm-padconf-core""ti,omap5-scm-wkup-pad-conf""ti,dra7-scm-core"+- reg: Contains Control Module register address range
(base address and length)+Optional properties: +- clocks: clocks for this module +- clockdomains: clockdomains for this module
+Examples:
+scm: scm@2000 {
- compatible = "ti,omap3-scm", "simple-bus";
- reg = <0x2000 0x2000>;
- #address-cells = <1>;
- #size-cells = <1>;
- ranges = <0 0x2000 0x2000>;
- omap3_pmx_core: pinmux@30 {
compatible = "ti,omap3-padconf","pinctrl-single";reg = <0x30 0x230>;#address-cells = <1>;#size-cells = <0>;#interrupt-cells = <1>;interrupt-controller;pinctrl-single,register-width = <16>;pinctrl-single,function-mask = <0xff1f>;- };
- scm_conf: scm_conf@270 {
compatible = "syscon";reg = <0x270 0x330>;#address-cells = <1>;#size-cells = <1>;scm_clocks: clocks {#address-cells = <1>;#size-cells = <0>;};- };
- scm_clockdomains: clockdomains {
- };
+}
+&scm_clocks {
- mcbsp5_mux_fck: mcbsp5_mux_fck {
#clock-cells = <0>;compatible = "ti,composite-mux-clock";clocks = <&core_96m_fck>, <&mcbsp_clks>;ti,bit-shift = <4>;reg = <0x02d8>;- };
+};
[...snip...]
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index b67e906a76..9e8b676637 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -500,4 +500,11 @@ config ESM_PMIC Support ESM (Error Signal Monitor) on PMIC devices. ESM is used typically to reboot the board in error condition.
+config TI_AM3_SCM
- bool "AM33XX specific control module support (SCM)"
- depends on ARCH_OMAP2PLUS
- help
The control module includes status and control logic not addressedwithin the peripherals or the rest of the device infrastructure.endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 947bd3a647..056fb3b522 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -75,3 +75,4 @@ obj-$(CONFIG_MICROCHIP_FLEXCOM) += microchip_flexcom.o obj-$(CONFIG_K3_AVS0) += k3_avs.o obj-$(CONFIG_ESM_K3) += k3_esm.o obj-$(CONFIG_ESM_PMIC) += esm_pmic.o +obj-$(CONFIG_TI_AM3_SCM) += ti-am3-scm.o diff --git a/drivers/misc/ti-am3-scm.c b/drivers/misc/ti-am3-scm.c new file mode 100644 index 0000000000..e5f4f09261 --- /dev/null +++ b/drivers/misc/ti-am3-scm.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*
- AM335x specific control module (scm)
- Copyright (C) 2020 Dario Binacchi dariobin@libero.it
- */
+#include <common.h> +#include <dm.h> +#include <dm/lists.h> +#include <linux/err.h>
+static int ti_am3_scm_bind(struct udevice *dev) +{
- int err;
- struct udevice *conf_dev;
- ofnode clocks_node, conf_node;
- err = dm_scan_fdt_dev(dev);
- if (err) {
dev_err(dev, "%s: dm_scan_fdt, err=%d\n", __func__, err);return err;- }
- conf_node = dev_read_subnode(dev, "scm_conf@0");
- if (!ofnode_valid(conf_node)) {
dev_err(dev, "%s: failed to get conf sub-node\n", __func__);return -ENODEV;- }
- if (uclass_get_device_by_ofnode(UCLASS_SYSCON, conf_node, &conf_dev)) {
if (uclass_get_device_by_ofnode(UCLASS_SIMPLE_BUS, conf_node,&conf_dev)) {dev_err(dev, "%s: failed to get conf device\n",__func__);return -ENODEV;}- }
- clocks_node = dev_read_subnode(conf_dev, "clocks");
- if (!ofnode_valid(clocks_node)) {
dev_err(dev, "%s: failed to get clocks sub-node\n", __func__);return -ENODEV;- }
Isn't clock node an optional property?
Also do we really need a separate UBOOT_DRIVER for scm_clocks? Can it be handled in the same driver?
Thanks and regards, Lokesh
- err = device_bind_driver_to_node(conf_dev, "ti_am3_scm_clocks",
"scm_clocks", clocks_node, NULL);- if (err) {
dev_err(dev, "%s: failed to bind scm_clocks\n", __func__);return err;- }
- return 0;
+}
+static const struct udevice_id ti_am3_scm_ids[] = {
- {.compatible = "ti,am3-scm"},
- {}
+};
+U_BOOT_DRIVER(ti_am3_scm) = {
- .name = "ti_am3_scm",
- .id = UCLASS_SIMPLE_BUS,
- .of_match = ti_am3_scm_ids,
- .bind = ti_am3_scm_bind,
+};
+static int ti_am3_scm_clocks_bind(struct udevice *dev) +{
- ofnode node;
- int err;
- dev_dbg(dev, "%s: dev=%p\n", __func__, dev);
- ofnode_for_each_subnode(node, dev_ofnode(dev)) {
err = lists_bind_fdt(dev, node, NULL, false);if (err) {dev_err(dev, "%s: lists_bind_fdt, err=%d\n",__func__, err);return err;}- }
- return 0;
+}
+U_BOOT_DRIVER(ti_am3_scm_clocks) = {
- .name = "ti_am3_scm_clocks",
- .id = UCLASS_SIMPLE_BUS,
- .bind = ti_am3_scm_clocks_bind,
+};