From 6c3090520554d535db04f807c313d9a4b81a285c Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Tue, 10 Dec 2019 09:21:04 -0800 Subject: [PATCH] clk: ti: clkctrl: Fix hidden dependency to node name We currently have a hidden dependency to the device tree node name for the clkctrl clocks. Instead of using standard node name like "clock", we must use "l4-per-clkctrl" type naming so the clock driver can find the associated clock domain. Further, if "clk" is specified for a clock node name, the driver sets TI_CLK_CLKCTRL_COMPAT flag that uses different logic for the clock name based on the parent node name for the all the clkctrl clocks for the SoC. If the clock node naming dependency is not understood, the related clockdomain is not found, or a wrong one can get used if a clock manager has multiple clock domains. As each clkctrl instance represents a single clock domain, let's allow using domain specific compatible names to specify the clock domain. This simplifies things and removes the hidden dependency to the node name. And then later on, after the node names have been standardized, we can drop the related code for parsing the node names. Let's also update the binding to use standard "clock" node naming instead of "clk" and add the missing description for reg. Cc: devicetree@vger.kernel.org Cc: Rob Herring Signed-off-by: Tony Lindgren Acked-by: Rob Herring Acked-by: Stephen Boyd Signed-off-by: Tero Kristo --- .../devicetree/bindings/clock/ti-clkctrl.txt | 11 ++- drivers/clk/ti/clk.c | 4 +- drivers/clk/ti/clkctrl.c | 96 ++++++++++++++++--- 3 files changed, 96 insertions(+), 15 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/ti-clkctrl.txt b/Documentation/devicetree/bindings/clock/ti-clkctrl.txt index 48ee6991f2cc..18af6b9409e3 100644 --- a/Documentation/devicetree/bindings/clock/ti-clkctrl.txt +++ b/Documentation/devicetree/bindings/clock/ti-clkctrl.txt @@ -16,18 +16,23 @@ For more information, please see the Linux clock framework binding at Documentation/devicetree/bindings/clock/clock-bindings.txt. Required properties : -- compatible : shall be "ti,clkctrl" +- compatible : shall be "ti,clkctrl" or a clock domain specific name: + "ti,clkctrl-l4-cfg" + "ti,clkctrl-l4-per" + "ti,clkctrl-l4-secure" + "ti,clkctrl-l4-wkup" - #clock-cells : shall contain 2 with the first entry being the instance offset from the clock domain base and the second being the clock index +- reg : clock registers Example: Clock controller node on omap 4430: &cm2 { l4per: cm@1400 { cm_l4per@0 { - cm_l4per_clkctrl: clk@20 { - compatible = "ti,clkctrl"; + cm_l4per_clkctrl: clock@20 { + compatible = "ti,clkctrl-l4-per", "ti,clkctrl"; reg = <0x20 0x1b0>; #clock-cells = <2>; }; diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c index e0b8ed3a1e80..3da33c786d77 100644 --- a/drivers/clk/ti/clk.c +++ b/drivers/clk/ti/clk.c @@ -171,7 +171,9 @@ void __init ti_dt_clocks_register(struct ti_dt_clk oclks[]) node = of_find_node_by_name(NULL, buf); if (num_args && compat_mode) { parent = node; - node = of_get_child_by_name(parent, "clk"); + node = of_get_child_by_name(parent, "clock"); + if (!node) + node = of_get_child_by_name(parent, "clk"); of_node_put(parent); } diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c index 17b9a761242f..062266034d84 100644 --- a/drivers/clk/ti/clkctrl.c +++ b/drivers/clk/ti/clkctrl.c @@ -440,6 +440,63 @@ static void __init _clkctrl_add_provider(void *data, of_clk_add_hw_provider(np, _ti_omap4_clkctrl_xlate, data); } +/* Get clock name based on compatible string for clkctrl */ +static char * __init clkctrl_get_name(struct device_node *np) +{ + struct property *prop; + const int prefix_len = 11; + const char *compat; + char *name; + + of_property_for_each_string(np, "compatible", prop, compat) { + if (!strncmp("ti,clkctrl-", compat, prefix_len)) { + /* Two letter minimum name length for l3, l4 etc */ + if (strnlen(compat + prefix_len, 16) < 2) + continue; + name = kasprintf(GFP_KERNEL, "%s", compat + prefix_len); + if (!name) + continue; + strreplace(name, '-', '_'); + + return name; + } + } + of_node_put(np); + + return NULL; +} + +/* Get clkctrl clock base name based on clkctrl_name or dts node */ +static const char * __init clkctrl_get_clock_name(struct device_node *np, + const char *clkctrl_name, + int offset, int index, + bool legacy_naming) +{ + char *clock_name; + + /* l4per-clkctrl:1234:0 style naming based on clkctrl_name */ + if (clkctrl_name && !legacy_naming) { + clock_name = kasprintf(GFP_KERNEL, "%s-clkctrl:%04x:%d", + clkctrl_name, offset, index); + strreplace(clock_name, '_', '-'); + + return clock_name; + } + + /* l4per:1234:0 old style naming based on clkctrl_name */ + if (clkctrl_name) + return kasprintf(GFP_KERNEL, "%s_cm:clk:%04x:%d", + clkctrl_name, offset, index); + + /* l4per_cm:1234:0 old style naming based on parent node name */ + if (legacy_naming) + return kasprintf(GFP_KERNEL, "%pOFn:clk:%04x:%d", + np->parent, offset, index); + + /* l4per-clkctrl:1234:0 style naming based on node name */ + return kasprintf(GFP_KERNEL, "%pOFn:%04x:%d", np, offset, index); +} + static void __init _ti_omap4_clkctrl_setup(struct device_node *node) { struct omap_clkctrl_provider *provider; @@ -448,8 +505,10 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node) struct clk_init_data init = { NULL }; struct clk_hw_omap *hw; struct clk *clk; - struct omap_clkctrl_clk *clkctrl_clk; + struct omap_clkctrl_clk *clkctrl_clk = NULL; const __be32 *addrp; + bool legacy_naming; + char *clkctrl_name; u32 addr; int ret; char *c; @@ -537,7 +596,19 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node) provider->base = of_iomap(node, 0); - if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT) { + legacy_naming = ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT; + clkctrl_name = clkctrl_get_name(node); + if (clkctrl_name) { + provider->clkdm_name = kasprintf(GFP_KERNEL, + "%s_clkdm", clkctrl_name); + goto clkdm_found; + } + + /* + * The code below can be removed when all clkctrl nodes use domain + * specific compatible proprerty and standard clock node naming + */ + if (legacy_naming) { provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFnxxx", node->parent); if (!provider->clkdm_name) { kfree(provider); @@ -573,7 +644,7 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node) *c = '_'; c++; } - +clkdm_found: INIT_LIST_HEAD(&provider->clocks); /* Generate clocks */ @@ -612,15 +683,15 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node) init.flags = 0; if (reg_data->flags & CLKF_SET_RATE_PARENT) init.flags |= CLK_SET_RATE_PARENT; - if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT) - init.name = kasprintf(GFP_KERNEL, "%pOFn:%pOFn:%04x:%d", - node->parent, node, - reg_data->offset, 0); - else - init.name = kasprintf(GFP_KERNEL, "%pOFn:%04x:%d", - node, reg_data->offset, 0); + + init.name = clkctrl_get_clock_name(node, clkctrl_name, + reg_data->offset, 0, + legacy_naming); + if (!init.name) + goto cleanup; + clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL); - if (!init.name || !clkctrl_clk) + if (!clkctrl_clk) goto cleanup; init.ops = &omap4_clkctrl_clk_ops; @@ -642,11 +713,14 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node) if (ret == -EPROBE_DEFER) ti_clk_retry_init(node, provider, _clkctrl_add_provider); + kfree(clkctrl_name); + return; cleanup: kfree(hw); kfree(init.name); + kfree(clkctrl_name); kfree(clkctrl_clk); } CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl", -- 2.39.5