On 10/08/2013 08:21 AM, Laxman Dewangan wrote: > Palmas devices has two clock output CLK32K_KG and CLK32K_KG_AUDIO not all palmas devices have 2 clocks - example: tps659038 > which can be enable/disable through software.
> > Add clock driver support for the Palmas 32KHz clocks. > > Signed-off-by: Laxman Dewangan <[email protected]> > --- > Changes from V1: > - Call prepare if the clk is needed for boot-enable or sleep control. > - change is_enabled to is_prepared. > - Added ops palmas_clks_recalc_rate. > - Added of_clk_add_provider(). > > Changes from V2: > - Convert magic number to defines. > > .../devicetree/bindings/clock/clk-palmas.txt | 45 +++ > drivers/clk/Kconfig | 7 + > drivers/clk/Makefile | 1 + > drivers/clk/clk-palmas.c | 340 > ++++++++++++++++++++ http://www.spinics.net/lists/devicetree/msg04855.html Do we do 2 patches now? one seperate for binding and implementation? What is our current preference now a days? > 4 files changed, 393 insertions(+), 0 deletions(-) > create mode 100644 Documentation/devicetree/bindings/clock/clk-palmas.txt > create mode 100644 drivers/clk/clk-palmas.c > > diff --git a/Documentation/devicetree/bindings/clock/clk-palmas.txt > b/Documentation/devicetree/bindings/clock/clk-palmas.txt > new file mode 100644 > index 0000000..c247538 > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/clk-palmas.txt > @@ -0,0 +1,45 @@ > +* Palmas 32KHz clocks * > + > +Palmas device has two clock output pins for 32KHz, KG and KG_AUDIO. > + > +This binding uses the common clock binding ./clock-bindings.txt. proper link would be to provide Documentation/devicetree/bindings/clock/clock-bindings.txt ? > + > +Clock 32KHz KG is output 0 of the driver and clock 32KHz is output 1. > + > +Required properties: > +- compatible : shall be "ti,palmas-clk". To handle variants of Palmas chips in production, you'd want to be specific here clk32k_kg and clk32k_kg_audio. > +- #clock-cells : from common clock binding; shall be set to 1. > + > +Optional subnode: > + The clock node has optional subnode to provide the init configuration of > + clocks like boot enable, sleep control. > + > + The subnode name is fixed and it should be > + clk32k_kg for the 32KHz KG clock. > + clk32k_kg_audio for the 32KHz KG_AUDIO clock. > + > + Optional subnode properties: > + ti,clock-boot-enable: Enable clock at the time of booting. Dumb question: Why is this needed? should'nt relevant drivers do a clk_get to enable the relevant clocks? > + ti,external-sleep-control: The clock is enable/disabled by state > + of external enable input pins ENABLE, ENABLE2 and NSLEEP. > + The valid value for the external pins are: > + 1 for ENABLE1 > + 2 for ENABLE2 > + 3 for NSLEEP. could we not have macros for readability? > + Option 0 or missing this property means the clock is > + enabled/disabled via register access and these pins do > + not have any control. > + > +Example: > + clock { > + compatible = "ti,palmas-clk"; > + #clock-cells = <1>; > + clk32k_kg { > + ti,clock-boot-enable; > + ti,external-sleep-control = <3>; > + }; > + > + clk32k_kg_audio { > + ti,clock-boot-enable; > + }; > + }; > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > index 279407a..6b8c233 100644 > --- a/drivers/clk/Kconfig > +++ b/drivers/clk/Kconfig > @@ -93,6 +93,13 @@ config CLK_PPC_CORENET > This adds the clock driver support for Freescale PowerPC corenet > platforms using common clock framework. > > +config COMMON_CLK_PALMAS > + tristate "Clock driver for TI Palmas devices" > + depends on MFD_PALMAS > + ---help--- > + This driver supports TI Palmas devices 32KHz output KG and KG_AUDIO > + using common clock framework. > + > endmenu > > source "drivers/clk/mvebu/Kconfig" > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile > index 7b11106..32e04cf 100644 > --- a/drivers/clk/Makefile > +++ b/drivers/clk/Makefile > @@ -43,3 +43,4 @@ obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o > obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o > obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o > obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o > +obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o > diff --git a/drivers/clk/clk-palmas.c b/drivers/clk/clk-palmas.c > new file mode 100644 > index 0000000..3e070b2 > --- /dev/null > +++ b/drivers/clk/clk-palmas.c > @@ -0,0 +1,340 @@ > +/* > + * Clock driver for Palmas device. > + * > + * Copyright (c) 2013, NVIDIA Corporation. > + * > + * Author: Laxman Dewangan <[email protected]> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation version 2. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, > + * whether express or implied; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA > + * 02111-1307, USA > + */ > + > +#include <linux/clk.h> > +#include <linux/clkdev.h> > +#include <linux/clk-provider.h> > +#include <linux/mfd/palmas.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > + > +enum PALMAS_CLOCK32K { > + PALMAS_CLOCK32KG, > + PALMAS_CLOCK32KG_AUDIO, > + > + /* Last entry */ > + PALMAS_CLOCK32K_NR, > +}; you should be able to get rid of this entirely > + > +#define PALMAS_CLOCK_DT_EXT_CONTROL_ENABLE1 1 > +#define PALMAS_CLOCK_DT_EXT_CONTROL_ENABLE2 2 > +#define PALMAS_CLOCK_DT_EXT_CONTROL_NSLEEP 3 > + > +struct palmas_clks; > + > +struct palmas_clk32k_desc { > + const char *clk_name; > + unsigned int control_reg; > + unsigned int enable_mask; > + unsigned int sleep_mask; > + unsigned int sleep_reqstr_id; > +}; > + > +struct palmas_clock_info { > + struct clk *clk; > + struct clk_hw hw; > + struct palmas_clk32k_desc *clk_desc; > + struct palmas_clks *palmas_clk; > + int ext_control_pin; > + bool boot_enable; > +}; > + > +struct palmas_clks { > + struct device *dev; > + struct palmas *palmas; > + struct clk_onecell_data clk_data; > + struct palmas_clock_info clk_info[PALMAS_CLOCK32K_NR]; > +}; > + > +static struct palmas_clk32k_desc palmas_clk32k_descs[] = { > + { > + .clk_name = "clk32k_kg", > + .control_reg = PALMAS_CLK32KG_CTRL, > + .enable_mask = PALMAS_CLK32KG_CTRL_MODE_ACTIVE, > + .sleep_mask = PALMAS_CLK32KG_CTRL_MODE_SLEEP, > + .sleep_reqstr_id = PALMAS_EXTERNAL_REQSTR_ID_CLK32KG, > + }, { > + .clk_name = "clk32k_kg_audio", > + .control_reg = PALMAS_CLK32KGAUDIO_CTRL, > + .enable_mask = PALMAS_CLK32KG_CTRL_MODE_ACTIVE, > + .sleep_mask = PALMAS_CLK32KG_CTRL_MODE_SLEEP, > + .sleep_reqstr_id = PALMAS_EXTERNAL_REQSTR_ID_CLK32KGAUDIO, > + }, > +}; > + > +static inline struct palmas_clock_info *to_palmas_clks_info(struct clk_hw > *hw) > +{ > + return container_of(hw, struct palmas_clock_info, hw); > +} > + > +static unsigned long palmas_clks_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + return 32768; > +} > + > +static int palmas_clks_prepare(struct clk_hw *hw) > +{ > + struct palmas_clock_info *cinfo = to_palmas_clks_info(hw); > + struct palmas_clks *palmas_clks = cinfo->palmas_clk; > + int ret; > + > + ret = palmas_update_bits(palmas_clks->palmas, PALMAS_RESOURCE_BASE, > + cinfo->clk_desc->control_reg, > + cinfo->clk_desc->enable_mask, > + cinfo->clk_desc->enable_mask); > + if (ret < 0) > + dev_err(palmas_clks->dev, "Reg 0x%02x update failed, %d\n", > + cinfo->clk_desc->control_reg, ret); > + > + return ret; > +} > + > +static void palmas_clks_unprepare(struct clk_hw *hw) > +{ > + struct palmas_clock_info *cinfo = to_palmas_clks_info(hw); > + struct palmas_clks *palmas_clks = cinfo->palmas_clk; > + int ret; > + > + /* > + * Clock can be disabled through external pin if it is externally > + * controlled. > + */ > + if (cinfo->ext_control_pin) > + return; > + > + ret = palmas_update_bits(palmas_clks->palmas, PALMAS_RESOURCE_BASE, > + cinfo->clk_desc->control_reg, > + cinfo->clk_desc->enable_mask, 0); > + if (ret < 0) > + dev_err(palmas_clks->dev, "Reg 0x%02x update failed, %d\n", > + cinfo->clk_desc->control_reg, ret); > + > +} > + > +static int palmas_clks_is_prepared(struct clk_hw *hw) > +{ > + struct palmas_clock_info *cinfo = to_palmas_clks_info(hw); > + struct palmas_clks *palmas_clks = cinfo->palmas_clk; > + int ret; > + u32 val; > + > + if (cinfo->ext_control_pin) > + return 1; > + > + ret = palmas_read(palmas_clks->palmas, PALMAS_RESOURCE_BASE, > + cinfo->clk_desc->control_reg, &val); > + if (ret < 0) { > + dev_err(palmas_clks->dev, "Reg 0x%02x read failed, %d\n", > + cinfo->clk_desc->control_reg, ret); > + return ret; > + } > + return !!(val & cinfo->clk_desc->enable_mask); > +} > + > +static struct clk_ops palmas_clks_ops = { > + .prepare = palmas_clks_prepare, > + .unprepare = palmas_clks_unprepare, > + .is_prepared = palmas_clks_is_prepared, > + .recalc_rate = palmas_clks_recalc_rate, > +}; > + > +static struct clk_init_data palmas_clks_hw_init[PALMAS_CLOCK32K_NR] = { > + [PALMAS_CLOCK32KG] = { > + .name = "clk32k_kg", > + .ops = &palmas_clks_ops, > + .flags = CLK_IS_ROOT | CLK_IGNORE_UNUSED, > + }, > + [PALMAS_CLOCK32KG_AUDIO] = { > + .name = "clk32k_kg_audio", > + .ops = &palmas_clks_ops, > + .flags = CLK_IS_ROOT | CLK_IGNORE_UNUSED, > + }, > +}; if we had two compatible properties, then we would not need this. > + > +static int palmas_clks_get_clk_data(struct platform_device *pdev, > + struct palmas_clks *palmas_clks) > +{ > + struct device_node *node = pdev->dev.of_node; > + struct device_node *child; > + struct palmas_clock_info *cinfo; > + unsigned int prop; > + int ret; > + int i; > + > + for (i = 0; i < PALMAS_CLOCK32K_NR; ++i) { > + child = of_get_child_by_name(node, > + palmas_clk32k_descs[i].clk_name); > + if (!child) > + continue; > + > + cinfo = &palmas_clks->clk_info[i]; > + cinfo->boot_enable = of_property_read_bool(child, > + "ti,clock-boot-enable"); > + ret = of_property_read_u32(child, "ti,external-sleep-control", > + &prop); > + if (!ret) { > + switch (prop) { > + case PALMAS_CLOCK_DT_EXT_CONTROL_ENABLE1: > + prop = PALMAS_EXT_CONTROL_ENABLE1; > + break; > + case PALMAS_CLOCK_DT_EXT_CONTROL_ENABLE2: > + prop = PALMAS_EXT_CONTROL_ENABLE2; > + break; > + case PALMAS_CLOCK_DT_EXT_CONTROL_NSLEEP: > + prop = PALMAS_EXT_CONTROL_NSLEEP; > + break; > + default: > + WARN_ON(1); > + dev_warn(&pdev->dev, > + "%s: Invalid ext control option: %u\n", > + child->name, prop); > + prop = 0; > + break; > + } > + cinfo->ext_control_pin = prop; > + } > + } > + > + return 0; > +} > + > +static int palmas_clks_init_configure(struct palmas_clock_info *cinfo) > +{ > + struct palmas_clks *palmas_clks = cinfo->palmas_clk; > + int ret; > + > + if (cinfo->boot_enable || cinfo->ext_control_pin) { > + ret = clk_prepare(cinfo->clk); > + if (ret < 0) { > + dev_err(palmas_clks->dev, > + "Clock prep failed, %d\n", ret); > + return ret; > + } > + } > + > + ret = palmas_update_bits(palmas_clks->palmas, PALMAS_RESOURCE_BASE, > + cinfo->clk_desc->control_reg, > + cinfo->clk_desc->sleep_mask, 0); > + if (ret < 0) { > + dev_err(palmas_clks->dev, "Reg 0x%02x update failed, %d\n", > + cinfo->clk_desc->control_reg, ret); > + return ret; > + } > + > + if (cinfo->ext_control_pin) { > + ret = palmas_ext_control_req_config(palmas_clks->palmas, > + cinfo->clk_desc->sleep_reqstr_id, > + cinfo->ext_control_pin, true); > + if (ret < 0) { > + dev_err(palmas_clks->dev, > + "Ext config for %s failed, %d\n", > + cinfo->clk_desc->clk_name, ret); > + return ret; > + } > + } > + > + return ret; > +} > + > +static int palmas_clks_probe(struct platform_device *pdev) > +{ > + struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); > + struct palmas_clock_info *cinfo; > + struct palmas_clks *palmas_clks; > + struct clk *clk; > + int i, ret; > + > + palmas_clks = devm_kzalloc(&pdev->dev, sizeof(*palmas_clks), > + GFP_KERNEL); > + if (!palmas_clks) > + return -ENOMEM; > + > + palmas_clks->clk_data.clks = devm_kzalloc(&pdev->dev, > + PALMAS_CLOCK32K_NR * sizeof(palmas_clks->clk_data.clks), > + GFP_KERNEL); > + if (!palmas_clks->clk_data.clks) > + return -ENOMEM; > + > + palmas_clks_get_clk_data(pdev, palmas_clks); > + platform_set_drvdata(pdev, palmas_clks); > + > + palmas_clks->dev = &pdev->dev; > + palmas_clks->palmas = palmas; > + > + for (i = 0; i < PALMAS_CLOCK32K_NR; i++) { > + cinfo = &palmas_clks->clk_info[i]; > + cinfo->clk_desc = &palmas_clk32k_descs[i]; > + cinfo->hw.init = &palmas_clks_hw_init[i]; > + cinfo->palmas_clk = palmas_clks; > + clk = devm_clk_register(&pdev->dev, &cinfo->hw); > + if (IS_ERR(clk)) { > + ret = PTR_ERR(clk); > + dev_err(&pdev->dev, "Fail to register clock %s, %d\n", > + palmas_clk32k_descs[i].clk_name, ret); > + return ret; > + } > + > + cinfo->clk = clk; > + palmas_clks->clk_data.clks[i] = clk; > + palmas_clks->clk_data.clk_num++; > + palmas_clks_init_configure(cinfo); we dont handle error here? > + } > + > + ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get, > + &palmas_clks->clk_data); > + if (ret < 0) > + dev_err(&pdev->dev, "Fail to add clock driver, %d\n", ret); > + return ret; > +} > + > +static int palmas_clks_remove(struct platform_device *pdev) > +{ > + of_clk_del_provider(pdev->dev.of_node); > + return 0; > +} > + > +static struct of_device_id of_palmas_clks_match_tbl[] = { > + { .compatible = "ti,palmas-clk", }, you could use match_data to map required data into the system.. > + {}, > +}; > +MODULE_DEVICE_TABLE(of, of_palmas_clks_match_tbl); > + > +static struct platform_driver palmas_clks_driver = { > + .driver = { > + .name = "palmas-clk", > + .owner = THIS_MODULE, > + .of_match_table = of_palmas_clks_match_tbl, > + }, > + .probe = palmas_clks_probe, > + .remove = palmas_clks_remove, > +}; > + > +module_platform_driver(palmas_clks_driver); > + > +MODULE_DESCRIPTION("Clock driver for Palmas Series Devices"); > +MODULE_ALIAS("platform:palmas-clk"); > +MODULE_AUTHOR("Laxman Dewangan <[email protected]>"); > +MODULE_LICENSE("GPL v2"); > I wonder if we can simplify this with CLK_OF_DECLARE - I suppose it wont work if of_clk_init(NULL); was invoked previously. -- Regards, Nishanth Menon -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
