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[PATCH 08/17] clk: Add PLX Technology OXNAS Standard Clocks

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  [PATCH 08/17] clk: Add PLX Technology OXNAS Standard Clocks Neil Armstrong <narmstrong@baylibre.com> - 2016-03-03 13:00 +0100
    Re: [PATCH 08/17] clk: Add PLX Technology OXNAS Standard Clocks Stephen Boyd <sboyd@codeaurora.org> - 2016-03-04 03:30 +0100
      Re: [PATCH 08/17] clk: Add PLX Technology OXNAS Standard Clocks Neil Armstrong <narmstrong@baylibre.com> - 2016-03-07 12:30 +0100

#1349047 — [PATCH 08/17] clk: Add PLX Technology OXNAS Standard Clocks

Add PLX Technology OXNAS SoC Family Standard Clocks support.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/clk/Kconfig     |   6 ++
 drivers/clk/Makefile    |   1 +
 drivers/clk/clk-oxnas.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 166 insertions(+)
 create mode 100644 drivers/clk/clk-oxnas.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index eca8e01..b75ef5c 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -192,6 +192,12 @@ config COMMON_CLK_PXA
 	---help---
 	  Sypport for the Marvell PXA SoC.
 
+config COMMON_CLK_OXNAS
+	def_bool COMMON_CLK
+	select MFD_SYSCON
+	---help---
+	  Sypport for the OXNAS SoC Family clocks.
+
 config COMMON_CLK_CDCE706
 	tristate "Clock driver for TI CDCE706 clock synthesizer"
 	depends on I2C
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index bae4be6..a5d45d8 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_ARCH_MB86S7X)		+= clk-mb86s7x.o
 obj-$(CONFIG_ARCH_MOXART)		+= clk-moxart.o
 obj-$(CONFIG_ARCH_NOMADIK)		+= clk-nomadik.o
 obj-$(CONFIG_ARCH_NSPIRE)		+= clk-nspire.o
+obj-$(CONFIG_COMMON_CLK_OXNAS)		+= clk-oxnas.o
 obj-$(CONFIG_COMMON_CLK_PALMAS)		+= clk-palmas.o
 obj-$(CONFIG_CLK_QORIQ)			+= clk-qoriq.o
 obj-$(CONFIG_COMMON_CLK_RK808)		+= clk-rk808.o
diff --git a/drivers/clk/clk-oxnas.c b/drivers/clk/clk-oxnas.c
new file mode 100644
index 0000000..c4b903f
--- /dev/null
+++ b/drivers/clk/clk-oxnas.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2010 Broadcom
+ * Copyright (C) 2012 Stephen Warren
+ * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/stringify.h>
+#include <linux/reset.h>
+#include <linux/io.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+/* Standard regmap gate clocks */
+struct clk_std {
+	struct clk_hw hw;
+	signed char bit;
+	struct regmap *regmap;
+};
+
+/* Regmap offsets */
+#define CLK_STAT_REGOFFSET	0x24
+#define CLK_SET_REGOFFSET	0x2c
+#define CLK_CLR_REGOFFSET	0x30
+
+#define NUM_STD_CLKS 10
+#define to_stdclk(_hw) container_of(_hw, struct clk_std, hw)
+
+static int std_clk_is_enabled(struct clk_hw *hw)
+{
+	struct clk_std *std = to_stdclk(hw);
+	int ret;
+	unsigned int val;
+
+	ret = regmap_read(std->regmap, CLK_STAT_REGOFFSET, &val);
+	if (ret < 0)
+		return ret;
+
+	return val & BIT(std->bit);
+}
+
+static int std_clk_enable(struct clk_hw *hw)
+{
+	struct clk_std *std = to_stdclk(hw);
+
+	regmap_write(std->regmap, CLK_SET_REGOFFSET, BIT(std->bit));
+
+	return 0;
+}
+
+static void std_clk_disable(struct clk_hw *hw)
+{
+	struct clk_std *std = to_stdclk(hw);
+
+	regmap_write(std->regmap, CLK_CLR_REGOFFSET, BIT(std->bit));
+}
+
+static struct clk_ops std_clk_ops = {
+	.enable = std_clk_enable,
+	.disable = std_clk_disable,
+	.is_enabled = std_clk_is_enabled,
+};
+
+static const char *const std_clk_parents[] = {
+	"oscillator",
+};
+
+static const char *const eth_parents[] = {
+	"gmacclk",
+};
+
+#define DECLARE_STD_CLKP(__clk, __bit, __parent)	\
+static struct clk_init_data clk_##__clk##_init = {	\
+	.name = __stringify(__clk),			\
+	.ops = &std_clk_ops,				\
+	.parent_names = __parent,		\
+	.num_parents = ARRAY_SIZE(__parent),	\
+};							\
+							\
+static struct clk_std clk_##__clk = {			\
+	.bit = __bit,					\
+	.hw = {						\
+		.init = &clk_##__clk##_init,		\
+	},						\
+}
+
+#define DECLARE_STD_CLK(__clk, __bit) DECLARE_STD_CLKP(__clk, __bit, \
+							std_clk_parents)
+
+DECLARE_STD_CLK(leon, 0);
+DECLARE_STD_CLK(dma_sgdma, 1);
+DECLARE_STD_CLK(cipher, 2);
+/* DECLARE_STD_CLK(sd, 3); - Do not touch DDR clock */
+DECLARE_STD_CLK(sata, 4);
+DECLARE_STD_CLK(audio, 5);
+DECLARE_STD_CLK(usbmph, 6);
+DECLARE_STD_CLKP(etha, 7, eth_parents);
+DECLARE_STD_CLK(pciea, 8);
+DECLARE_STD_CLK(nand, 9);
+
+static struct clk_hw *std_clk_hw_tbl[] = {
+	&clk_leon.hw,
+	&clk_dma_sgdma.hw,
+	&clk_cipher.hw,
+	&clk_sata.hw,
+	&clk_audio.hw,
+	&clk_usbmph.hw,
+	&clk_etha.hw,
+	&clk_pciea.hw,
+	&clk_nand.hw,
+};
+
+static struct clk *std_clk_tbl[ARRAY_SIZE(std_clk_hw_tbl)];
+
+static struct clk_onecell_data std_clk_data;
+
+static void __init oxnas_init_stdclk(struct device_node *np)
+{
+	int i;
+	struct regmap *regmap = syscon_node_to_regmap(of_get_parent(np));
+
+	if (!regmap)
+		panic("failed to have parent regmap\n");
+
+	for (i = 0; i < ARRAY_SIZE(std_clk_hw_tbl); i++) {
+		struct clk_std *std = container_of(std_clk_hw_tbl[i],
+						   struct clk_std, hw);
+
+		if (WARN_ON(!std))
+			return;
+		std->regmap = regmap;
+
+		std_clk_tbl[i] = clk_register(NULL, std_clk_hw_tbl[i]);
+		if (WARN_ON(IS_ERR(std_clk_tbl[i])))
+			return;
+	}
+
+	std_clk_data.clks = std_clk_tbl;
+	std_clk_data.clk_num = ARRAY_SIZE(std_clk_tbl);
+
+	of_clk_add_provider(np, of_clk_src_onecell_get, &std_clk_data);
+}
+CLK_OF_DECLARE(oxnas_pllstd, "plxtech,ox810se-stdclk", oxnas_init_stdclk);
-- 
1.9.1

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#1349790

On 03/03, Neil Armstrong wrote:
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index eca8e01..b75ef5c 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -192,6 +192,12 @@ config COMMON_CLK_PXA
>  	---help---
>  	  Sypport for the Marvell PXA SoC.
>  
> +config COMMON_CLK_OXNAS
> +	def_bool COMMON_CLK
> +	select MFD_SYSCON

So this is always built if I have the common clk framework
enabled? Not good.

> +	---help---
> +	  Sypport for the OXNAS SoC Family clocks.
> +
>  config COMMON_CLK_CDCE706
>  	tristate "Clock driver for TI CDCE706 clock synthesizer"
>  	depends on I2C
> diff --git a/drivers/clk/clk-oxnas.c b/drivers/clk/clk-oxnas.c
> new file mode 100644
> index 0000000..c4b903f
> --- /dev/null
> +++ b/drivers/clk/clk-oxnas.c
> @@ -0,0 +1,159 @@
> +/*
> + * Copyright (C) 2010 Broadcom
> + * Copyright (C) 2012 Stephen Warren
> + * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; 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, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>

Are either of these includes used?

> +#include <linux/clk-provider.h>
> +#include <linux/of.h>
> +#include <linux/delay.h>

Is this include used?

> +#include <linux/stringify.h>
> +#include <linux/reset.h>

Is this include used?

> +#include <linux/io.h>

Is this include used?

> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>

#include <linux/kernel.h> for container_of?

> +
> +/* Standard regmap gate clocks */
> +struct clk_std {
> +	struct clk_hw hw;
> +	signed char bit;
> +	struct regmap *regmap;
> +};
> +
> +/* Regmap offsets */
> +#define CLK_STAT_REGOFFSET	0x24
> +#define CLK_SET_REGOFFSET	0x2c
> +#define CLK_CLR_REGOFFSET	0x30
> +
> +#define NUM_STD_CLKS 10
> +#define to_stdclk(_hw) container_of(_hw, struct clk_std, hw)
> +
> +static int std_clk_is_enabled(struct clk_hw *hw)
> +{
> +	struct clk_std *std = to_stdclk(hw);
> +	int ret;
> +	unsigned int val;
> +
> +	ret = regmap_read(std->regmap, CLK_STAT_REGOFFSET, &val);
> +	if (ret < 0)
> +		return ret;
> +
> +	return val & BIT(std->bit);
> +}
> +
> +static int std_clk_enable(struct clk_hw *hw)
> +{
> +	struct clk_std *std = to_stdclk(hw);
> +
> +	regmap_write(std->regmap, CLK_SET_REGOFFSET, BIT(std->bit));

I hope the regmap is fast_io? Otherwise this is scheduling while
atomic.

> +
> +	return 0;
> +}
> +
> +static void std_clk_disable(struct clk_hw *hw)
> +{
> +	struct clk_std *std = to_stdclk(hw);
> +
> +	regmap_write(std->regmap, CLK_CLR_REGOFFSET, BIT(std->bit));
> +}
> +
> +static struct clk_ops std_clk_ops = {

const?

> +	.enable = std_clk_enable,
> +	.disable = std_clk_disable,
> +	.is_enabled = std_clk_is_enabled,
> +};
> +
[..]
> +
> +static struct clk_hw *std_clk_hw_tbl[] = {

const?

> +	&clk_leon.hw,
> +	&clk_dma_sgdma.hw,
> +	&clk_cipher.hw,
> +	&clk_sata.hw,
> +	&clk_audio.hw,
> +	&clk_usbmph.hw,
> +	&clk_etha.hw,
> +	&clk_pciea.hw,
> +	&clk_nand.hw,
> +};
> +
> +static struct clk *std_clk_tbl[ARRAY_SIZE(std_clk_hw_tbl)];
> +
> +static struct clk_onecell_data std_clk_data;

These are pretty generic. Perhaps oxnas_clk_data and
oxnas_clk_hw_tbl?

> +
> +static void __init oxnas_init_stdclk(struct device_node *np)
> +{
> +	int i;
> +	struct regmap *regmap = syscon_node_to_regmap(of_get_parent(np));
> +
> +	if (!regmap)
> +		panic("failed to have parent regmap\n");
> +
> +	for (i = 0; i < ARRAY_SIZE(std_clk_hw_tbl); i++) {
> +		struct clk_std *std = container_of(std_clk_hw_tbl[i],
> +						   struct clk_std, hw);
> +
> +		if (WARN_ON(!std))
> +			return;
> +		std->regmap = regmap;
> +
> +		std_clk_tbl[i] = clk_register(NULL, std_clk_hw_tbl[i]);
> +		if (WARN_ON(IS_ERR(std_clk_tbl[i])))
> +			return;
> +	}
> +
> +	std_clk_data.clks = std_clk_tbl;
> +	std_clk_data.clk_num = ARRAY_SIZE(std_clk_tbl);
> +
> +	of_clk_add_provider(np, of_clk_src_onecell_get, &std_clk_data);
> +}
> +CLK_OF_DECLARE(oxnas_pllstd, "plxtech,ox810se-stdclk", oxnas_init_stdclk);

Can this be a platform driver instead?

Is there a binding for this compatible?

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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#1351547

On 03/04/2016 03:25 AM, Stephen Boyd wrote:
> On 03/03, Neil Armstrong wrote:
>> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
>> index eca8e01..b75ef5c 100644
>> --- a/drivers/clk/Kconfig
>> +++ b/drivers/clk/Kconfig
>> @@ -192,6 +192,12 @@ config COMMON_CLK_PXA
>>  	---help---
>>  	  Sypport for the Marvell PXA SoC.
>>  
>> +config COMMON_CLK_OXNAS
>> +	def_bool COMMON_CLK
>> +	select MFD_SYSCON
> 
> So this is always built if I have the common clk framework
> enabled? Not good.
Fixed.

>> +#include <linux/clk.h>
>> +#include <linux/clkdev.h>
> 
> Are either of these includes used?
> 
>> +#include <linux/clk-provider.h>
>> +#include <linux/of.h>
>> +#include <linux/delay.h>
> 
> Is this include used?
> 
>> +#include <linux/stringify.h>
>> +#include <linux/reset.h>
> 
> Is this include used?
> 
>> +#include <linux/io.h>
> 
> Is this include used?
> 
>> +#include <linux/regmap.h>
>> +#include <linux/mfd/syscon.h>
> 
> #include <linux/kernel.h> for container_of?

Fixed an cleaned up, thanks.


>> +static int std_clk_enable(struct clk_hw *hw)
>> +{
>> +	struct clk_std *std = to_stdclk(hw);
>> +
>> +	regmap_write(std->regmap, CLK_SET_REGOFFSET, BIT(std->bit));
> 
> I hope the regmap is fast_io? Otherwise this is scheduling while
> atomic.
Yes, but due to the nature of the registers, I can't use the clk-regmap module.

>> +
>> +	return 0;
>> +}
>> +
>> +static void std_clk_disable(struct clk_hw *hw)
>> +{
>> +	struct clk_std *std = to_stdclk(hw);
>> +
>> +	regmap_write(std->regmap, CLK_CLR_REGOFFSET, BIT(std->bit));
>> +}
>> +
>> +static struct clk_ops std_clk_ops = {
> 
> const?
> 
>> +	.enable = std_clk_enable,
>> +	.disable = std_clk_disable,
>> +	.is_enabled = std_clk_is_enabled,
>> +};
>> +
> [..]
>> +
>> +static struct clk_hw *std_clk_hw_tbl[] = {
> 
> const?
> 
>> +	&clk_leon.hw,
>> +	&clk_dma_sgdma.hw,
>> +	&clk_cipher.hw,
>> +	&clk_sata.hw,
>> +	&clk_audio.hw,
>> +	&clk_usbmph.hw,
>> +	&clk_etha.hw,
>> +	&clk_pciea.hw,
>> +	&clk_nand.hw,
>> +};
>> +
>> +static struct clk *std_clk_tbl[ARRAY_SIZE(std_clk_hw_tbl)];
>> +
>> +static struct clk_onecell_data std_clk_data;
> 
> These are pretty generic. Perhaps oxnas_clk_data and
> oxnas_clk_hw_tbl?
> 
>> +
>> +static void __init oxnas_init_stdclk(struct device_node *np)
>> +{
>> +	int i;
>> +	struct regmap *regmap = syscon_node_to_regmap(of_get_parent(np));
>> +
>> +	if (!regmap)
>> +		panic("failed to have parent regmap\n");
>> +
>> +	for (i = 0; i < ARRAY_SIZE(std_clk_hw_tbl); i++) {
>> +		struct clk_std *std = container_of(std_clk_hw_tbl[i],
>> +						   struct clk_std, hw);
>> +
>> +		if (WARN_ON(!std))
>> +			return;
>> +		std->regmap = regmap;
>> +
>> +		std_clk_tbl[i] = clk_register(NULL, std_clk_hw_tbl[i]);
>> +		if (WARN_ON(IS_ERR(std_clk_tbl[i])))
>> +			return;
>> +	}
>> +
>> +	std_clk_data.clks = std_clk_tbl;
>> +	std_clk_data.clk_num = ARRAY_SIZE(std_clk_tbl);
>> +
>> +	of_clk_add_provider(np, of_clk_src_onecell_get, &std_clk_data);
>> +}
>> +CLK_OF_DECLARE(oxnas_pllstd, "plxtech,ox810se-stdclk", oxnas_init_stdclk);
> 
> Can this be a platform driver instead?
> 
> Is there a binding for this compatible?

I refactored the driver to be platform driver and cleaned up the structure to be const and allocate the clocks at probe.

The bindings was in a separate patch, I forgot to CC linux-clk :
http://lkml.kernel.org/r/1457005210-18485-10-git-send-email-narmstrong@baylibre.com

In the meantime I added the indices description in the bindings.

Neil

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