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* [PATCH v8 0/4] clk: meson: add a sub EMMC clock controller support
@ 2018-12-17 16:24 Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 1/4] clk: meson: add one based divider support for sclk divider Jianxin Pan
                   ` (3 more replies)
  0 siblings, 4 replies; 8+ messages in thread
From: Jianxin Pan @ 2018-12-17 16:24 UTC (permalink / raw)
  To: Jerome Brunet, Neil Armstrong
  Cc: Jianxin Pan, Kevin Hilman, Carlo Caione, Michael Turquette,
	Stephen Boyd, Rob Herring, Miquel Raynal, Boris Brezillon,
	Martin Blumenstingl, Yixun Lan, Liang Yang, Jian Hu, Qiufang Dai,
	Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel, devicetree

This driver will add a MMC clock controller driver support.
The original idea about adding a clock controller is during the
discussion in the NAND driver mainline effort[1].

This driver is tested in the S400 board (AXG platform) with NAND driver.

Changes since v7 [8]
 - move meson_clk_get_phase_delay_data() from header to driver
 - CONFIG sclk-div with COMMON_CLK_AMLOGIC instead of COMMON_CLK_AMLOGIC_AUDIO
 - remove onecell date and ID for internal MUX clk
 - use helper for functions for ONE_BASED in sclk-div
 - add ONE_BASED support for duty cycle

Changes since v6 [7]:
 - add one based support for sclk divier
 - alloc sclk in probe for multiple instance
 - fix coding styles

Changes since v5 [6]:
 - remove divider ops with .init and use sclk_div instead
 - drop CLK_DIVIDER_ROUND_CLOSEST in mux and div
 - drop the useless type cast 

Changes since v4 [5]:
 - use struct parm in phase delay driver
 - remove 0 delay releted part in phase delay driver
 - don't rebuild the parent name once again
 - add divider ops with .init

Changes since v3 [4]:
 - separate clk-phase-delay driver
 - replace clk_get_rate() with clk_hw_get_rate()
 - collect Rob's R-Y
 - drop 'meson-' prefix from compatible string

 Changes since v2 [3]:
 - squash dt-binding clock-id patch
 - update license
 - fix alignment
 - construct a clk register helper() function

Changes since v1 [2]:
 - implement phase clock
 - update compatible name
 - adjust file name
 - divider probe() into small functions, and re-use them

[1] https://lkml.kernel.org/r/20180628090034.0637a062@xps13
[2] https://lkml.kernel.org/r/20180703145716.31860-1-yixun.lan@amlogic.com
[3] https://lkml.kernel.org/r/20180710163658.6175-1-yixun.lan@amlogic.com
[4] https://lkml.kernel.org/r/20180712211244.11428-1-yixun.lan@amlogic.com
[5] https://lkml.kernel.org/r/20180809070724.11935-4-yixun.lan@amlogic.com
[6] https://lkml.kernel.org/r/1539839245-13793-1-git-send-email-jianxin.pan@amlogic.com
[7] https://lkml.kernel.org/r/1541089855-19356-1-git-send-email-jianxin.pan@amlogic.com
[8] https://lkml.kernel.org/r/1544457877-51301-1-git-send-email-jianxin.pan@amlogic.com

Jianxin Pan (1):
  clk: meson: add one based divider support for sclk divider

Yixun Lan (3):
  clk: meson: add emmc sub clock phase delay driver
  clk: meson: add DT documentation for emmc clock controller
  clk: meson: add sub MMC clock controller driver

 .../devicetree/bindings/clock/amlogic,mmc-clkc.txt |  39 +++
 drivers/clk/meson/Kconfig                          |   9 +
 drivers/clk/meson/Makefile                         |   5 +-
 drivers/clk/meson/clk-phase-delay.c                |  70 +++++
 drivers/clk/meson/clkc-audio.h                     |   8 -
 drivers/clk/meson/clkc.h                           |  17 +-
 drivers/clk/meson/mmc-clkc.c                       | 304 +++++++++++++++++++++
 drivers/clk/meson/sclk-div.c                       |  59 ++--
 include/dt-bindings/clock/amlogic,mmc-clkc.h       |  17 ++
 9 files changed, 498 insertions(+), 30 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
 create mode 100644 drivers/clk/meson/clk-phase-delay.c
 create mode 100644 drivers/clk/meson/mmc-clkc.c
 create mode 100644 include/dt-bindings/clock/amlogic,mmc-clkc.h

-- 
1.9.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCH v8 1/4] clk: meson: add one based divider support for sclk divider
  2018-12-17 16:24 [PATCH v8 0/4] clk: meson: add a sub EMMC clock controller support Jianxin Pan
@ 2018-12-17 16:24 ` Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 2/4] clk: meson: add emmc sub clock phase delay driver Jianxin Pan
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 8+ messages in thread
From: Jianxin Pan @ 2018-12-17 16:24 UTC (permalink / raw)
  To: Jerome Brunet, Neil Armstrong
  Cc: Jianxin Pan, Kevin Hilman, Carlo Caione, Michael Turquette,
	Stephen Boyd, Rob Herring, Miquel Raynal, Boris Brezillon,
	Martin Blumenstingl, Yixun Lan, Liang Yang, Jian Hu, Qiufang Dai,
	Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel, devicetree

When CLK_DIVIDER_ONE_BASED flag is set, the sclk divider will be:
one based divider (div = val), and zero value gates the clock

Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
---
 drivers/clk/meson/Makefile     |  3 ++-
 drivers/clk/meson/clkc-audio.h |  8 ------
 drivers/clk/meson/clkc.h       | 10 ++++++-
 drivers/clk/meson/sclk-div.c   | 59 ++++++++++++++++++++++++++++--------------
 4 files changed, 50 insertions(+), 30 deletions(-)

diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index a849aa8..acd8694 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -4,7 +4,8 @@
 
 obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid-pll-div.o
 obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o
-obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO)	+= clk-triphase.o sclk-div.o
+obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o
+obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o
 obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o
 obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o
 obj-$(CONFIG_COMMON_CLK_GXBB)	 += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o
diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h
index 0a7c157..286ff12 100644
--- a/drivers/clk/meson/clkc-audio.h
+++ b/drivers/clk/meson/clkc-audio.h
@@ -15,14 +15,6 @@ struct meson_clk_triphase_data {
 	struct parm ph2;
 };
 
-struct meson_sclk_div_data {
-	struct parm div;
-	struct parm hi;
-	unsigned int cached_div;
-	struct clk_duty cached_duty;
-};
-
 extern const struct clk_ops meson_clk_triphase_ops;
-extern const struct clk_ops meson_sclk_div_ops;
 
 #endif /* __MESON_CLKC_AUDIO_H */
diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
index 6183b22..00b3320 100644
--- a/drivers/clk/meson/clkc.h
+++ b/drivers/clk/meson/clkc.h
@@ -27,6 +27,14 @@ struct parm {
 	u8	width;
 };
 
+struct meson_sclk_div_data {
+	struct parm div;
+	struct parm hi;
+	unsigned int cached_div;
+	struct clk_duty cached_duty;
+	u8 flags;
+};
+
 static inline unsigned int meson_parm_read(struct regmap *map, struct parm *p)
 {
 	unsigned int val;
@@ -118,10 +126,10 @@ struct clk_regmap _name = {						\
 extern const struct clk_ops meson_clk_mpll_ops;
 extern const struct clk_ops meson_clk_phase_ops;
 extern const struct clk_ops meson_vid_pll_div_ro_ops;
+extern const struct clk_ops meson_sclk_div_ops;
 
 struct clk_hw *meson_clk_hw_register_input(struct device *dev,
 					   const char *of_name,
 					   const char *clk_name,
 					   unsigned long flags);
-
 #endif /* __CLKC_H */
diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c
index bc64019..a6c425b 100644
--- a/drivers/clk/meson/sclk-div.c
+++ b/drivers/clk/meson/sclk-div.c
@@ -4,42 +4,60 @@
  * Author: Jerome Brunet <jbrunet@baylibre.com>
  *
  * Sample clock generator divider:
- * This HW divider gates with value 0 but is otherwise a zero based divider:
+ * This HW divider gates with value 0
  *
  * val >= 1
- * divider = val + 1
+ * divider = val + 1 if ONE_BASED is not set, otherwise divider = val.
  *
  * The duty cycle may also be set for the LR clock variant. The duty cycle
  * ratio is:
  *
  * hi = [0 - val]
- * duty_cycle = (1 + hi) / (1 + val)
+ * duty_cycle = (1 + hi) / (1 + val) if ONE_BASED is not set, otherwise:
+ * duty_cycle = hi / (1 + val)
  */
 
-#include "clkc-audio.h"
+#include "clkc.h"
 
-static inline struct meson_sclk_div_data *
-meson_sclk_div_data(struct clk_regmap *clk)
+static inline int get_reg(int val, unsigned char flag)
 {
-	return (struct meson_sclk_div_data *)clk->data;
+	WARN_ON(val < 1);
+	if ((flag & CLK_DIVIDER_ONE_BASED) || !val)
+		return val;
+	else
+		return val - 1;
+}
+
+static inline int get_value(int reg, unsigned char flag)
+{
+	if (flag & CLK_DIVIDER_ONE_BASED)
+		return reg;
+	else
+		return reg + 1;
 }
 
-static int sclk_div_maxval(struct meson_sclk_div_data *sclk)
+static inline struct meson_sclk_div_data *
+meson_sclk_div_data(struct clk_regmap *clk)
 {
-	return (1 << sclk->div.width) - 1;
+	return (struct meson_sclk_div_data *)clk->data;
 }
 
 static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk)
 {
-	return sclk_div_maxval(sclk) + 1;
+	unsigned int reg = clk_div_mask(sclk->div.width);
+
+	return get_value(reg, sclk->flags);
 }
 
 static int sclk_div_getdiv(struct clk_hw *hw, unsigned long rate,
 			   unsigned long prate, int maxdiv)
 {
 	int div = DIV_ROUND_CLOSEST_ULL((u64)prate, rate);
+	struct clk_regmap *clk = to_clk_regmap(hw);
+	struct meson_sclk_div_data *sclk = meson_sclk_div_data(clk);
+	int mindiv = get_value(1, sclk->flags);
 
-	return clamp(div, 2, maxdiv);
+	return clamp(div, mindiv, maxdiv);
 }
 
 static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate,
@@ -47,7 +65,7 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate,
 			    struct meson_sclk_div_data *sclk)
 {
 	struct clk_hw *parent = clk_hw_get_parent(hw);
-	int bestdiv = 0, i;
+	int bestdiv = 0, i, mindiv;
 	unsigned long maxdiv, now, parent_now;
 	unsigned long best = 0, best_parent = 0;
 
@@ -64,8 +82,9 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate,
 	 * unsigned long in rate * i below
 	 */
 	maxdiv = min(ULONG_MAX / rate, maxdiv);
+	mindiv = get_value(1, sclk->flags);
 
-	for (i = 2; i <= maxdiv; i++) {
+	for (i = mindiv; i <= maxdiv; i++) {
 		/*
 		 * It's the most ideal case if the requested rate can be
 		 * divided from parent clock without needing to change
@@ -111,10 +130,7 @@ static void sclk_apply_ratio(struct clk_regmap *clk,
 					    sclk->cached_duty.num,
 					    sclk->cached_duty.den);
 
-	if (hi)
-		hi -= 1;
-
-	meson_parm_write(clk->map, &sclk->hi, hi);
+	meson_parm_write(clk->map, &sclk->hi, get_reg(hi, sclk->flags));
 }
 
 static int sclk_div_set_duty_cycle(struct clk_hw *hw,
@@ -145,7 +161,7 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw,
 	}
 
 	hi = meson_parm_read(clk->map, &sclk->hi);
-	duty->num = hi + 1;
+	duty->num = get_value(hi, sclk->flags);
 	duty->den = sclk->cached_div;
 	return 0;
 }
@@ -153,10 +169,13 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw,
 static void sclk_apply_divider(struct clk_regmap *clk,
 			       struct meson_sclk_div_data *sclk)
 {
+	unsigned int div;
+
 	if (MESON_PARM_APPLICABLE(&sclk->hi))
 		sclk_apply_ratio(clk, sclk);
 
-	meson_parm_write(clk->map, &sclk->div, sclk->cached_div - 1);
+	div = get_reg(sclk->cached_div, sclk->flags);
+	meson_parm_write(clk->map, &sclk->div, div);
 }
 
 static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -224,7 +243,7 @@ static void sclk_div_init(struct clk_hw *hw)
 	if (!val)
 		sclk->cached_div = sclk_div_maxdiv(sclk);
 	else
-		sclk->cached_div = val + 1;
+		sclk->cached_div = get_value(val, sclk->flags);
 
 	sclk_div_get_duty_cycle(hw, &sclk->cached_duty);
 }
-- 
1.9.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCH v8 2/4] clk: meson: add emmc sub clock phase delay driver
  2018-12-17 16:24 [PATCH v8 0/4] clk: meson: add a sub EMMC clock controller support Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 1/4] clk: meson: add one based divider support for sclk divider Jianxin Pan
@ 2018-12-17 16:24 ` Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 3/4] clk: meson: add DT documentation for emmc clock controller Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver Jianxin Pan
  3 siblings, 0 replies; 8+ messages in thread
From: Jianxin Pan @ 2018-12-17 16:24 UTC (permalink / raw)
  To: Jerome Brunet, Neil Armstrong
  Cc: Yixun Lan, Jianxin Pan, Kevin Hilman, Carlo Caione,
	Michael Turquette, Stephen Boyd, Rob Herring, Miquel Raynal,
	Boris Brezillon, Martin Blumenstingl, Liang Yang, Jian Hu,
	Qiufang Dai, Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel

From: Yixun Lan <yixun.lan@amlogic.com>

Export the emmc sub clock phase delay ops which will be used
by the emmc sub clock driver itself.

Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
---
 drivers/clk/meson/Makefile          |  1 +
 drivers/clk/meson/clk-phase-delay.c | 70 +++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/clkc.h            |  7 ++++
 3 files changed, 78 insertions(+)
 create mode 100644 drivers/clk/meson/clk-phase-delay.c

diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index acd8694..d59620d 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -3,6 +3,7 @@
 #
 
 obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid-pll-div.o
+obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-phase-delay.o
 obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o
 obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o
 obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o
diff --git a/drivers/clk/meson/clk-phase-delay.c b/drivers/clk/meson/clk-phase-delay.c
new file mode 100644
index 0000000..88004d2
--- /dev/null
+++ b/drivers/clk/meson/clk-phase-delay.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Amlogic Meson MMC Sub Clock Controller Driver
+ *
+ * Copyright (c) 2017 Baylibre SAS.
+ * Author: Jerome Brunet <jbrunet@baylibre.com>
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Yixun Lan <yixun.lan@amlogic.com>
+ * Author: Jianxin Pan <jianxin.pan@amlogic.com>
+ */
+
+#include <linux/clk-provider.h>
+#include "clkc.h"
+
+static inline struct meson_clk_phase_delay_data *
+meson_clk_get_phase_delay_data(struct clk_regmap *clk)
+{
+	return clk->data;
+}
+
+static int meson_clk_phase_delay_get_phase(struct clk_hw *hw)
+{
+	struct clk_regmap *clk = to_clk_regmap(hw);
+	struct meson_clk_phase_delay_data *ph;
+	unsigned long period_ps, p, d;
+	int degrees;
+
+	ph = meson_clk_get_phase_delay_data(clk);
+	p = meson_parm_read(clk->map, &ph->phase);
+	degrees = p * 360 / (1 << (ph->phase.width));
+
+	period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
+				 clk_hw_get_rate(hw));
+
+	d = meson_parm_read(clk->map, &ph->delay);
+	degrees += d * ph->delay_step_ps * 360 / period_ps;
+	degrees %= 360;
+
+	return degrees;
+}
+
+static int meson_clk_phase_delay_set_phase(struct clk_hw *hw, int degrees)
+{
+	struct clk_regmap *clk = to_clk_regmap(hw);
+	struct meson_clk_phase_delay_data *ph;
+	unsigned long period_ps, d = 0, r;
+
+	ph = meson_clk_get_phase_delay_data(clk);
+	period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
+
+	/*
+	 * First compute the phase index (p), the remainder (r) is the
+	 * part we'll try to acheive using the delays (d).
+	 */
+	r = do_div(degrees, 360 / 1 << (ph->phase.width));
+	d = DIV_ROUND_CLOSEST(r * period_ps,
+			      360 * ph->delay_step_ps);
+	d = min(d, PMASK(ph->delay.width));
+
+	meson_parm_write(clk->map, &ph->phase, degrees);
+	meson_parm_write(clk->map, &ph->delay, d);
+	return 0;
+}
+
+const struct clk_ops meson_clk_phase_delay_ops = {
+	.get_phase = meson_clk_phase_delay_get_phase,
+	.set_phase = meson_clk_phase_delay_set_phase,
+};
+EXPORT_SYMBOL_GPL(meson_clk_phase_delay_ops);
diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
index 00b3320..e6f0905 100644
--- a/drivers/clk/meson/clkc.h
+++ b/drivers/clk/meson/clkc.h
@@ -118,6 +118,12 @@ struct clk_regmap _name = {						\
 	},								\
 };
 
+struct meson_clk_phase_delay_data {
+	struct parm	phase;
+	struct parm	delay;
+	unsigned int	delay_step_ps;
+};
+
 /* clk_ops */
 extern const struct clk_ops meson_clk_pll_ro_ops;
 extern const struct clk_ops meson_clk_pll_ops;
@@ -127,6 +133,7 @@ struct clk_regmap _name = {						\
 extern const struct clk_ops meson_clk_phase_ops;
 extern const struct clk_ops meson_vid_pll_div_ro_ops;
 extern const struct clk_ops meson_sclk_div_ops;
+extern const struct clk_ops meson_clk_phase_delay_ops;
 
 struct clk_hw *meson_clk_hw_register_input(struct device *dev,
 					   const char *of_name,
-- 
1.9.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCH v8 3/4] clk: meson: add DT documentation for emmc clock controller
  2018-12-17 16:24 [PATCH v8 0/4] clk: meson: add a sub EMMC clock controller support Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 1/4] clk: meson: add one based divider support for sclk divider Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 2/4] clk: meson: add emmc sub clock phase delay driver Jianxin Pan
@ 2018-12-17 16:24 ` Jianxin Pan
  2018-12-17 16:24 ` [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver Jianxin Pan
  3 siblings, 0 replies; 8+ messages in thread
From: Jianxin Pan @ 2018-12-17 16:24 UTC (permalink / raw)
  To: Jerome Brunet, Neil Armstrong
  Cc: Yixun Lan, Jianxin Pan, Kevin Hilman, Carlo Caione,
	Michael Turquette, Stephen Boyd, Rob Herring, Miquel Raynal,
	Boris Brezillon, Martin Blumenstingl, Liang Yang, Jian Hu,
	Qiufang Dai, Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel

From: Yixun Lan <yixun.lan@amlogic.com>

Document the MMC sub clock controller driver, the potential consumer
of this driver is MMC or NAND. Also add four clock bindings IDs which
provided by this driver.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
---
 .../devicetree/bindings/clock/amlogic,mmc-clkc.txt | 39 ++++++++++++++++++++++
 include/dt-bindings/clock/amlogic,mmc-clkc.h       | 17 ++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
 create mode 100644 include/dt-bindings/clock/amlogic,mmc-clkc.h

diff --git a/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
new file mode 100644
index 0000000..0f518e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
@@ -0,0 +1,39 @@
+* Amlogic MMC Sub Clock Controller Driver
+
+The Amlogic MMC clock controller generates and supplies clock to support
+MMC and NAND controller
+
+Required Properties:
+
+- compatible: should be:
+		"amlogic,gx-mmc-clkc"
+		"amlogic,axg-mmc-clkc"
+
+- #clock-cells: should be 1.
+- clocks: phandles to clocks corresponding to the clock-names property
+- clock-names: list of parent clock names
+	- "clkin0", "clkin1"
+
+- reg: address of emmc sub clock register
+
+Example: Clock controller node:
+
+sd_mmc_c_clkc: clock-controller@7000 {
+	compatible = "amlogic,axg-mmc-clkc", "syscon";
+	reg = <0x0 0x7000 0x0 0x4>;
+	#clock-cells = <1>;
+
+	clock-names = "clkin0", "clkin1";
+	clocks = <&clkc CLKID_SD_MMC_C_CLK0>,
+		 <&clkc CLKID_FCLK_DIV2>;
+};
+
+sd_emmc_b_clkc: clock-controller@5000 {
+	compatible = "amlogic,axg-mmc-clkc", "syscon";
+	reg = <0x0 0x5000 0x0 0x4>;
+
+	#clock-cells = <1>;
+	clock-names = "clkin0", "clkin1";
+	clocks = <&clkc CLKID_SD_EMMC_B_CLK0>,
+		 <&clkc CLKID_FCLK_DIV2>;
+};
diff --git a/include/dt-bindings/clock/amlogic,mmc-clkc.h b/include/dt-bindings/clock/amlogic,mmc-clkc.h
new file mode 100644
index 0000000..34a3c56
--- /dev/null
+++ b/include/dt-bindings/clock/amlogic,mmc-clkc.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Meson MMC sub clock tree IDs
+ *
+ * Copyright (c) 2018 Amlogic, Inc. All rights reserved.
+ * Author: Yixun Lan <yixun.lan@amlogic.com>
+ */
+
+#ifndef __MMC_CLKC_H
+#define __MMC_CLKC_H
+
+#define CLKID_MMC_DIV		0
+#define CLKID_MMC_PHASE_CORE	1
+#define CLKID_MMC_PHASE_TX	2
+#define CLKID_MMC_PHASE_RX	3
+
+#endif
-- 
1.9.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver
  2018-12-17 16:24 [PATCH v8 0/4] clk: meson: add a sub EMMC clock controller support Jianxin Pan
                   ` (2 preceding siblings ...)
  2018-12-17 16:24 ` [PATCH v8 3/4] clk: meson: add DT documentation for emmc clock controller Jianxin Pan
@ 2018-12-17 16:24 ` Jianxin Pan
  2018-12-17 20:33   ` kbuild test robot
  2019-01-09 20:48   ` Stephen Boyd
  3 siblings, 2 replies; 8+ messages in thread
From: Jianxin Pan @ 2018-12-17 16:24 UTC (permalink / raw)
  To: Jerome Brunet, Neil Armstrong
  Cc: Yixun Lan, Jianxin Pan, Kevin Hilman, Carlo Caione,
	Michael Turquette, Stephen Boyd, Rob Herring, Miquel Raynal,
	Boris Brezillon, Martin Blumenstingl, Liang Yang, Jian Hu,
	Qiufang Dai, Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel

From: Yixun Lan <yixun.lan@amlogic.com>

The patch will add a MMC clock controller driver which used by MMC or NAND,
It provide a mux and divider clock, and three phase clocks - core, tx, tx.

Two clocks are provided as the parent of MMC clock controller from
upper layer clock controller - eg "amlogic,axg-clkc" in AXG platform.

To specify which clock the MMC or NAND driver may consume,
the preprocessor macros in the dt-bindings/clock/amlogic,mmc-clkc.h header
can be used in the device tree sources.

Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
---
 drivers/clk/meson/Kconfig    |   9 ++
 drivers/clk/meson/Makefile   |   1 +
 drivers/clk/meson/mmc-clkc.c | 304 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 314 insertions(+)
 create mode 100644 drivers/clk/meson/mmc-clkc.c

diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
index efaa70f..c84b0f7 100644
--- a/drivers/clk/meson/Kconfig
+++ b/drivers/clk/meson/Kconfig
@@ -15,6 +15,15 @@ config COMMON_CLK_MESON_AO
 	select COMMON_CLK_REGMAP_MESON
 	select RESET_CONTROLLER
 
+config COMMON_CLK_MMC_MESON
+	tristate "Meson MMC Sub Clock Controller Driver"
+	select MFD_SYSCON
+	select COMMON_CLK_AMLOGIC
+	help
+	  Support for the MMC sub clock controller on Amlogic Meson Platform,
+	  which include S905 (GXBB, GXL), A113D/X (AXG) devices.
+	  Say Y if you want this clock enabled.
+
 config COMMON_CLK_REGMAP_MESON
 	bool
 	select REGMAP
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index d59620d..54416a2 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -12,4 +12,5 @@ obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o
 obj-$(CONFIG_COMMON_CLK_GXBB)	 += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o
 obj-$(CONFIG_COMMON_CLK_AXG)	 += axg.o axg-aoclk.o
 obj-$(CONFIG_COMMON_CLK_AXG_AUDIO)	+= axg-audio.o
+obj-$(CONFIG_COMMON_CLK_MMC_MESON) 	+= mmc-clkc.o
 obj-$(CONFIG_COMMON_CLK_REGMAP_MESON)	+= clk-regmap.o
diff --git a/drivers/clk/meson/mmc-clkc.c b/drivers/clk/meson/mmc-clkc.c
new file mode 100644
index 0000000..2582a98
--- /dev/null
+++ b/drivers/clk/meson/mmc-clkc.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Amlogic Meson MMC Sub Clock Controller Driver
+ *
+ * Copyright (c) 2017 Baylibre SAS.
+ * Author: Jerome Brunet <jbrunet@baylibre.com>
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Yixun Lan <yixun.lan@amlogic.com>
+ * Author: Jianxin Pan <jianxin.pan@amlogic.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/of_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/clock/amlogic,mmc-clkc.h>
+
+#include "clkc.h"
+
+/* clock ID used by internal driver */
+
+#define SD_EMMC_CLOCK		0
+#define CLK_DELAY_STEP_PS	200
+#define MUX_CLK_NUM_PARENTS	2
+#define MMC_MAX_CLKS		4
+
+struct mmc_clkc_data {
+	struct meson_clk_phase_delay_data tx;
+	struct meson_clk_phase_delay_data rx;
+};
+
+static struct clk_regmap_mux_data mmc_clkc_mux_data = {
+	.offset = SD_EMMC_CLOCK,
+	.mask   = 0x3,
+	.shift  = 6,
+};
+
+static const struct meson_sclk_div_data mmc_clkc_div_data = {
+	.div = {
+		.reg_off = SD_EMMC_CLOCK,
+		.width   = 6,
+	},
+	.flags = CLK_DIVIDER_ONE_BASED,
+};
+
+static struct meson_clk_phase_data mmc_clkc_core_phase = {
+	.ph = {
+		.reg_off = SD_EMMC_CLOCK,
+		.shift   = 8,
+		.width   = 2,
+	}
+};
+
+static const struct mmc_clkc_data mmc_clkc_gx_data = {
+	.tx = {
+		.phase = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 10,
+			.width   = 2,
+		},
+		.delay = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 16,
+			.width   = 4,
+		},
+		.delay_step_ps = CLK_DELAY_STEP_PS,
+	},
+	.rx = {
+		.phase = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 12,
+			.width   = 2,
+		},
+		.delay = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 20,
+			.width   = 4,
+		},
+		.delay_step_ps   = CLK_DELAY_STEP_PS,
+	},
+};
+
+static const struct mmc_clkc_data mmc_clkc_axg_data = {
+	.tx = {
+		.phase = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 10,
+			.width   = 2,
+		},
+		.delay = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 16,
+			.width   = 6,
+		},
+		.delay_step_ps   = CLK_DELAY_STEP_PS,
+	},
+	.rx = {
+		.phase = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 12,
+			.width   = 2,
+		},
+		.delay = {
+			.reg_off = SD_EMMC_CLOCK,
+			.shift   = 22,
+			.width   = 6,
+		},
+		.delay_step_ps   = CLK_DELAY_STEP_PS,
+	},
+};
+
+static const struct of_device_id mmc_clkc_match_table[] = {
+	{
+		.compatible	= "amlogic,gx-mmc-clkc",
+		.data		= &mmc_clkc_gx_data
+	},
+	{
+		.compatible	= "amlogic,axg-mmc-clkc",
+		.data		= &mmc_clkc_axg_data
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(of, mmc_clkc_match_table);
+
+static struct clk_regmap *
+mmc_clkc_register_clk(struct device *dev, struct regmap *map,
+		      struct clk_init_data *init,
+		      const char *suffix, void *data)
+{
+	struct clk_regmap *clk;
+	char *name;
+	int ret;
+
+	clk = devm_kzalloc(dev, sizeof(*clk), GFP_KERNEL);
+	if (!clk)
+		return ERR_PTR(-ENOMEM);
+
+	name = kasprintf(GFP_KERNEL, "%s#%s", dev_name(dev), suffix);
+	if (!name)
+		return ERR_PTR(-ENOMEM);
+
+	init->name = name;
+	clk->map = map;
+	clk->data = data;
+	clk->hw.init = init;
+	ret = devm_clk_hw_register(dev, &clk->hw);
+	if (ret)
+		clk = ERR_PTR(ret);
+
+	kfree(name);
+	return clk;
+}
+
+static struct clk_regmap *mmc_clkc_register_mux(struct device *dev,
+						struct regmap *map)
+{
+	const char *parent_names[MUX_CLK_NUM_PARENTS];
+	struct clk_init_data init;
+	struct clk_regmap *mux;
+	struct clk *clk;
+	int i;
+
+	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		char name[8];
+
+		snprintf(name, sizeof(name), "clkin%d", i);
+		clk = devm_clk_get(dev, name);
+		if (IS_ERR(clk)) {
+			if (clk != ERR_PTR(-EPROBE_DEFER))
+				dev_err(dev, "Missing clock %s\n", name);
+			return ERR_CAST(clk);
+		}
+
+		parent_names[i] = __clk_get_name(clk);
+	}
+
+	init.ops = &clk_regmap_mux_ops;
+	init.flags = CLK_SET_RATE_PARENT;
+	init.parent_names = parent_names;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
+
+	mux = mmc_clkc_register_clk(dev, map, &init, "mux", &mmc_clkc_mux_data);
+	if (IS_ERR(mux))
+		dev_err(dev, "Mux clock registration failed\n");
+
+	return mux;
+}
+
+static struct clk_regmap *
+mmc_clkc_register_clk_with_parent(struct device *dev, struct regmap *map,
+				  char *suffix, const struct clk_hw *hw,
+				  unsigned long flags,
+				  const struct clk_ops *ops, void *data)
+{
+	struct clk_init_data init;
+	struct clk_regmap *clk;
+	const char *parent_name = clk_hw_get_name(hw);
+
+	init.ops = ops;
+	init.flags = flags;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	clk = mmc_clkc_register_clk(dev, map, &init, suffix, data);
+	if (IS_ERR(clk))
+		dev_err(dev, "%s clock registration failed\n", suffix);
+
+	return clk;
+}
+
+static int mmc_clkc_probe(struct platform_device *pdev)
+{
+	struct clk_hw_onecell_data *onecell_data;
+	struct device *dev = &pdev->dev;
+	struct mmc_clkc_data *data;
+	struct regmap *map;
+	struct clk_regmap *clk, *core;
+	struct meson_sclk_div_data *div_data;
+
+	/*cast to drop the const in match->data*/
+	data = (struct mmc_clkc_data *)of_device_get_match_data(dev);
+	if (!data)
+		return -ENODEV;
+
+	map = syscon_node_to_regmap(dev->of_node);
+	if (IS_ERR(map)) {
+		dev_err(dev, "could not find mmc clock controller\n");
+		return PTR_ERR(map);
+	}
+
+	onecell_data = devm_kzalloc(dev, sizeof(*onecell_data) +
+				    sizeof(*onecell_data->hws) * MMC_MAX_CLKS,
+				    GFP_KERNEL);
+	if (!onecell_data)
+		return -ENOMEM;
+
+	clk = mmc_clkc_register_mux(dev, map);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	div_data = devm_kzalloc(dev, sizeof(*div_data), GFP_KERNEL);
+	if (!div_data)
+		return -ENOMEM;
+
+	memcpy(div_data, &mmc_clkc_div_data, sizeof(*div_data));
+	clk = mmc_clkc_register_clk_with_parent(dev, map, "div",
+						&clk->hw,
+						CLK_SET_RATE_PARENT,
+						&meson_sclk_div_ops,
+						div_data);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	onecell_data->hws[CLKID_MMC_DIV] = &clk->hw,
+
+	core = mmc_clkc_register_clk_with_parent(dev, map, "core",
+						 &clk->hw,
+						 CLK_SET_RATE_PARENT,
+						 &meson_clk_phase_ops,
+						 &mmc_clkc_core_phase);
+	if (IS_ERR(core))
+		return PTR_ERR(core);
+
+	onecell_data->hws[CLKID_MMC_PHASE_CORE] = &core->hw,
+
+	clk = mmc_clkc_register_clk_with_parent(dev, map, "rx",
+						&core->hw,  0,
+						&meson_clk_phase_delay_ops,
+						&data->rx);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	onecell_data->hws[CLKID_MMC_PHASE_RX] = &clk->hw,
+	clk = mmc_clkc_register_clk_with_parent(dev, map, "tx",
+						&core->hw,  0,
+						&meson_clk_phase_delay_ops,
+						&data->tx);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	onecell_data->hws[CLKID_MMC_PHASE_TX] = &clk->hw,
+	onecell_data->num = MMC_MAX_CLKS;
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+					   onecell_data);
+}
+
+static struct platform_driver mmc_clkc_driver = {
+	.probe		= mmc_clkc_probe,
+	.driver		= {
+		.name	= "meson-mmc-clkc",
+		.of_match_table = of_match_ptr(mmc_clkc_match_table),
+	},
+};
+
+module_platform_driver(mmc_clkc_driver);
+
+MODULE_DESCRIPTION("Amlogic AXG MMC clock driver");
+MODULE_AUTHOR("Jianxin Pan <jianxin.pan@amlogic.com>");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver
  2018-12-17 16:24 ` [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver Jianxin Pan
@ 2018-12-17 20:33   ` kbuild test robot
  2019-01-09 20:48   ` Stephen Boyd
  1 sibling, 0 replies; 8+ messages in thread
From: kbuild test robot @ 2018-12-17 20:33 UTC (permalink / raw)
  To: Jianxin Pan
  Cc: kbuild-all, Jerome Brunet, Neil Armstrong, Yixun Lan,
	Jianxin Pan, Kevin Hilman, Carlo Caione, Michael Turquette,
	Stephen Boyd, Rob Herring, Miquel Raynal, Boris Brezillon,
	Martin Blumenstingl, Liang Yang, Jian Hu, Qiufang Dai,
	Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel

[-- Attachment #1: Type: text/plain, Size: 12251 bytes --]

Hi Yixun,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on clk/clk-next]
[also build test ERROR on next-20181217]
[cannot apply to v4.20-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jianxin-Pan/clk-meson-add-one-based-divider-support-for-sclk-divider/20181218-021139
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sh 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/cache.h:5:0,
                    from include/linux/printk.h:9,
                    from include/linux/kernel.h:14,
                    from include/asm-generic/bug.h:18,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/io.h:23,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk//meson/clk-phase-delay.c:13:
   drivers/clk//meson/clk-phase-delay.c: In function 'meson_clk_phase_delay_get_phase':
>> drivers/clk//meson/clk-phase-delay.c:33:40: warning: integer overflow in expression [-Woverflow]
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
                                           ^
   include/uapi/linux/kernel.h:13:40: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
    #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
                                           ^
>> drivers/clk//meson/clk-phase-delay.c:33:14: note: in expansion of macro 'DIV_ROUND_UP'
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
                 ^~~~~~~~~~~~
   drivers/clk//meson/clk-phase-delay.c: In function 'meson_clk_phase_delay_set_phase':
   drivers/clk//meson/clk-phase-delay.c:50:40: warning: integer overflow in expression [-Woverflow]
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
                                           ^
   include/uapi/linux/kernel.h:13:40: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
    #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
                                           ^
   drivers/clk//meson/clk-phase-delay.c:50:14: note: in expansion of macro 'DIV_ROUND_UP'
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
                 ^~~~~~~~~~~~
   In file included from ./arch/sh/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:207,
                    from include/asm-generic/bug.h:18,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/io.h:23,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk//meson/clk-phase-delay.c:13:
   include/asm-generic/div64.h:222:28: warning: comparison of distinct pointer types lacks a cast
     (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
                               ^
>> drivers/clk//meson/clk-phase-delay.c:56:6: note: in expansion of macro 'do_div'
     r = do_div(degrees, 360 / 1 << (ph->phase.width));
         ^~~~~~
   In file included from include/linux/init.h:5:0,
                    from include/linux/io.h:22,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk//meson/clk-phase-delay.c:13:
   include/asm-generic/div64.h:235:25: warning: right shift count >= width of type [-Wshift-count-overflow]
     } else if (likely(((n) >> 32) == 0)) {  \
                            ^
   include/linux/compiler.h:76:40: note: in definition of macro 'likely'
    # define likely(x) __builtin_expect(!!(x), 1)
                                           ^
>> drivers/clk//meson/clk-phase-delay.c:56:6: note: in expansion of macro 'do_div'
     r = do_div(degrees, 360 / 1 << (ph->phase.width));
         ^~~~~~
   In file included from ./arch/sh/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:207,
                    from include/asm-generic/bug.h:18,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/io.h:23,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk//meson/clk-phase-delay.c:13:
>> include/asm-generic/div64.h:239:22: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
      __rem = __div64_32(&(n), __base); \
                         ^
>> drivers/clk//meson/clk-phase-delay.c:56:6: note: in expansion of macro 'do_div'
     r = do_div(degrees, 360 / 1 << (ph->phase.width));
         ^~~~~~
   include/asm-generic/div64.h:213:17: note: expected 'uint64_t * {aka long long unsigned int *}' but argument is of type 'int *'
    extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
                    ^~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/cache.h:5:0,
                    from include/linux/printk.h:9,
                    from include/linux/kernel.h:14,
                    from include/asm-generic/bug.h:18,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/io.h:23,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk/meson/clk-phase-delay.c:13:
   drivers/clk/meson/clk-phase-delay.c: In function 'meson_clk_phase_delay_get_phase':
   drivers/clk/meson/clk-phase-delay.c:33:40: warning: integer overflow in expression [-Woverflow]
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
                                           ^
   include/uapi/linux/kernel.h:13:40: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
    #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
                                           ^
   drivers/clk/meson/clk-phase-delay.c:33:14: note: in expansion of macro 'DIV_ROUND_UP'
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
                 ^~~~~~~~~~~~
   drivers/clk/meson/clk-phase-delay.c: In function 'meson_clk_phase_delay_set_phase':
   drivers/clk/meson/clk-phase-delay.c:50:40: warning: integer overflow in expression [-Woverflow]
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
                                           ^
   include/uapi/linux/kernel.h:13:40: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
    #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
                                           ^
   drivers/clk/meson/clk-phase-delay.c:50:14: note: in expansion of macro 'DIV_ROUND_UP'
     period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
                 ^~~~~~~~~~~~
   In file included from ./arch/sh/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:207,
                    from include/asm-generic/bug.h:18,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/io.h:23,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk/meson/clk-phase-delay.c:13:
   include/asm-generic/div64.h:222:28: warning: comparison of distinct pointer types lacks a cast
     (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
                               ^
   drivers/clk/meson/clk-phase-delay.c:56:6: note: in expansion of macro 'do_div'
     r = do_div(degrees, 360 / 1 << (ph->phase.width));
         ^~~~~~
   In file included from include/linux/init.h:5:0,
                    from include/linux/io.h:22,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk/meson/clk-phase-delay.c:13:
   include/asm-generic/div64.h:235:25: warning: right shift count >= width of type [-Wshift-count-overflow]
     } else if (likely(((n) >> 32) == 0)) {  \
                            ^
   include/linux/compiler.h:76:40: note: in definition of macro 'likely'
    # define likely(x) __builtin_expect(!!(x), 1)
                                           ^
   drivers/clk/meson/clk-phase-delay.c:56:6: note: in expansion of macro 'do_div'
     r = do_div(degrees, 360 / 1 << (ph->phase.width));
         ^~~~~~
   In file included from ./arch/sh/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:207,
                    from include/asm-generic/bug.h:18,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/io.h:23,
                    from include/linux/clk-provider.h:9,
                    from drivers/clk/meson/clk-phase-delay.c:13:
>> include/asm-generic/div64.h:239:22: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
      __rem = __div64_32(&(n), __base); \
                         ^
   drivers/clk/meson/clk-phase-delay.c:56:6: note: in expansion of macro 'do_div'
     r = do_div(degrees, 360 / 1 << (ph->phase.width));
         ^~~~~~
   include/asm-generic/div64.h:213:17: note: expected 'uint64_t * {aka long long unsigned int *}' but argument is of type 'int *'
    extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
                    ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/__div64_32 +239 include/asm-generic/div64.h

^1da177e Linus Torvalds 2005-04-16  215  
^1da177e Linus Torvalds 2005-04-16  216  /* The unnecessary pointer compare is there
^1da177e Linus Torvalds 2005-04-16  217   * to check for type safety (n must be 64bit)
^1da177e Linus Torvalds 2005-04-16  218   */
^1da177e Linus Torvalds 2005-04-16  219  # define do_div(n,base) ({				\
^1da177e Linus Torvalds 2005-04-16  220  	uint32_t __base = (base);			\
^1da177e Linus Torvalds 2005-04-16  221  	uint32_t __rem;					\
^1da177e Linus Torvalds 2005-04-16  222  	(void)(((typeof((n)) *)0) == ((uint64_t *)0));	\
911918aa Nicolas Pitre  2015-11-02  223  	if (__builtin_constant_p(__base) &&		\
911918aa Nicolas Pitre  2015-11-02  224  	    is_power_of_2(__base)) {			\
911918aa Nicolas Pitre  2015-11-02  225  		__rem = (n) & (__base - 1);		\
911918aa Nicolas Pitre  2015-11-02  226  		(n) >>= ilog2(__base);			\
461a5e51 Nicolas Pitre  2015-10-30  227  	} else if (__div64_const32_is_OK &&		\
461a5e51 Nicolas Pitre  2015-10-30  228  		   __builtin_constant_p(__base) &&	\
461a5e51 Nicolas Pitre  2015-10-30  229  		   __base != 0) {			\
461a5e51 Nicolas Pitre  2015-10-30  230  		uint32_t __res_lo, __n_lo = (n);	\
461a5e51 Nicolas Pitre  2015-10-30  231  		(n) = __div64_const32(n, __base);	\
461a5e51 Nicolas Pitre  2015-10-30  232  		/* the remainder can be computed with 32-bit regs */ \
461a5e51 Nicolas Pitre  2015-10-30  233  		__res_lo = (n);				\
461a5e51 Nicolas Pitre  2015-10-30  234  		__rem = __n_lo - __res_lo * __base;	\
911918aa Nicolas Pitre  2015-11-02  235  	} else if (likely(((n) >> 32) == 0)) {		\
^1da177e Linus Torvalds 2005-04-16  236  		__rem = (uint32_t)(n) % __base;		\
^1da177e Linus Torvalds 2005-04-16  237  		(n) = (uint32_t)(n) / __base;		\
^1da177e Linus Torvalds 2005-04-16  238  	} else 						\
^1da177e Linus Torvalds 2005-04-16 @239  		__rem = __div64_32(&(n), __base);	\
^1da177e Linus Torvalds 2005-04-16  240  	__rem;						\
^1da177e Linus Torvalds 2005-04-16  241   })
^1da177e Linus Torvalds 2005-04-16  242  

:::::: The code at line 239 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 50461 bytes --]

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver
  2018-12-17 16:24 ` [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver Jianxin Pan
  2018-12-17 20:33   ` kbuild test robot
@ 2019-01-09 20:48   ` Stephen Boyd
  2019-01-15 16:29     ` Jianxin Pan
  1 sibling, 1 reply; 8+ messages in thread
From: Stephen Boyd @ 2019-01-09 20:48 UTC (permalink / raw)
  To: Jerome Brunet, Jianxin Pan, Neil Armstrong
  Cc: Yixun Lan, Jianxin Pan, Kevin Hilman, Carlo Caione,
	Michael Turquette, Rob Herring, Miquel Raynal, Boris Brezillon,
	Martin Blumenstingl, Liang Yang, Jian Hu, Qiufang Dai,
	Hanjie Lin, Victor Wan, linux-clk, linux-amlogic,
	linux-arm-kernel, linux-kernel

Quoting Jianxin Pan (2018-12-17 08:24:10)
> diff --git a/drivers/clk/meson/mmc-clkc.c b/drivers/clk/meson/mmc-clkc.c
> new file mode 100644
> index 0000000..2582a98
> --- /dev/null
> +++ b/drivers/clk/meson/mmc-clkc.c
> @@ -0,0 +1,304 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Amlogic Meson MMC Sub Clock Controller Driver
> + *
> + * Copyright (c) 2017 Baylibre SAS.
> + * Author: Jerome Brunet <jbrunet@baylibre.com>
> + *
> + * Copyright (c) 2018 Amlogic, inc.
> + * Author: Yixun Lan <yixun.lan@amlogic.com>
> + * Author: Jianxin Pan <jianxin.pan@amlogic.com>
> + */
> +
> +#include <linux/clk.h>

Do you need this include?

> +#include <linux/clk-provider.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/of_device.h>
> +#include <linux/mfd/syscon.h>

Is this used?

> +#include <linux/platform_device.h>
[...]
> +       init.num_parents = 1;
> +
> +       clk = mmc_clkc_register_clk(dev, map, &init, suffix, data);
> +       if (IS_ERR(clk))
> +               dev_err(dev, "%s clock registration failed\n", suffix);
> +
> +       return clk;
> +}
> +
> +static int mmc_clkc_probe(struct platform_device *pdev)
> +{
> +       struct clk_hw_onecell_data *onecell_data;
> +       struct device *dev = &pdev->dev;
> +       struct mmc_clkc_data *data;
> +       struct regmap *map;
> +       struct clk_regmap *clk, *core;
> +       struct meson_sclk_div_data *div_data;
> +
> +       /*cast to drop the const in match->data*/
> +       data = (struct mmc_clkc_data *)of_device_get_match_data(dev);

Is that necessary? Maybe the users of this should take a const argument
and copy things?

> +       if (!data)
> +               return -ENODEV;
> +
> +       map = syscon_node_to_regmap(dev->of_node);
> +       if (IS_ERR(map)) {
> +               dev_err(dev, "could not find mmc clock controller\n");
> +               return PTR_ERR(map);
> +       }
> +
> +       onecell_data = devm_kzalloc(dev, sizeof(*onecell_data) +
> +                                   sizeof(*onecell_data->hws) * MMC_MAX_CLKS,

struct_size()?

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver
  2019-01-09 20:48   ` Stephen Boyd
@ 2019-01-15 16:29     ` Jianxin Pan
  0 siblings, 0 replies; 8+ messages in thread
From: Jianxin Pan @ 2019-01-15 16:29 UTC (permalink / raw)
  To: Stephen Boyd, Jerome Brunet, Neil Armstrong
  Cc: Yixun Lan, Kevin Hilman, Carlo Caione, Michael Turquette,
	Rob Herring, Miquel Raynal, Boris Brezillon, Martin Blumenstingl,
	Liang Yang, Jian Hu, Qiufang Dai, Hanjie Lin, Victor Wan,
	linux-clk, linux-amlogic, linux-arm-kernel, linux-kernel

Hi Stephen,

Thank you for your time.
Please see my comments below.

On 2019/1/10 4:48, Stephen Boyd wrote:
> Quoting Jianxin Pan (2018-12-17 08:24:10)
>> diff --git a/drivers/clk/meson/mmc-clkc.c b/drivers/clk/meson/mmc-clkc.c
>> new file mode 100644
>> index 0000000..2582a98
>> --- /dev/null
>> +++ b/drivers/clk/meson/mmc-clkc.c
>> @@ -0,0 +1,304 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Amlogic Meson MMC Sub Clock Controller Driver
>> + *
>> + * Copyright (c) 2017 Baylibre SAS.
>> + * Author: Jerome Brunet <jbrunet@baylibre.com>
>> + *
>> + * Copyright (c) 2018 Amlogic, inc.
>> + * Author: Yixun Lan <yixun.lan@amlogic.com>
>> + * Author: Jianxin Pan <jianxin.pan@amlogic.com>
>> + */
>> +
>> +#include <linux/clk.h>
> 
> Do you need this include?
> 
Yes, It's also a clock-consumer. 
devm_clk_get() gets clock from dts as the parent of mux.
Thank you for your review.
>> +#include <linux/clk-provider.h>
>> +#include <linux/module.h>
>> +#include <linux/regmap.h>
>> +#include <linux/slab.h>
>> +#include <linux/of_device.h>
>> +#include <linux/mfd/syscon.h>
> 
> Is this used?
Yes, syscon_node_to_regmap() is used in mmc_clkc_probe().
> 
>> +#include <linux/platform_device.h>
> [...]
>> +       init.num_parents = 1;
>> +
>> +       clk = mmc_clkc_register_clk(dev, map, &init, suffix, data);
>> +       if (IS_ERR(clk))
>> +               dev_err(dev, "%s clock registration failed\n", suffix);
>> +
>> +       return clk;
>> +}
>> +
>> +static int mmc_clkc_probe(struct platform_device *pdev)
>> +{
>> +       struct clk_hw_onecell_data *onecell_data;
>> +       struct device *dev = &pdev->dev;
>> +       struct mmc_clkc_data *data;
>> +       struct regmap *map;
>> +       struct clk_regmap *clk, *core;
>> +       struct meson_sclk_div_data *div_data;
>> +
>> +       /*cast to drop the const in match->data*/
>> +       data = (struct mmc_clkc_data *)of_device_get_match_data(dev);
> 
> Is that necessary? Maybe the users of this should take a const argument
> and copy things?
OK, I can alloc two extra memory for PHASE_RX and PHASE_TX data, and then copy from const data to them.
> 
>> +       if (!data)
>> +               return -ENODEV;
>> +
>> +       map = syscon_node_to_regmap(dev->of_node);
>> +       if (IS_ERR(map)) {
>> +               dev_err(dev, "could not find mmc clock controller\n");
>> +               return PTR_ERR(map);
>> +       }
>> +
>> +       onecell_data = devm_kzalloc(dev, sizeof(*onecell_data) +
>> +                                   sizeof(*onecell_data->hws) * MMC_MAX_CLKS,
> 
> struct_size()?
> 
OK, I will change it in the next version.
Thank you for your review.
> .
> 


^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, back to index

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-12-17 16:24 [PATCH v8 0/4] clk: meson: add a sub EMMC clock controller support Jianxin Pan
2018-12-17 16:24 ` [PATCH v8 1/4] clk: meson: add one based divider support for sclk divider Jianxin Pan
2018-12-17 16:24 ` [PATCH v8 2/4] clk: meson: add emmc sub clock phase delay driver Jianxin Pan
2018-12-17 16:24 ` [PATCH v8 3/4] clk: meson: add DT documentation for emmc clock controller Jianxin Pan
2018-12-17 16:24 ` [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver Jianxin Pan
2018-12-17 20:33   ` kbuild test robot
2019-01-09 20:48   ` Stephen Boyd
2019-01-15 16:29     ` Jianxin Pan

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