generic: backport regmap reg_base and downshift features

Backport new regmap features from Linux 5.18 which are needed to let
mt7530 use pcs-mtk-lynxi.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

4 files changed, 243 insertions, 1 deletions

diff --git a/target/linux/generic/backport-5.15/350-v5.18-regmap-add-configurable-downshift-for-addresses.patch b/target/linux/generic/backport-5.15/350-v5.18-regmap-add-configurable-downshift-for-addresses.patch
new file mode 100644
index 0000000000..99cd89ea00
--- /dev/null
+++ b/target/linux/generic/backport-5.15/350-v5.18-regmap-add-configurable-downshift-for-addresses.patch
@@ -0,0 +1,90 @@
+From 86fc59ef818beb0e1945d17f8e734898baba7e4e Mon Sep 17 00:00:00 2001
+From: Colin Foster <colin.foster@in-advantage.com>
+Date: Sun, 13 Mar 2022 15:45:23 -0700
+Subject: [PATCH 1/2] regmap: add configurable downshift for addresses
+
+Add an additional reg_downshift to be applied to register addresses before
+any register accesses. An example of a device that uses this is a VSC7514
+chip, which require each register address to be downshifted by two if the
+access is performed over a SPI bus.
+
+Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
+Link: https://lore.kernel.org/r/20220313224524.399947-2-colin.foster@in-advantage.com
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ drivers/base/regmap/internal.h | 1 +
+ drivers/base/regmap/regmap.c   | 5 +++++
+ include/linux/regmap.h         | 3 +++
+ 3 files changed, 9 insertions(+)
+
+--- a/drivers/base/regmap/internal.h
++++ b/drivers/base/regmap/internal.h
+@@ -31,6 +31,7 @@ struct regmap_format {
+ 	size_t buf_size;
+ 	size_t reg_bytes;
+ 	size_t pad_bytes;
++	size_t reg_downshift;
+ 	size_t val_bytes;
+ 	void (*format_write)(struct regmap *map,
+ 			     unsigned int reg, unsigned int val);
+--- a/drivers/base/regmap/regmap.c
++++ b/drivers/base/regmap/regmap.c
+@@ -823,6 +823,7 @@ struct regmap *__regmap_init(struct devi
+ 
+ 	map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
+ 	map->format.pad_bytes = config->pad_bits / 8;
++	map->format.reg_downshift = config->reg_downshift;
+ 	map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
+ 	map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
+ 			config->val_bits + config->pad_bits, 8);
+@@ -1735,6 +1736,7 @@ static int _regmap_raw_write_impl(struct
+ 			return ret;
+ 	}
+ 
++	reg >>= map->format.reg_downshift;
+ 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
+ 	regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
+ 				      map->write_flag_mask);
+@@ -1905,6 +1907,7 @@ static int _regmap_bus_formatted_write(v
+ 			return ret;
+ 	}
+ 
++	reg >>= map->format.reg_downshift;
+ 	map->format.format_write(map, reg, val);
+ 
+ 	trace_regmap_hw_write_start(map, reg, 1);
+@@ -2346,6 +2349,7 @@ static int _regmap_raw_multi_reg_write(s
+ 		unsigned int reg = regs[i].reg;
+ 		unsigned int val = regs[i].def;
+ 		trace_regmap_hw_write_start(map, reg, 1);
++		reg >>= map->format.reg_downshift;
+ 		map->format.format_reg(u8, reg, map->reg_shift);
+ 		u8 += reg_bytes + pad_bytes;
+ 		map->format.format_val(u8, val, 0);
+@@ -2673,6 +2677,7 @@ static int _regmap_raw_read(struct regma
+ 			return ret;
+ 	}
+ 
++	reg >>= map->format.reg_downshift;
+ 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
+ 	regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
+ 				      map->read_flag_mask);
+--- a/include/linux/regmap.h
++++ b/include/linux/regmap.h
+@@ -237,6 +237,8 @@ typedef void (*regmap_unlock)(void *);
+  * @reg_stride: The register address stride. Valid register addresses are a
+  *              multiple of this value. If set to 0, a value of 1 will be
+  *              used.
++ * @reg_downshift: The number of bits to downshift the register before
++ *		   performing any operations.
+  * @pad_bits: Number of bits of padding between register and value.
+  * @val_bits: Number of bits in a register value, mandatory.
+  *
+@@ -360,6 +362,7 @@ struct regmap_config {
+ 
+ 	int reg_bits;
+ 	int reg_stride;
++	int reg_downshift;
+ 	int pad_bits;
+ 	int val_bits;
+ 
diff --git a/target/linux/generic/backport-5.15/351-v5.18-regmap-allow-a-defined-reg_base-to-be-added-to-every.patch b/target/linux/generic/backport-5.15/351-v5.18-regmap-allow-a-defined-reg_base-to-be-added-to-every.patch
new file mode 100644
index 0000000000..0f32288fca
--- /dev/null
+++ b/target/linux/generic/backport-5.15/351-v5.18-regmap-allow-a-defined-reg_base-to-be-added-to-every.patch
@@ -0,0 +1,95 @@
+From 0074f3f2b1e43d3cedd97e47fb6980db6d2ba79e Mon Sep 17 00:00:00 2001
+From: Colin Foster <colin.foster@in-advantage.com>
+Date: Sun, 13 Mar 2022 15:45:24 -0700
+Subject: [PATCH 2/2] regmap: allow a defined reg_base to be added to every
+ address
+
+There's an inconsistency that arises when a register set can be accessed
+internally via MMIO, or externally via SPI. The VSC7514 chip allows both
+modes of operation. When internally accessed, the system utilizes __iomem,
+devm_ioremap_resource, and devm_regmap_init_mmio.
+
+For SPI it isn't possible to utilize memory-mapped IO. To properly operate,
+the resource base must be added to the register before every operation.
+
+Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
+Link: https://lore.kernel.org/r/20220313224524.399947-3-colin.foster@in-advantage.com
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ drivers/base/regmap/internal.h | 1 +
+ drivers/base/regmap/regmap.c   | 6 ++++++
+ include/linux/regmap.h         | 3 +++
+ 3 files changed, 10 insertions(+)
+
+--- a/drivers/base/regmap/internal.h
++++ b/drivers/base/regmap/internal.h
+@@ -63,6 +63,7 @@ struct regmap {
+ 	regmap_unlock unlock;
+ 	void *lock_arg; /* This is passed to lock/unlock functions */
+ 	gfp_t alloc_flags;
++	unsigned int reg_base;
+ 
+ 	struct device *dev; /* Device we do I/O on */
+ 	void *work_buf;     /* Scratch buffer used to format I/O */
+--- a/drivers/base/regmap/regmap.c
++++ b/drivers/base/regmap/regmap.c
+@@ -821,6 +821,8 @@ struct regmap *__regmap_init(struct devi
+ 	else
+ 		map->alloc_flags = GFP_KERNEL;
+ 
++	map->reg_base = config->reg_base;
++
+ 	map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
+ 	map->format.pad_bytes = config->pad_bits / 8;
+ 	map->format.reg_downshift = config->reg_downshift;
+@@ -1736,6 +1738,7 @@ static int _regmap_raw_write_impl(struct
+ 			return ret;
+ 	}
+ 
++	reg += map->reg_base;
+ 	reg >>= map->format.reg_downshift;
+ 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
+ 	regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
+@@ -1907,6 +1910,7 @@ static int _regmap_bus_formatted_write(v
+ 			return ret;
+ 	}
+ 
++	reg += map->reg_base;
+ 	reg >>= map->format.reg_downshift;
+ 	map->format.format_write(map, reg, val);
+ 
+@@ -2349,6 +2353,7 @@ static int _regmap_raw_multi_reg_write(s
+ 		unsigned int reg = regs[i].reg;
+ 		unsigned int val = regs[i].def;
+ 		trace_regmap_hw_write_start(map, reg, 1);
++		reg += map->reg_base;
+ 		reg >>= map->format.reg_downshift;
+ 		map->format.format_reg(u8, reg, map->reg_shift);
+ 		u8 += reg_bytes + pad_bytes;
+@@ -2677,6 +2682,7 @@ static int _regmap_raw_read(struct regma
+ 			return ret;
+ 	}
+ 
++	reg += map->reg_base;
+ 	reg >>= map->format.reg_downshift;
+ 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
+ 	regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
+--- a/include/linux/regmap.h
++++ b/include/linux/regmap.h
+@@ -239,6 +239,8 @@ typedef void (*regmap_unlock)(void *);
+  *              used.
+  * @reg_downshift: The number of bits to downshift the register before
+  *		   performing any operations.
++ * @reg_base: Value to be added to every register address before performing any
++ *	      operation.
+  * @pad_bits: Number of bits of padding between register and value.
+  * @val_bits: Number of bits in a register value, mandatory.
+  *
+@@ -363,6 +365,7 @@ struct regmap_config {
+ 	int reg_bits;
+ 	int reg_stride;
+ 	int reg_downshift;
++	unsigned int reg_base;
+ 	int pad_bits;
+ 	int val_bits;
+ 
diff --git a/target/linux/generic/backport-5.15/352-v6.3-regmap-apply-reg_base-and-reg_downshift-for-single-r.patch b/target/linux/generic/backport-5.15/352-v6.3-regmap-apply-reg_base-and-reg_downshift-for-single-r.patch
new file mode 100644
index 0000000000..804f68d23c
--- /dev/null
+++ b/target/linux/generic/backport-5.15/352-v6.3-regmap-apply-reg_base-and-reg_downshift-for-single-r.patch
@@ -0,0 +1,57 @@
+From 697c3892d825fb78f42ec8e53bed065dd728db3e Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Mon, 30 Jan 2023 02:04:57 +0000
+Subject: [PATCH] regmap: apply reg_base and reg_downshift for single register
+ ops
+
+reg_base and reg_downshift currently don't have any effect if used with
+a regmap_bus or regmap_config which only offers single register
+operations (ie. reg_read, reg_write and optionally reg_update_bits).
+
+Fix that and take them into account also for regmap_bus with only
+reg_read and read_write operations by applying reg_base and
+reg_downshift in _regmap_bus_reg_write, _regmap_bus_reg_read.
+
+Also apply reg_base and reg_downshift in _regmap_update_bits, but only
+in case the operation is carried out with a reg_update_bits call
+defined in either regmap_bus or regmap_config.
+
+Fixes: 0074f3f2b1e43d ("regmap: allow a defined reg_base to be added to every address")
+Fixes: 86fc59ef818beb ("regmap: add configurable downshift for addresses")
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+Tested-by: Colin Foster <colin.foster@in-advantage.com>
+Link: https://lore.kernel.org/r/Y9clyVS3tQEHlUhA@makrotopia.org
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ drivers/base/regmap/regmap.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/base/regmap/regmap.c
++++ b/drivers/base/regmap/regmap.c
+@@ -1929,6 +1929,8 @@ static int _regmap_bus_reg_write(void *c
+ {
+ 	struct regmap *map = context;
+ 
++	reg += map->reg_base;
++	reg >>= map->format.reg_downshift;
+ 	return map->bus->reg_write(map->bus_context, reg, val);
+ }
+ 
+@@ -2703,6 +2705,8 @@ static int _regmap_bus_reg_read(void *co
+ {
+ 	struct regmap *map = context;
+ 
++	reg += map->reg_base;
++	reg >>= map->format.reg_downshift;
+ 	return map->bus->reg_read(map->bus_context, reg, val);
+ }
+ 
+@@ -3078,6 +3082,8 @@ static int _regmap_update_bits(struct re
+ 		*change = false;
+ 
+ 	if (regmap_volatile(map, reg) && map->reg_update_bits) {
++		reg += map->reg_base;
++		reg >>= map->format.reg_downshift;
+ 		ret = map->reg_update_bits(map->bus_context, reg, mask, val);
+ 		if (ret == 0 && change)
+ 			*change = true;
diff --git a/target/linux/generic/hack-5.15/259-regmap_dynamic.patch b/target/linux/generic/hack-5.15/259-regmap_dynamic.patch
index 6be5875177..76a5ace6f3 100644
--- a/target/linux/generic/hack-5.15/259-regmap_dynamic.patch
+++ b/target/linux/generic/hack-5.15/259-regmap_dynamic.patch
@@ -125,7 +125,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  #include <linux/mutex.h>
  #include <linux/err.h>
  #include <linux/property.h>
-@@ -3341,3 +3342,5 @@ static int __init regmap_initcall(void)
+@@ -3358,3 +3359,5 @@ static int __init regmap_initcall(void)
  	return 0;
  }
  postcore_initcall(regmap_initcall);