Merge tag 'mtd/for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

Pull mtd updates from Miquel Raynal:
 "MTD core changes:
   - Call of_platform_populate() for MTD partitions
   - Check devicetree alias for index
   - mtdoops:
      - Add a timestamp to the mtdoops header.
      - Create a header structure for the saved mtdoops.
      - Fix the size of the header read buffer.
   - mtdblock: Warn if opened on NAND
   - Bindings:
      - reserved-memory: Support MTD/block device
      - jedec,spi-nor: remove unneeded properties
      - Extend fixed-partitions binding
      - Add Sercomm (Suzhou) Corporation vendor prefix

  MTD driver changes:
   - st_spi_fsm: add missing clk_disable_unprepare() in stfsm_remove()
   - phram:
      - Allow cached mappings
      - Allow probing via reserved-memory
   - maps: ixp4xx: Drop driver
   - bcm47xxpart: Print correct offset on read error

  CFI driver changes:
   - Rename chip_ready variables
   - Add S29GL064N ID definition
   - Use chip_ready() for write on S29GL064N
   - Move and rename chip_check/chip_ready/chip_good_for_write

  NAND core changes:
   - Print offset instead of page number for bad blocks

  Raw NAND controller drivers:
   - Cadence: Fix possible null-ptr-deref in cadence_nand_dt_probe()
   - CS553X: simplify the return expression of cs553x_write_ctrl_byte()
   - Davinci: Remove redundant unsigned comparison to zero
   - Denali: Use managed device resources
   - GPMI:
      - Add large oob bch setting support
      - Rename the variable ecc_chunk_size
      - Uninline the gpmi_check_ecc function
      - Add strict ecc strength check
      - Refactor BCH geometry settings function
   - Intel: Fix possible null-ptr-deref in ebu_nand_probe()
   - MPC5121: Check before clk_disable_unprepare() not needed
   - Mtk:
      - MTD_NAND_ECC_MEDIATEK should depend on ARCH_MEDIATEK
      - Also parse the default nand-ecc-engine property if available
      - Make mtk_ecc.c a separated module
   - OMAP ELM:
      - Convert the bindings to yaml
      - Describe the bindings for AM64 ELM
      - Add support for its compatible
   - Renesas: Use runtime PM instead of the raw clock API and update the
     bindings accordingly
   - Rockchip: Check before clk_disable_unprepare() not needed
   - TMIO: Check return value after calling platform_get_resource()

  Raw NAND chip driver:
   - Kioxia: Add support for TH58NVG3S0HBAI4 and TC58NVG0S3HTA00

  SPI-NAND chip drivers:
   - Gigadevice:
      - Add support for:
         - GD5FxGM7xExxG
         - GD5F{2,4}GQ5xExxG
         - GD5F1GQ5RExxG
         - GD5FxGQ4xExxG
      - Fix Quad IO for GD5F1GQ5UExxG
   - XTX: Add support for XT26G0xA

  SPI NOR core changes:
   - Read back written SR value to make sure the write was done
     correctly.
   - Introduce a common function for Read ID that manufacturer drivers
     can use to verify the Octal DTR switch worked correctly.
   - Add helpers for read/write any register commands so manufacturer
     drivers don't open code it every time.
   - Clarify rdsr dummy cycles documentation.
   - Add debugfs entry to expose internal flash parameters and state.

  SPI NOR manufacturer drivers changes:
   - Add support for Winbond W25Q512NW-IM, and Eon EN25QH256A.
   - Move spi_nor_write_ear() to Winbond module since only Winbond
     flashes use it.
   - Rework Micron and Cypress Octal DTR enable methods to improve
     readability.
   - Use the common Read ID function to verify switch to Octal DTR mode
     for Micron and Cypress flashes.
   - Skip polling status on volatile register writes for Micron and
     Cypress flashes since the operation is instant"

* tag 'mtd/for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (68 commits)
  mtd: st_spi_fsm: add missing clk_disable_unprepare() in stfsm_remove()
  dt-bindings: mtd: partitions: Extend fixed-partitions binding
  dt-bindings: Add Sercomm (Suzhou) Corporation vendor prefix
  mtd: phram: Allow cached mappings
  mtd: call of_platform_populate() for MTD partitions
  mtd: rawnand: renesas: Use runtime PM instead of the raw clock API
  dt-bindings: mtd: renesas: Fix the NAND controller description
  mtd: rawnand: mpc5121: Check before clk_disable_unprepare() not needed
  mtd: rawnand: rockchip: Check before clk_disable_unprepare() not needed
  mtd: nand: MTD_NAND_ECC_MEDIATEK should depend on ARCH_MEDIATEK
  mtd: rawnand: cs553x: simplify the return expression of cs553x_write_ctrl_byte()
  mtd: rawnand: kioxia: Add support for TH58NVG3S0HBAI4
  mtd: spi-nor: debugfs: fix format specifier
  mtd: spi-nor: support eon en25qh256a variant
  mtd: spi-nor: winbond: add support for W25Q512NW-IM
  mtd: spi-nor: expose internal parameters via debugfs
  mtd: spi-nor: export spi_nor_hwcaps_pp2cmd()
  mtd: spi-nor: move spi_nor_write_ear() to winbond module
  mtd: spi-nor: amend the rdsr dummy cycles documentation
  mtd: cfi_cmdset_0002: Rename chip_ready variables
  ...

1 files changed, 99 insertions, 9 deletions

diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
index d503821a3e60..208bd4d871f4 100644
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -27,10 +27,14 @@
 #include <linux/slab.h>
 #include <linux/mtd/mtd.h>
 #include <asm/div64.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
 
 struct phram_mtd_list {
 	struct mtd_info mtd;
 	struct list_head list;
+	bool cached;
 };
 
 static LIST_HEAD(phram_list);
@@ -77,20 +81,51 @@ static int phram_write(struct mtd_info *mtd, loff_t to, size_t len,
 	return 0;
 }
 
+static int phram_map(struct phram_mtd_list *phram, phys_addr_t start, size_t len)
+{
+	void *addr = NULL;
+
+	if (phram->cached)
+		addr = memremap(start, len, MEMREMAP_WB);
+	else
+		addr = (void __force *)ioremap(start, len);
+	if (!addr)
+		return -EIO;
+
+	phram->mtd.priv = addr;
+
+	return 0;
+}
+
+static void phram_unmap(struct phram_mtd_list *phram)
+{
+	void *addr = phram->mtd.priv;
+
+	if (phram->cached) {
+		memunmap(addr);
+		return;
+	}
+
+	iounmap((void __iomem *)addr);
+}
+
 static void unregister_devices(void)
 {
 	struct phram_mtd_list *this, *safe;
 
 	list_for_each_entry_safe(this, safe, &phram_list, list) {
 		mtd_device_unregister(&this->mtd);
-		iounmap(this->mtd.priv);
+		phram_unmap(this);
 		kfree(this->mtd.name);
 		kfree(this);
 	}
 }
 
-static int register_device(char *name, phys_addr_t start, size_t len, uint32_t erasesize)
+static int register_device(struct platform_device *pdev, const char *name,
+			   phys_addr_t start, size_t len, uint32_t erasesize)
 {
+	struct device_node *np = pdev ? pdev->dev.of_node : NULL;
+	bool cached = np ? !of_property_read_bool(np, "no-map") : false;
 	struct phram_mtd_list *new;
 	int ret = -ENOMEM;
 
@@ -98,9 +133,10 @@ static int register_device(char *name, phys_addr_t start, size_t len, uint32_t e
 	if (!new)
 		goto out0;
 
-	ret = -EIO;
-	new->mtd.priv = ioremap(start, len);
-	if (!new->mtd.priv) {
+	new->cached = cached;
+
+	ret = phram_map(new, start, len);
+	if (ret) {
 		pr_err("ioremap failed\n");
 		goto out1;
 	}
@@ -119,17 +155,23 @@ static int register_device(char *name, phys_addr_t start, size_t len, uint32_t e
 	new->mtd.erasesize = erasesize;
 	new->mtd.writesize = 1;
 
+	mtd_set_of_node(&new->mtd, np);
+
 	ret = -EAGAIN;
 	if (mtd_device_register(&new->mtd, NULL, 0)) {
 		pr_err("Failed to register new device\n");
 		goto out2;
 	}
 
-	list_add_tail(&new->list, &phram_list);
+	if (pdev)
+		platform_set_drvdata(pdev, new);
+	else
+		list_add_tail(&new->list, &phram_list);
+
 	return 0;
 
 out2:
-	iounmap(new->mtd.priv);
+	phram_unmap(new);
 out1:
 	kfree(new);
 out0:
@@ -278,7 +320,7 @@ static int phram_setup(const char *val)
 		goto error;
 	}
 
-	ret = register_device(name, start, len, (uint32_t)erasesize);
+	ret = register_device(NULL, name, start, len, (uint32_t)erasesize);
 	if (ret)
 		goto error;
 
@@ -325,10 +367,54 @@ static int phram_param_call(const char *val, const struct kernel_param *kp)
 module_param_call(phram, phram_param_call, NULL, NULL, 0200);
 MODULE_PARM_DESC(phram, "Memory region to map. \"phram=<name>,<start>,<length>[,<erasesize>]\"");
 
+#ifdef CONFIG_OF
+static const struct of_device_id phram_of_match[] = {
+	{ .compatible = "phram" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, phram_of_match);
+#endif
+
+static int phram_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOMEM;
+
+	/* mtd_set_of_node() reads name from "label" */
+	return register_device(pdev, NULL, res->start, resource_size(res),
+			       PAGE_SIZE);
+}
+
+static int phram_remove(struct platform_device *pdev)
+{
+	struct phram_mtd_list *phram = platform_get_drvdata(pdev);
+
+	mtd_device_unregister(&phram->mtd);
+	phram_unmap(phram);
+	kfree(phram);
+
+	return 0;
+}
+
+static struct platform_driver phram_driver = {
+	.probe		= phram_probe,
+	.remove		= phram_remove,
+	.driver		= {
+		.name		= "phram",
+		.of_match_table	= of_match_ptr(phram_of_match),
+	},
+};
 
 static int __init init_phram(void)
 {
-	int ret = 0;
+	int ret;
+
+	ret = platform_driver_register(&phram_driver);
+	if (ret)
+		return ret;
 
 #ifndef MODULE
 	if (phram_paramline[0])
@@ -336,12 +422,16 @@ static int __init init_phram(void)
 	phram_init_called = 1;
 #endif
 
+	if (ret)
+		platform_driver_unregister(&phram_driver);
+
 	return ret;
 }
 
 static void __exit cleanup_phram(void)
 {
 	unregister_devices();
+	platform_driver_unregister(&phram_driver);
 }
 
 module_init(init_phram);