mtd: nand: atmel_nand: retrieve NFC clock (2d405ec5) · Commits · 戴 / test

Documentation/devicetree/bindings/mtd/atmel-nand.txt

+2 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,7 @@ Optional properties:
		- reg : should specify the address and size used for NFC command registers,
		NFC registers and NFC Sram. NFC Sram address and size can be absent
		if don't want to use it.
		- clocks: phandle to the peripheral clock
		- Optional properties:
		- atmel,write-by-sram: boolean to enable NFC write by sram.

		@@ -98,6 +99,7 @@ nand0: nand@40000000 {
		compatible = "atmel,sama5d3-nfc";
		#address-cells = <1>;
		#size-cells = <1>;
		clocks = <&hsmc_clk>
		reg = <
		0x70000000 0x10000000 /* NFC Command Registers */
		0xffffc000 0x00000070 /* NFC HSMC regs */

drivers/mtd/nand/atmel_nand.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@
		*
		*/

		#include <linux/clk.h>
		#include <linux/dma-mapping.h>
		#include <linux/slab.h>
		#include <linux/module.h>
		@@ -96,6 +97,8 @@ struct atmel_nfc {
		bool use_nfc_sram;
		bool write_by_sram;

		struct clk *clk;

		bool is_initialized;
		struct completion comp_ready;
		struct completion comp_cmd_done;
		@@ -2248,6 +2251,7 @@ static int atmel_nand_nfc_probe(struct platform_device *pdev)
		{
		struct atmel_nfc *nfc = &nand_nfc;
		struct resource nfc_cmd_regs, nfc_hsmc_regs, *nfc_sram;
		int ret;

		nfc_cmd_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		nfc->base_cmd_regs = devm_ioremap_resource(&pdev->dev, nfc_cmd_regs);
		@@ -2279,8 +2283,28 @@ static int atmel_nand_nfc_probe(struct platform_device *pdev)
		nfc_writel(nfc->hsmc_regs, IDR, 0xffffffff);
		nfc_readl(nfc->hsmc_regs, SR); /* clear the NFC_SR */

		nfc->clk = devm_clk_get(&pdev->dev, NULL);
		if (!IS_ERR(nfc->clk)) {
		ret = clk_prepare_enable(nfc->clk);
		if (ret)
		return ret;
		} else {
		dev_warn(&pdev->dev, "NFC clock missing, update your Device Tree");
		}

		nfc->is_initialized = true;
		dev_info(&pdev->dev, "NFC is probed.\n");

		return 0;
		}

		static int atmel_nand_nfc_remove(struct platform_device *pdev)
		{
		struct atmel_nfc *nfc = &nand_nfc;

		if (!IS_ERR(nfc->clk))
		clk_disable_unprepare(nfc->clk);

		return 0;
		}

		@@ -2297,6 +2321,7 @@ static struct platform_driver atmel_nand_nfc_driver = {
		.of_match_table = of_match_ptr(atmel_nand_nfc_match),
		},
		.probe = atmel_nand_nfc_probe,
		.remove = atmel_nand_nfc_remove,
		};

		static struct platform_driver atmel_nand_driver = {

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