diff options
| author | Boris BREZILLON <boris.brezillon@free-electrons.com> | 2014-09-13 01:23:59 +0200 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2014-09-17 00:45:11 -0700 |
| commit | 2d405ec5fdd5b6848beb820301d4fcaa3e2c4159 (patch) | |
| tree | 578b734e079cf35ac3fadbd6ac9f26e713a6ba29 /drivers/mtd | |
| parent | 55ab9ec99bbfb4450dfa9bc0fd9e2c5052f4c3f7 (diff) | |
mtd: nand: atmel_nand: retrieve NFC clock
Retrieve the NFC clock to make sure it is enabled. Make that optional to ensure
compatibility with previous device trees but document it as mandatory so newer
device trees will include it.
Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 9c5f717bda5..d1e502f8dbd 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -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 = { |