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mtd: rawnand: marvell: Fix clock resource by adding a register clock 

On Armada 7K/8K we need to explicitly enable the register clock. This
clock is optional because not all the SoCs using this IP need it but at
least for Armada 7K/8K it is actually mandatory.

The binding documentation is updated accordingly.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Gregory CLEMENT 2018-03-13 11:30:16 +01:00 committed by Boris Brezillon
parent b120612206
commit 961ba15c48
2 changed files with 32 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/devicetree/bindings/mtd/marvell-nand.txt
View File

@ -14,7 +14,10 @@ Required properties:
- #address-cells: shall be set to 1. Encode the NAND CS.
- #size-cells: shall be set to 0.
- interrupts: shall define the NAND controller interrupt.
- clocks: shall reference the NAND controller clock.
- clocks: shall reference the NAND controller clocks, the second one is
is only needed for the Armada 7K/8K SoCs
- clock-names: mandatory if there is a second clock, in this case there
should be one clock named "core" and another one named "reg"
- marvell,system-controller: Set to retrieve the syscon node that handles
NAND controller related registers (only required with the
"marvell,armada-8k-nand[-controller]" compatibles).

34
drivers/mtd/nand/raw/marvell_nand.c
View File

@ -308,6 +308,7 @@ struct marvell_nfc_caps {
* @dev: Parent device (used to print error messages)
* @regs: NAND controller registers
* @ecc_clk: ECC block clock, two times the NAND controller clock
* @reg_clk: Regiters clock
* @complete: Completion object to wait for NAND controller events
* @assigned_cs: Bitmask describing already assigned CS lines
* @chips: List containing all the NAND chips attached to
@ -321,6 +322,7 @@ struct marvell_nfc {
struct device *dev;
void __iomem *regs;
struct clk *ecc_clk;
struct clk *reg_clk;
struct completion complete;
unsigned long assigned_cs;
struct list_head chips;
@ -2757,7 +2759,12 @@ static int marvell_nfc_probe(struct platform_device *pdev)
return irq;
}
nfc->ecc_clk = devm_clk_get(&pdev->dev, NULL);
nfc->ecc_clk = devm_clk_get(&pdev->dev, "core");
/* Managed the legacy case (when the first clock was not named) */
if (nfc->ecc_clk == ERR_PTR(-ENOENT))
nfc->ecc_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(nfc->ecc_clk))
return PTR_ERR(nfc->ecc_clk);
@ -2765,12 +2772,24 @@ static int marvell_nfc_probe(struct platform_device *pdev)
if (ret)
return ret;
nfc->reg_clk = devm_clk_get(&pdev->dev, "reg");
if (PTR_ERR(nfc->reg_clk) != -ENOENT) {
if (!IS_ERR(nfc->reg_clk)) {
ret = clk_prepare_enable(nfc->reg_clk);
if (ret)
goto unprepare_ecc_clk;
} else {
ret = PTR_ERR(nfc->reg_clk);
goto unprepare_ecc_clk;
}
}
marvell_nfc_disable_int(nfc, NDCR_ALL_INT);
marvell_nfc_clear_int(nfc, NDCR_ALL_INT);
ret = devm_request_irq(dev, irq, marvell_nfc_isr,
0, "marvell-nfc", nfc);
if (ret)
goto unprepare_clk;
goto unprepare_reg_clk;
/* Get NAND controller capabilities */
if (pdev->id_entry)
@ -2781,23 +2800,25 @@ static int marvell_nfc_probe(struct platform_device *pdev)
if (!nfc->caps) {
dev_err(dev, "Could not retrieve NFC caps\n");
ret = -EINVAL;
goto unprepare_clk;
goto unprepare_reg_clk;
}
/* Init the controller and then probe the chips */
ret = marvell_nfc_init(nfc);
if (ret)
goto unprepare_clk;
goto unprepare_reg_clk;
platform_set_drvdata(pdev, nfc);
ret = marvell_nand_chips_init(dev, nfc);
if (ret)
goto unprepare_clk;
goto unprepare_reg_clk;
return 0;
unprepare_clk:
unprepare_reg_clk:
clk_disable_unprepare(nfc->reg_clk);
unprepare_ecc_clk:
clk_disable_unprepare(nfc->ecc_clk);
return ret;
@ -2814,6 +2835,7 @@ static int marvell_nfc_remove(struct platform_device *pdev)
dma_release_channel(nfc->dma_chan);
}
clk_disable_unprepare(nfc->reg_clk);
clk_disable_unprepare(nfc->ecc_clk);
return 0;