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Date: Mon, 23 Sep 2013 16:00:05 +0200
From: Tomasz Figa <t.figa@...sung.com>
To: Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
Cc: kyungmin.park@...sung.com, dwmw2@...radead.org,
grant.likely@...aro.org, devicetree@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mtd@...ts.infradead.org, rob.herring@...xeda.com,
pawel.moll@....com, mark.rutland@....com, swarren@...dotorg.org,
ijc+devicetree@...lion.org.uk, rob@...dley.net,
linux-samsung-soc@...r.kernel.org, m.szyprowski@...sung.com,
b.zolnierkie@...sung.com
Subject: Re: [PATCH v2] MTD: Onenand: Add device tree support for samsung
onenand
Hi Mateusz,
On Monday 23 of September 2013 15:06:48 Mateusz Krawczuk wrote:
> This patch add clk and device tree nodes for samsung onenand driver.
>
> since v1:
> Updated Documentation according to Mark Rutland notes.
>
> Signed-off-by: Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> ---
> .../devicetree/bindings/mtd/samsung-onenand.txt | 44 ++++++++++++++++++++++
> drivers/mtd/onenand/samsung.c | 37 +++++++++++++++++-
> 2 files changed, 80 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/mtd/samsung-onenand.txt
>
> diff --git a/Documentation/devicetree/bindings/mtd/samsung-onenand.txt b/Documentation/devicetree/bindings/mtd/samsung-onenand.txt
> new file mode 100644
> index 0000000..5bf931c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/samsung-onenand.txt
> @@ -0,0 +1,44 @@
> +Device tree bindings for Samsung Onenand
> +
> +Required properties:
> + - compatible: value should be either of the following.
> + (a) "samsung,s3c6400-onenand",
> + for onenand controller compatible with s3c6400.
> + (b) "samsung,s3c6410-onenand",
> + for onenand controller compatible with s3c6410.
> + (c) "samsung,s5pc100-onenand",
> + for onenand controller compatible with s5pc100.
> + (d) "samsung,s5pc110-onenand",
For consistency with other bindings, I would use s5pv210 here, even if
existing driver code refers to it as s5pc110. Device tree bindings are
independent from driver internals.
> + for s5pc100-like onenand controller used on s5pc110 which supports DMA.
nit: inconsistent indentation of (d) case
nit2: each subsequent indentation level should use higher indentation:
- compatible: value should be either of the following.
(a) "samsung,s3c6400-onenand",
for onenand controller compatible with s3c6400.
> +
> +Required properties for s5pc110:
> +
> + - reg: the offset and length of the control registers. First region describes
> + OneNAND interface, second control registers.
> + - interrupt-parent, interrupts Onenand memory interrupts
Inconsistent formatting of property description. The reg property above
used "property: description", while this one uses a single tab.
Also please describe both properties separately and specify how many
interrupts are required.
> +
> +Required properties for others:
> +
> + - reg: the offset and length of the control registers. First region describes
> + control registers, second OneNAND interface.
> +
> +Clocks:
> + - gate - clock which output is supplied to external OneNAND flash memory.
Inconsistent formatting of property description.
> +
> +
> +For partiton table parsing (optional) please refer to:
> + [1] Documentation/devicetree/bindings/mtd/partition.txt
> +
> +Example for an s5pv210 board:
> +
> + onenand@...00000 {
> + compatible = "samsung,s5pc110-onenand";
> + reg = <0xb0000000 0x20000>, <0xb0600000 0x2000>;
> + interrupt-parent = <&vic1>;
> + interrupts = <31>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + clocks = <&clocks NANDXL>;
> + clock-names = "gate";
> + status = "okay";
This status property is not a part of this binding, so it can be safely
dropped.
> + };
> diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
> index df7400d..5a2cc4b 100644
> --- a/drivers/mtd/onenand/samsung.c
> +++ b/drivers/mtd/onenand/samsung.c
> @@ -14,6 +14,7 @@
> * S5PC110: use DMA
> */
>
> +#include <linux/clk.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> #include <linux/sched.h>
> @@ -24,6 +25,7 @@
> #include <linux/dma-mapping.h>
> #include <linux/interrupt.h>
> #include <linux/io.h>
> +#include <linux/of.h>
>
> #include <asm/mach/flash.h>
>
> @@ -133,6 +135,7 @@ enum soc_type {
> struct s3c_onenand {
> struct mtd_info *mtd;
> struct platform_device *pdev;
> + struct clk *gate;
> enum soc_type type;
> void __iomem *base;
> struct resource *base_res;
> @@ -859,6 +862,19 @@ static void s3c_onenand_setup(struct mtd_info *mtd)
> this->write_bufferram = onenand_write_bufferram;
> }
>
> +static const struct of_device_id onenand_s3c_dt_match[] = {
> + { .compatible = "samsung,s3c6400-onenand",
> + .data = (void *)TYPE_S3C6400 },
> + { .compatible = "samsung,s3c6410-onenand",
> + .data = (void *)TYPE_S3C6410 },
> + { .compatible = "samsung,s5pc100-onenand",
> + .data = (void *)TYPE_S5PC100 },
> + { .compatible = "samsung,s5pc110-onenand",
> + .data = (void *)TYPE_S5PC110 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, onenand_s3c_dt_match);
> +
> static int s3c_onenand_probe(struct platform_device *pdev)
> {
> struct onenand_platform_data *pdata;
> @@ -883,12 +899,26 @@ static int s3c_onenand_probe(struct platform_device *pdev)
> goto onenand_fail;
> }
>
> + onenand->gate = clk_get(&pdev->dev, "gate");
You can use devm_clk_get() here to remove the need to explicitly put the
clock at remove.
> + if (IS_ERR(onenand->gate))
> + return PTR_ERR(onenand->gate);
> + clk_prepare_enable(onenand->gate);
> +
This is a separate change that should be submitted as a separate patch.
Also you need to add a clk_disable_unprepare() in error path at the
bottom of this function.
Best regards,
Tomasz
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