Re: [PATCH v2 11/18] crypto: rockhip: do not handle dma clock

Johan Jonker
2022-03-04T15:02:25Z

Hi Corentin,

Make your clock driver parsing portable.

===
oneOf:
- const: rockchip,rk3288-crypto
- items:
- enum:
- rockchip,rk3328-crypto
- const: rockchip,rk3288-crypto

Compatible string must be SoC related!

rk3288 was the first in line that had support, so we use that as fall
back string.

===

Make binding fit for more SoC types.
Allow more clocks by using devm_clk_bulk_get_all.
Drop reset-names requirement for devm_reset_control_array_get_exclusive.

===

Use a patch order to prevent the scripts generate notifications.

- dt-bindings conversion

- add rk3328 compatible string in a separate patch

- your driver changes

- dts patches

A proposed maintainer must be able to submit patch series without errors. ;)

===

When you remove a clock in a YAML conversion you must add a note to the
DT maintainer.

===

Johan

On 3/2/22 22:11, Corentin Labbe wrote:
> The DMA clock is handled by the DMA controller, so the crypto does not
> have to touch it.
>
> Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
> ---
> drivers/crypto/rockchip/rk3288_crypto.c | 16 +---------------
> drivers/crypto/rockchip/rk3288_crypto.h | 1 -
> 2 files changed, 1 insertion(+), 16 deletions(-)
>
> diff --git a/drivers/crypto/rockchip/rk3288_crypto.c b/drivers/crypto/rockchip/rk3288_crypto.c
> index 94ef1283789f..645855d2651b 100644
> --- a/drivers/crypto/rockchip/rk3288_crypto.c
> +++ b/drivers/crypto/rockchip/rk3288_crypto.c
> @@ -40,15 +40,8 @@ static int rk_crypto_enable_clk(struct rk_crypto_info *dev)
> __func__, __LINE__);
> goto err_hclk;
> }
> - err = clk_prepare_enable(dev->dmaclk);
> - if (err) {
> - dev_err(dev->dev, "[%s:%d], Couldn't enable clock dmaclk\n",
> - __func__, __LINE__);
> - goto err_dmaclk;
> - }
> +
> return err;
> -err_dmaclk:
> - clk_disable_unprepare(dev->hclk);
> err_hclk:
> clk_disable_unprepare(dev->aclk);
> err_aclk:
> @@ -59,7 +52,6 @@ static int rk_crypto_enable_clk(struct rk_crypto_info *dev)
>
> static void rk_crypto_disable_clk(struct rk_crypto_info *dev)
> {
> - clk_disable_unprepare(dev->dmaclk);
> clk_disable_unprepare(dev->hclk);
> clk_disable_unprepare(dev->aclk);
> clk_disable_unprepare(dev->sclk);
> @@ -199,12 +191,6 @@ static int rk_crypto_probe(struct platform_device *pdev)
> goto err_crypto;
> }
>

> - crypto_info->dmaclk = devm_clk_get(&pdev->dev, "apb_pclk");
> - if (IS_ERR(crypto_info->dmaclk)) {
> - err = PTR_ERR(crypto_info->dmaclk);
> - goto err_crypto;
> - }
> -

rk3288:
clocks = <&cru ACLK_CRYPTO>, <&cru HCLK_CRYPTO>,
- <&cru SCLK_CRYPTO>, <&cru ACLK_DMAC1>;
- clock-names = "aclk", "hclk", "sclk", "apb_pclk";
+ <&cru SCLK_CRYPTO>;
+ clock-names = "aclk", "hclk", "sclk";

rk3328:
+ clocks = <&cru HCLK_CRYPTO_MST>, <&cru HCLK_CRYPTO_SLV>,
+ <&cru SCLK_CRYPTO>;
+ clock-names = "aclk", "hclk", "sclk";

The HCLK_CRYPTO_MST not is related to ACLK_CRYPTO.
You are reusing rk3288 names to not to change the driver.
Give it an other name.

===

The sclk goes through a crypto_div_con.
Does that need a frequency set?
Or does that come from nowhere?

From crypto_v1.c
priv->frequency = dev_read_u32_default(dev, "clock-frequency",
CRYPTO_V1_DEFAULT_RATE);

ret = clk_set_rate(&priv->sclk, priv->frequency);

===

Could you make this portable?
Example:

int i;

priv->num_clks = devm_clk_bulk_get_all(dev, &priv->clks);
if (priv->num_clks < 1)
return -EINVAL;

priv->sclk = NULL;
for (i = 0; i < priv->num_clks; i++) {
if (!strncmp(priv->clks[i].id, "sclk", 3)) {
priv->sclk = priv->clks[i].clk;
break;
}
}

if (!priv->sclk) {
dev_err(dev, "no sclk found\n");
return -EINVAL;
}

Also add optional "sclk1" clock for rk3399.
Use "sclk" and not "sclk0" to be backwards compatible.

===

Also make the resets portable for rk3399.
Remove the requirement for "reset-names".

Example:
priv->phy_rst = devm_reset_control_array_get_exclusive(dev);
if (IS_ERR(priv->phy_rst))
return dev_err_probe(dev, PTR_ERR(priv->phy_rst), "failed to get phy
reset\n");

> crypto_info->irq = platform_get_irq(pdev, 0);
> if (crypto_info->irq < 0) {
> dev_err(&pdev->dev, "control Interrupt is not available.\n");
> diff --git a/drivers/crypto/rockchip/rk3288_crypto.h b/drivers/crypto/rockchip/rk3288_crypto.h
> index c741e97057dc..963fbfc4d14e 100644
> --- a/drivers/crypto/rockchip/rk3288_crypto.h
> +++ b/drivers/crypto/rockchip/rk3288_crypto.h
> @@ -191,7 +191,6 @@ struct rk_crypto_info {

> struct clk *aclk;
> struct clk *hclk;
> struct clk *sclk;
> - struct clk *dmaclk;

int num_clks;
struct clk_bulk_data *clks;
struct clk *sclk;
struct clk *sclk1;

> struct reset_control *rst;
> void __iomem *reg;
> int irq;