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SubjectRe: [PATCH v4 1/3] reset: imx7: Add plubming to support multiple IP variants
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On Wed, 2018-12-19 at 17:06 -0800, Andrey Smirnov wrote:
> In order to enable supporting i.MX8MQ with this driver, convert it to
> expect variant specific bits to be passed via driver data.
>
> Cc: p.zabel@pengutronix.de
> Cc: Fabio Estevam <fabio.estevam@nxp.com>
> Cc: cphealy@gmail.com
> Cc: l.stach@pengutronix.de
> Cc: Leonard Crestez <leonard.crestez@nxp.com>
> Cc: "A.s. Dong" <aisheng.dong@nxp.com>
> Cc: Richard Zhu <hongxing.zhu@nxp.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: linux-imx@nxp.com
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
> drivers/reset/reset-imx7.c | 62 +++++++++++++++++++++++++++-----------
> 1 file changed, 45 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
> index 77911fa8f31d..3a36d5863891 100644
> --- a/drivers/reset/reset-imx7.c
> +++ b/drivers/reset/reset-imx7.c
> @@ -17,14 +17,29 @@
>
> #include <linux/mfd/syscon.h>
> #include <linux/mod_devicetable.h>
> +#include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/reset-controller.h>
> #include <linux/regmap.h>
> #include <dt-bindings/reset/imx7-reset.h>
>
> +struct imx7_src_signal {
> + unsigned int offset, bit;
> +};
> +
> +struct imx7_src;
> +
> +struct imx7_src_variant {
> + const struct imx7_src_signal *signals;
> + unsigned int signals_num;
> + unsigned int (*prepare)(struct imx7_src *imx7src, unsigned long id,
> + bool assert);

Instead of adding a function pointer indirection, I'd prefer separate
imx7_reset_ops and imx8m_reset_ops set by the variant, see below.

> +};
> +
> struct imx7_src {
> struct reset_controller_dev rcdev;
> struct regmap *regmap;
> + const struct imx7_src_variant *variant;

This could then replaced with a direct pointer to the respective signals
array.

> };
>
> enum imx7_src_registers {
> @@ -39,10 +54,6 @@ enum imx7_src_registers {
> SRC_DDRC_RCR = 0x1000,
> };
>
> -struct imx7_src_signal {
> - unsigned int offset, bit;
> -};
> -
> static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
> [IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
> [IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
> @@ -72,17 +83,11 @@ static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
> [IMX7_RESET_DDRC_CORE_RST] = { SRC_DDRC_RCR, BIT(1) },
> };
>
> -static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
> +static unsigned int
> +imx7_src_prepare(struct imx7_src *imx7src, unsigned long id, bool assert)
> {
> - return container_of(rcdev, struct imx7_src, rcdev);
> -}
> -
> -static int imx7_reset_set(struct reset_controller_dev *rcdev,
> - unsigned long id, bool assert)
> -{
> - struct imx7_src *imx7src = to_imx7_src(rcdev);
> - const struct imx7_src_signal *signal = &imx7_src_signals[id];
> - unsigned int value = assert ? signal->bit : 0;
> + const unsigned int bit = imx7src->variant->signals[id].bit;
> + unsigned int value = assert ? bit : 0;
>
> switch (id) {
> case IMX7_RESET_PCIEPHY:
> @@ -95,10 +100,32 @@ static int imx7_reset_set(struct reset_controller_dev *rcdev,
> break;
>
> case IMX7_RESET_PCIE_CTRL_APPS_EN:
> - value = (assert) ? 0 : signal->bit;
> + value = assert ? 0 : bit;
> break;
> }
>
> + return value;
> +}

Instead of having a common imx7_reset_set and then calling the custom
.prepare() through a function pointer, I'd suggest to have custom
imx7_reset_set and imx8m_reset_set functions that contain the code from
.prepare() and then call a common function to do the actual register
access.

> +
> +static const struct imx7_src_variant variant_imx7 = {
> + .signals = imx7_src_signals,
> + .signals_num = ARRAY_SIZE(imx7_src_signals),
> + .prepare = imx7_src_prepare,
> +};
> +
> +static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
> +{
> + return container_of(rcdev, struct imx7_src, rcdev);
> +}
> +
> +static int imx7_reset_set(struct reset_controller_dev *rcdev,
> + unsigned long id, bool assert)
> +{
> + struct imx7_src *imx7src = to_imx7_src(rcdev);
> + const struct imx7_src_variant *variant = imx7src->variant;
> + const struct imx7_src_signal *signal = &variant->signals[id];
> + const unsigned int value = variant->prepare(imx7src, id, assert);
> +
> return regmap_update_bits(imx7src->regmap,
> signal->offset, signal->bit, value);
> }
> @@ -130,6 +157,7 @@ static int imx7_reset_probe(struct platform_device *pdev)
> if (!imx7src)
> return -ENOMEM;
>
> + imx7src->variant = of_device_get_match_data(dev);
> imx7src->regmap = syscon_node_to_regmap(dev->of_node);
> if (IS_ERR(imx7src->regmap)) {
> dev_err(dev, "Unable to get imx7-src regmap");
> @@ -138,7 +166,7 @@ static int imx7_reset_probe(struct platform_device *pdev)
> regmap_attach_dev(dev, imx7src->regmap, &config);
>
> imx7src->rcdev.owner = THIS_MODULE;
> - imx7src->rcdev.nr_resets = IMX7_RESET_NUM;
> + imx7src->rcdev.nr_resets = imx7src->variant->signals_num;
> imx7src->rcdev.ops = &imx7_reset_ops;
> imx7src->rcdev.of_node = dev->of_node;
>
> @@ -146,7 +174,7 @@ static int imx7_reset_probe(struct platform_device *pdev)
> }
>
> static const struct of_device_id imx7_reset_dt_ids[] = {
> - { .compatible = "fsl,imx7d-src", },
> + { .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
> { /* sentinel */ },
> };

regards
Phililipp

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