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SubjectRe: [PATCH 1/1] pinctrl: Add alternative way for specifying register bases
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Hi, Sean:

On Sun, 2019-04-14 at 16:01 -0700, Sean Wang wrote:
> Hi, Light
>
> On Thu, Apr 11, 2019 at 8:15 PM Light Hsieh <light.hsieh@mediatek.com> wrote:
> >
> > The orginal PINCTRL_MTK_PARIS/PINCTRL_MTK_MOORE need more effort for
> > specifying register bases when porting platform driver:
> > 1. Write mtXXXX_pinctrl_register_base_name[] array in pinctrl-mtXXXX.c
> > to specify names of register bases, for exmaple:
> >
> > static const char * const mt6765_pinctrl_register_base_names[] = {
> > "iocfg0", "iocfg1", "iocfg2", "iocfg3", "iocfg4", "iocfg5",
> > "iocfg6", "iocfg7",
> > };
> > 2. Write reg = <...>, ..., <...>; in mtXXXX.dts to specify register
> > bases. Each member of reg contain address range cloned from
> > pre-generated devicetree node.
> > 3. Write reg-names = "...", ..., "..."; in mtXXXX.dts to specify
> > names of register bases. The sequence of names in reg-names shall match
> > sequence of names that specified in pinctrl-mtXXXX.c.
> > Besides, the seqeunce of names in reg-names shall also match sequence of
> > address range in reg, for exmaple:
> >
> > pio: pinctrl {
> > compatible = "mediatek,mt6765-pinctrl";
> > reg = <0 0x10005000 0 0x1000>,
> > <0 0x10002C00 0 0x200>,
> > <0 0x10002800 0 0x200>,
> > <0 0x10002A00 0 0x200>,
> > <0 0x10002000 0 0x200>,
> > <0 0x10002200 0 0x200>,
> > <0 0x10002400 0 0x200>,
> > <0 0x10002600 0 0x200>,
> > <0 0x1000b000 0 0x1000>;
> > reg-names = "iocfg0", "iocfg1", "iocfg2", "iocfg3",
> > "iocfg4", "iocfg5", "iocfg6", "iocfg7",
> > "eint";
> >
> > To reduce porting effort, this patch add an alternative way for specifying
> > register bases:
> > 1. Write reg_bases = <...>, ..., <...>; and reg_base_eint = <&eint>;
> > in mtXXXX.dtsi where members in reg_bases and &eint are labels for
> > pre-generated devicetree nodes, for example:
> > pio: pinctrl {
> > compatible = "mediatek,mt6765-pinctrl";
> > reg_bases = <&gpio0>,
> > <&iocfg0>,
> > <&iocfg1>,
> > <&iocfg2>,
> > <&iocfg3>,
> > <&iocfg4>,
> > <&iocfg5>,
> > <&iocfg6>,
> > <&iocfg7>;
> > reg_base_eint = <&eint>;
>
> reg and reg-names both are generic properties used in all of DT-based
> device and driver, described in
> Documentation/devicetree/bindings/resource-names.txt, but reg_based
> and reg_base_eint aren't.
>
> If these properties are not hardware specific related, I personally
> will encourage reusing those generic properties and relevant helpers
> because those generic properties handling in the base driver are
> almost bug-free, well maintained and even keep be extended in the
> future. This way can help driver people put more concentration on
> hardware specific stuff in the driver.
>

This modification is somewhat like mtk pinctrl driver V1. In V1,
you may have the following devicetree (refer to
Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt):
:
syscfg_pctl_a: syscfg-pctl-a@10005000 {
compatible = "mediatek,mt8135-pctl-a-syscfg", "syscon";
reg = <0 0x10005000 0 0x1000>;
};

syscfg_pctl_b: syscfg-pctl-b@1020c020 {
compatible = "mediatek,mt8135-pctl-b-syscfg", "syscon";
reg = <0 0x1020C020 0 0x1000>;
};

pinctrl@1c20800 {
compatible = "mediatek,mt8135-pinctrl";
mediatek,pctl-regmap = <&syscfg_pctl_a &syscfg_pctl_b>;


and have following code in pinctrl-mtk-common.c:
node = of_parse_phandle(np, "mediatek,pctl-regmap", 0);
node = of_parse_phandle(np, "mediatek,pctl-regmap", 1);

"mediatek, pctl-regmap" is self-defined devicetree property only used
by mtk pinctrl drver V1.

Now, I use similar logic with another property name.So I don't think
the can add risk.
Besides, since this way reduce porting effort and avoid human-error
when writing devicetree and c code about device tree porting, it also
help driver people put more concentration on hardware specific stuff in
the driver.

> >
> > Since this pre-generated nodes had already specify address range,
> > it is not necessary to specify address range again in pinctrl node.
> >
> > Using this way, porting effort is reduced and therefore typo can occur with
> > less chance.
> >
> > Change-Id: I55f5e328919f4f736ca4b9f8d1593e069f179637
> > ---
> > drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 19 +++++---
> > drivers/pinctrl/mediatek/pinctrl-paris.c | 62 ++++++++++++++++--------
> > 2 files changed, 54 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > index b1c3684..16b4863 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> > @@ -12,6 +12,7 @@
> > #include <linux/platform_device.h>
> > #include <linux/io.h>
> > #include <linux/of_irq.h>
> > +#include <linux/of_address.h>
> >
> > #include "mtk-eint.h"
> > #include "pinctrl-mtk-common-v2.h"
> > @@ -310,7 +311,7 @@ static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
> >
> > int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
> > {
> > - struct device_node *np = pdev->dev.of_node;
> > + struct device_node *np = pdev->dev.of_node, *node;
> > struct resource *res;
> >
> > if (!IS_ENABLED(CONFIG_EINT_MTK))
> > @@ -323,13 +324,19 @@ int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
> > if (!hw->eint)
> > return -ENOMEM;
> >
> > - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "eint");
> > - if (!res) {
> > - dev_err(&pdev->dev, "Unable to get eint resource\n");
> > - return -ENODEV;
> > + node = of_parse_phandle(np, "reg_base_eint", 0);
> > + if (node) {
> > + hw->eint->base = of_iomap(node, 0);
> > + } else {
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > + "eint");
> > + if (!res) {
> > + dev_err(&pdev->dev, "Unable to get eint resource\n");
> > + return -ENODEV;
> > + }
> > + hw->eint->base = devm_ioremap_resource(&pdev->dev, res);
> > }
> >
> > - hw->eint->base = devm_ioremap_resource(&pdev->dev, res);
> > if (IS_ERR(hw->eint->base))
> > return PTR_ERR(hw->eint->base);
> >
> > diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> > index b59e108..8ddb995 100644
> > --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> > +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> > @@ -9,6 +9,7 @@
> > * Hongzhou.Yang <hongzhou.yang@mediatek.com>
> > */
> >
> > +#include <linux/of_address.h>
> > #include <linux/gpio/driver.h>
> > #include <dt-bindings/pinctrl/mt65xx.h>
> > #include "pinctrl-paris.h"
> > @@ -815,10 +816,11 @@ static int mtk_pctrl_build_state(struct platform_device *pdev)
> > int mtk_paris_pinctrl_probe(struct platform_device *pdev,
> > const struct mtk_pin_soc *soc)
> > {
> > + struct device_node *np = pdev->dev.of_node, *node;
> > struct pinctrl_pin_desc *pins;
> > struct mtk_pinctrl *hw;
> > struct resource *res;
> > - int err, i;
> > + int err, i, get_base_pass;
> >
> > hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
> > if (!hw)
> > @@ -828,31 +830,49 @@ int mtk_paris_pinctrl_probe(struct platform_device *pdev,
> > hw->soc = soc;
> > hw->dev = &pdev->dev;
> >
> > - if (!hw->soc->nbase_names) {
> > - dev_err(&pdev->dev,
> > - "SoC should be assigned at least one register base\n");
> > - return -EINVAL;
> > - }
> > -
> > - hw->base = devm_kmalloc_array(&pdev->dev, hw->soc->nbase_names,
> > + if (hw->soc->nbase_names) {
> > + hw->base = devm_kmalloc_array(&pdev->dev, hw->soc->nbase_names,
> > sizeof(*hw->base), GFP_KERNEL);
> > - if (!hw->base)
> > - return -ENOMEM;
> > + if (!hw->base)
> > + return -ENOMEM;
> > +
> > + for (i = 0; i < hw->soc->nbase_names; i++) {
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > + hw->soc->base_names[i]);
> > + if (!res) {
> > + dev_err(&pdev->dev, "missing IO resource\n");
> > + return -ENXIO;
> > + }
> >
> > - for (i = 0; i < hw->soc->nbase_names; i++) {
> > - res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > - hw->soc->base_names[i]);
> > - if (!res) {
> > - dev_err(&pdev->dev, "missing IO resource\n");
> > - return -ENXIO;
> > + hw->base[i] = devm_ioremap_resource(&pdev->dev, res);
> > + if (IS_ERR(hw->base[i]))
> > + return PTR_ERR(hw->base[i]);
> > }
> >
> > - hw->base[i] = devm_ioremap_resource(&pdev->dev, res);
> > - if (IS_ERR(hw->base[i]))
> > - return PTR_ERR(hw->base[i]);
> > - }
> > + hw->nbase = hw->soc->nbase_names;
> > + } else {
> > + for (get_base_pass = 0; get_base_pass < 2; get_base_pass++) {
> > + for (i = 0;; i++) {
> > + node = of_parse_phandle(np, "reg_bases", i);
> > + if (!node)
> > + break;
> > + if (get_base_pass == 1)
> > + hw->base[i] = of_iomap(node, 0);
> > + of_node_put(node);
> > + }
> >
> > - hw->nbase = hw->soc->nbase_names;
> > + if (i == 0)
> > + return -EINVAL;
> > + if (get_base_pass == 0) {
> > + hw->nbase = i;
> > + hw->base = devm_kmalloc_array(&pdev->dev, i,
> > + sizeof(*hw->base),
> > + GFP_KERNEL | __GFP_ZERO);
> > + if (IS_ERR(hw->base))
> > + return PTR_ERR(hw->base);
> > + }
> > + }
> > + }
> >
> > err = mtk_pctrl_build_state(pdev);
> > if (err) {
> > --
> > 1.8.1.1.dirty
> >


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