Existing Qualcomm SoCs have the LPASS pin controller slew rate control
in separate register, however this will change with upcoming Qualcomm
SoCs.  The slew rate will be part of the main register for pin
configuration, thus second device IO address space is not needed.

Prepare for supporting new SoCs by adding flag customizing the driver
behavior for slew rate.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes in v2:
1. Reversed xmas tree

v1: https://lore.kernel.org/all/20230901090224.27770-1-krzysztof.kozlowski@linaro.org/
---
 drivers/pinctrl/qcom/pinctrl-lpass-lpi.c | 20 ++++++++++++++------
 drivers/pinctrl/qcom/pinctrl-lpass-lpi.h |  7 +++++++
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
index 4fb808545f7f..9e410a281bfa 100644
--- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
+++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
@@ -191,6 +191,7 @@ static int lpi_config_set_slew_rate(struct lpi_pinctrl *pctrl,
 				    unsigned int group, unsigned int slew)
 {
 	unsigned long sval;
+	void __iomem *reg;
 	int slew_offset;
 
 	if (slew > LPI_SLEW_RATE_MAX) {
@@ -203,12 +204,17 @@ static int lpi_config_set_slew_rate(struct lpi_pinctrl *pctrl,
 	if (slew_offset == LPI_NO_SLEW)
 		return 0;
 
+	if (pctrl->data->flags & LPI_FLAG_SLEW_RATE_SAME_REG)
+		reg = pctrl->tlmm_base + LPI_TLMM_REG_OFFSET * group + LPI_GPIO_CFG_REG;
+	else
+		reg = pctrl->slew_base + LPI_SLEW_RATE_CTL_REG;
+
 	mutex_lock(&pctrl->lock);
 
-	sval = ioread32(pctrl->slew_base + LPI_SLEW_RATE_CTL_REG);
+	sval = ioread32(reg);
 	sval &= ~(LPI_SLEW_RATE_MASK << slew_offset);
 	sval |= slew << slew_offset;
-	iowrite32(sval, pctrl->slew_base + LPI_SLEW_RATE_CTL_REG);
+	iowrite32(sval, reg);
 
 	mutex_unlock(&pctrl->lock);
 
@@ -452,10 +458,12 @@ int lpi_pinctrl_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(pctrl->tlmm_base),
 				     "TLMM resource not provided\n");
 
-	pctrl->slew_base = devm_platform_ioremap_resource(pdev, 1);
-	if (IS_ERR(pctrl->slew_base))
-		return dev_err_probe(dev, PTR_ERR(pctrl->slew_base),
-				     "Slew resource not provided\n");
+	if (!(data->flags & LPI_FLAG_SLEW_RATE_SAME_REG)) {
+		pctrl->slew_base = devm_platform_ioremap_resource(pdev, 1);
+		if (IS_ERR(pctrl->slew_base))
+			return dev_err_probe(dev, PTR_ERR(pctrl->slew_base),
+					     "Slew resource not provided\n");
+	}
 
 	ret = devm_clk_bulk_get_optional(dev, MAX_LPI_NUM_CLKS, pctrl->clks);
 	if (ret)
diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
index 387d83ee95b5..206b2c0ca828 100644
--- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
+++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
@@ -60,6 +60,12 @@ struct pinctrl_pin_desc;
 		.nfuncs = 5,				\
 	}
 
+/*
+ * Slew rate control is done in the same register as rest of the
+ * pin configuration.
+ */
+#define LPI_FLAG_SLEW_RATE_SAME_REG			BIT(0)
+
 struct lpi_pingroup {
 	struct group_desc group;
 	unsigned int pin;
@@ -82,6 +88,7 @@ struct lpi_pinctrl_variant_data {
 	int ngroups;
 	const struct lpi_function *functions;
 	int nfunctions;
+	unsigned int flags;
 };
 
 int lpi_pinctrl_probe(struct platform_device *pdev);
-- 
2.34.1

On Fri, Oct 13, 2023 at 4:59 PM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:

> Existing Qualcomm SoCs have the LPASS pin controller slew rate control
> in separate register, however this will change with upcoming Qualcomm
> SoCs.  The slew rate will be part of the main register for pin
> configuration, thus second device IO address space is not needed.
>
> Prepare for supporting new SoCs by adding flag customizing the driver
> behavior for slew rate.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Patches applied.

Yours,
Linus Walleij

On 10/13/23 16:59, Krzysztof Kozlowski wrote:
> Existing Qualcomm SoCs have the LPASS pin controller slew rate control
> in separate register, however this will change with upcoming Qualcomm
> SoCs.  The slew rate will be part of the main register for pin
> configuration, thus second device IO address space is not needed.
> 
> Prepare for supporting new SoCs by adding flag customizing the driver
> behavior for slew rate.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> 
> ---
> 
> Changes in v2:
> 1. Reversed xmas tree
> 
> v1: https://lore.kernel.org/all/20230901090224.27770-1-krzysztof.kozlowski@linaro.org/
> ---
Only because I know it'll be used soon:

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>

Konrad