Commit 010e765b authored by Biju Das's avatar Biju Das Committed by Wolfram Sang
Browse files

i2c: riic: Add RZ/G2L support 



RZ/G2L i2c controller is compatible with RZ/A i2c controller.
By default IP is in reset state, so need to perform release
reset before accessing any register.

Signed-off-by: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarWolfram Sang <wsa@kernel.org>
parent a431a091

drivers/i2c/busses/i2c-riic.c

+22 −1
Original line number Diff line number Diff line
@@ -42,8 +42,10 @@ 
#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/reset.h>



#define RIIC_ICCR1	0x00

#define RIIC_ICCR2	0x04
@@ -86,6 +88,11 @@ 


#define RIIC_INIT_MSG	-1



enum riic_type {

	RIIC_RZ_A,

	RIIC_RZ_G2L,

};



struct riic_dev {

	void __iomem *base;

	u8 *buf;
@@ -395,7 +402,9 @@ static int riic_i2c_probe(struct platform_device *pdev) 
	struct i2c_adapter *adap;

	struct resource *res;

	struct i2c_timings i2c_t;

	struct reset_control *rstc;

	int i, ret;

	enum riic_type type;



	riic = devm_kzalloc(&pdev->dev, sizeof(*riic), GFP_KERNEL);

	if (!riic)
@@ -412,6 +421,17 @@ static int riic_i2c_probe(struct platform_device *pdev) 
		return PTR_ERR(riic->clk);

	}



	type = (enum riic_type)of_device_get_match_data(&pdev->dev);

	if (type == RIIC_RZ_G2L) {

		rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);

		if (IS_ERR(rstc)) {

			dev_err(&pdev->dev, "Error: missing reset ctrl\n");

			return PTR_ERR(rstc);

		}



		reset_control_deassert(rstc);

	}



	for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) {

		res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num);

		if (!res)
@@ -472,7 +492,8 @@ static int riic_i2c_remove(struct platform_device *pdev) 
}



static const struct of_device_id riic_i2c_dt_ids[] = {

	{ .compatible = "renesas,riic-rz" },

	{ .compatible = "renesas,riic-r9a07g044", .data = (void *)RIIC_RZ_G2L },

	{ .compatible = "renesas,riic-rz", .data = (void *)RIIC_RZ_A },

	{ /* Sentinel */ },

};