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Message-ID: <20180301155603.GE19122@bigcity.dyn.berto.se>
Date: Thu, 1 Mar 2018 16:56:03 +0100
From: Niklas Söderlund
<niklas.soderlund@...natech.se>
To: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
Kieran Bingham <kieran.bingham@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] media: i2c: adv748x: Add support for
i2c_new_secondary_device
Hi Kieran,
I like this change :-)
On 2018-02-27 15:05:50 +0000, Kieran Bingham wrote:
> From: Kieran Bingham <kieran.bingham@...asonboard.com>
>
> The ADV748x has twelve 256-byte maps that can be accessed via the main
> I2C ports. Each map has it own I2C address and acts as a standard slave
> device on the I2C bus.
>
> Allow a device tree node to override the default addresses so that
> address conflicts with other devices on the same bus may be resolved at
> the board description level.
>
> Signed-off-by: Kieran Bingham <kieran.bingham@...asonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> ---
> drivers/media/i2c/adv748x/adv748x-core.c | 77 +++++++++++++++-----------------
> drivers/media/i2c/adv748x/adv748x.h | 14 ------
> 2 files changed, 36 insertions(+), 55 deletions(-)
>
> diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
> index 9dcaadaca217..911ccf6eb68c 100644
> --- a/drivers/media/i2c/adv748x/adv748x-core.c
> +++ b/drivers/media/i2c/adv748x/adv748x-core.c
> @@ -80,21 +80,24 @@ static int adv748x_configure_regmap(struct adv748x_state *state, int region)
>
> return 0;
> }
> +struct adv748x_register_map {
> + const char *name;
> + u8 default_addr;
> +};
>
> -/* Default addresses for the I2C pages */
> -static int adv748x_i2c_addresses[ADV748X_PAGE_MAX] = {
> - ADV748X_I2C_IO,
> - ADV748X_I2C_DPLL,
> - ADV748X_I2C_CP,
> - ADV748X_I2C_HDMI,
> - ADV748X_I2C_EDID,
> - ADV748X_I2C_REPEATER,
> - ADV748X_I2C_INFOFRAME,
> - ADV748X_I2C_CBUS,
> - ADV748X_I2C_CEC,
> - ADV748X_I2C_SDP,
> - ADV748X_I2C_TXB,
> - ADV748X_I2C_TXA,
> +static const struct adv748x_register_map adv748x_default_addresses[] = {
> + [ADV748X_PAGE_IO] = { "main", 0x70 },
> + [ADV748X_PAGE_DPLL] = { "dpll", 0x26 },
> + [ADV748X_PAGE_CP] = { "cp", 0x22 },
> + [ADV748X_PAGE_HDMI] = { "hdmi", 0x34 },
> + [ADV748X_PAGE_EDID] = { "edid", 0x36 },
> + [ADV748X_PAGE_REPEATER] = { "repeater", 0x32 },
> + [ADV748X_PAGE_INFOFRAME] = { "infoframe", 0x31 },
> + [ADV748X_PAGE_CBUS] = { "cbus", 0x30 },
> + [ADV748X_PAGE_CEC] = { "cec", 0x41 },
> + [ADV748X_PAGE_SDP] = { "sdp", 0x79 },
> + [ADV748X_PAGE_TXB] = { "txb", 0x48 },
> + [ADV748X_PAGE_TXA] = { "txa", 0x4a },
> };
>
> static int adv748x_read_check(struct adv748x_state *state,
> @@ -143,15 +146,20 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
> return regmap_raw_write(regmap, init_reg, val, val_len);
> }
>
> -static struct i2c_client *adv748x_dummy_client(struct adv748x_state *state,
> - u8 addr, u8 io_reg)
> +static int adv748x_set_slave_addresses(struct adv748x_state *state)
> {
> - struct i2c_client *client = state->client;
> + struct i2c_client *client;
> + unsigned int i;
> + u8 io_reg;
> +
> + for (i = ADV748X_PAGE_DPLL; i < ADV748X_PAGE_MAX; ++i) {
> + io_reg = ADV748X_IO_SLAVE_ADDR_BASE + i;
> + client = state->i2c_clients[i];
>
> - if (addr)
> - io_write(state, io_reg, addr << 1);
> + io_write(state, io_reg, client->addr << 1);
> + }
>
> - return i2c_new_dummy(client->adapter, io_read(state, io_reg) >> 1);
> + return 0;
> }
>
> static void adv748x_unregister_clients(struct adv748x_state *state)
> @@ -164,13 +172,15 @@ static void adv748x_unregister_clients(struct adv748x_state *state)
>
> static int adv748x_initialise_clients(struct adv748x_state *state)
> {
> - int i;
> + unsigned int i;
> int ret;
>
> for (i = ADV748X_PAGE_DPLL; i < ADV748X_PAGE_MAX; ++i) {
> - state->i2c_clients[i] =
> - adv748x_dummy_client(state, adv748x_i2c_addresses[i],
> - ADV748X_IO_SLAVE_ADDR_BASE + i);
> + state->i2c_clients[i] = i2c_new_secondary_device(
> + state->client,
> + adv748x_default_addresses[i].name,
> + adv748x_default_addresses[i].default_addr);
> +
> if (state->i2c_clients[i] == NULL) {
> adv_err(state, "failed to create i2c client %u\n", i);
> return -ENOMEM;
> @@ -181,7 +191,7 @@ static int adv748x_initialise_clients(struct adv748x_state *state)
> return ret;
> }
>
> - return 0;
> + return adv748x_set_slave_addresses(state);
> }
>
> /**
> @@ -347,21 +357,6 @@ static const struct adv748x_reg_value adv748x_sw_reset[] = {
> {ADV748X_PAGE_EOR, 0xff, 0xff} /* End of register table */
> };
>
> -static const struct adv748x_reg_value adv748x_set_slave_address[] = {
> - {ADV748X_PAGE_IO, 0xf3, ADV748X_I2C_DPLL << 1},
> - {ADV748X_PAGE_IO, 0xf4, ADV748X_I2C_CP << 1},
> - {ADV748X_PAGE_IO, 0xf5, ADV748X_I2C_HDMI << 1},
> - {ADV748X_PAGE_IO, 0xf6, ADV748X_I2C_EDID << 1},
> - {ADV748X_PAGE_IO, 0xf7, ADV748X_I2C_REPEATER << 1},
> - {ADV748X_PAGE_IO, 0xf8, ADV748X_I2C_INFOFRAME << 1},
> - {ADV748X_PAGE_IO, 0xf9, ADV748X_I2C_CBUS << 1},
> - {ADV748X_PAGE_IO, 0xfa, ADV748X_I2C_CEC << 1},
> - {ADV748X_PAGE_IO, 0xfb, ADV748X_I2C_SDP << 1},
> - {ADV748X_PAGE_IO, 0xfc, ADV748X_I2C_TXB << 1},
> - {ADV748X_PAGE_IO, 0xfd, ADV748X_I2C_TXA << 1},
> - {ADV748X_PAGE_EOR, 0xff, 0xff} /* End of register table */
> -};
> -
> /* Supported Formats For Script Below */
> /* - 01-29 HDMI to MIPI TxA CSI 4-Lane - RGB888: */
> static const struct adv748x_reg_value adv748x_init_txa_4lane[] = {
> @@ -492,7 +487,7 @@ static int adv748x_reset(struct adv748x_state *state)
> if (ret < 0)
> return ret;
>
> - ret = adv748x_write_regs(state, adv748x_set_slave_address);
> + ret = adv748x_set_slave_addresses(state);
> if (ret < 0)
> return ret;
>
> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> index 725662edc4b8..65f83741277e 100644
> --- a/drivers/media/i2c/adv748x/adv748x.h
> +++ b/drivers/media/i2c/adv748x/adv748x.h
> @@ -27,20 +27,6 @@
> #ifndef _ADV748X_H_
> #define _ADV748X_H_
>
> -/* I2C slave addresses */
> -#define ADV748X_I2C_IO 0x70 /* IO Map */
> -#define ADV748X_I2C_DPLL 0x26 /* DPLL Map */
> -#define ADV748X_I2C_CP 0x22 /* CP Map */
> -#define ADV748X_I2C_HDMI 0x34 /* HDMI Map */
> -#define ADV748X_I2C_EDID 0x36 /* EDID Map */
> -#define ADV748X_I2C_REPEATER 0x32 /* HDMI RX Repeater Map */
> -#define ADV748X_I2C_INFOFRAME 0x31 /* HDMI RX InfoFrame Map */
> -#define ADV748X_I2C_CBUS 0x30 /* CBUS MHL Map */
> -#define ADV748X_I2C_CEC 0x41 /* CEC Map */
> -#define ADV748X_I2C_SDP 0x79 /* SDP Map */
> -#define ADV748X_I2C_TXB 0x48 /* CSI-TXB Map */
> -#define ADV748X_I2C_TXA 0x4a /* CSI-TXA Map */
> -
> enum adv748x_page {
> ADV748X_PAGE_IO,
> ADV748X_PAGE_DPLL,
> --
> 2.7.4
>
--
Regards,
Niklas Söderlund
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